Siemens 7SR17 Rho Manual

Motor protection relay

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7SR17 Rho

Motor Protection Relay

Answers for energy.

Reyrolle

Protection

Devices

Table of Contents

Chapters

Summary of Contents for Siemens 7SR17 Rho

Page 1 Reyrolle Protection Devices 7SR17 Rho Motor Protection Relay Answers for energy.
Page 3 7SR17 Rho Contents Contents Technical Manual Chapters 1. Description of Operation 2. Settings, Configuration & Instruments 3. Performance Specification 4. Data Communications 5. Installation 6. Commissioning and Maintenance 7. Applications Guide ©2013 Siemens Protection Devices Limited...
Page 5 Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.
Page 6 Chapter 1) 7SR17 Rho Description Of Operation This page is intentionally left blank Page 2 of 78 ©2014 Siemens Protection Devices Limited...
Page 7: Table Of Contents
Chapter 1) 7SR17 Rho Description Of Operation Contents Section 1: Introduction ........................9 Section 2: Hardware Description....................14 2.1 General ..........................14 2.2 Case ..........................14 2.3 Front Cover ........................15 2.4 Power Supply Unit (PSU) ....................15 2.5 Operator Interface/ Fascia ....................15 2.6 Current Inputs ........................
Page 8 Chapter 1) 7SR17 Rho Description Of Operation 4.7 Trip Circuit Supervision (74TCS) ..................63 4.8 Close Circuit Supervision (74CCS) ..................63 4.9 Circuit Breaker Failure (50BF) .................... 64 Section 5: Control & Logic Functions .................... 65 5.1 Motor Start/Stop ......................... 65 Emergency Start ........................
Page 9 Figure 6-1 Energy Direction Convention ..................73 List of Tables Table 1-1 Ordering Information – 7SR17 Rho Motor Protection ............. 10 Table 2-1 Summary of 7SR17 Rho Relay Configurations .............. 14 Table 3-1 Application of Thermal Time Constants ................. 25 Table 4-1 Determination of CT Failure ...................
Page 10 Chapter 1) 7SR17 Rho Description Of Operation Table 6-1 Operating Mode ......................75 Page 6 of 78 ©2014 Siemens Protection Devices Limited...
Page 11 Chapter 1) 7SR17 Rho Description Of Operation Symbols The following notational and formatting conventions are used within the remainder of this document: Setting Menu Location MAIN MENU>SUB-MENU Setting: Elem name -Setting Setting value: value Alternatives: [1st] [2nd] [3rd] ©2014 Siemens Protection Devices Limited...
Page 12 Chapter 1) 7SR17 Rho Description Of Operation Nomenclature Thermal state at time t Final thermal state before disconnection of motor Equivalent thermal current Gn 49 Thermal Overload setting In = Log Natural measured current Prior Steady state relay current Positive sequence current (I...
Page 13: Section 1: Introduction
Chapter 1) 7SR17 Rho Description Of Operation Section 1: Introduction This manual is applicable to the following relays: 7SR17 Motor Protection Relay The 7SR17 range of relays integrates the protection and control elements required to provide a complete thermal overload based protection for induction motor applications.
Page 14: Table 1-1 Ordering Information - 7Sr17 Rho Motor Protection
Chapter 1) 7SR17 Rho Description Of Operation Table 1-1 Ordering Information – 7SR17 Rho Motor Protection 7 S R 1 7 0 A 1 2 - | | | | | | Motor Protection | | | | | |...
Page 15: Figure 1-1-1 Functional Diagram Of 7Sr1702/3 Relay
Chapter 1) 7SR17 Rho Description Of Operation Figure 1-1-1 Functional Diagram of 7SR1702/3 Relay 46Ph (x2) (x2) (x2) (x2) (x2) (x2) (x2) (x2) (x2) (x2) (x2) (x2) (x2) (x3) NOTE: The use of functionality is dependent on external connections to the relay i.e. some functions are mutually exclusive...
Page 16: Figure 1-1-3 Connections Diagram For 7Sr1702/3 Relay
Chapter 1) 7SR17 Rho Description Of Operation BI 1 BI 4 BI 5 BI 2 Optional BI 3 BI 6 BO 6 BO 7 BO 8 Term. GND. BO 1 BO 2 BO 3 BO 4 BO 5 NOTES BI = Binary Input,...
Page 17: Figure 1-1-4 Connections Diagram For 7Sr1705/6 Relay
Chapter 1) 7SR17 Rho Description Of Operation BI 1 BI 4 BI 5 BI 2 Optional BI 3 BI 6 BO 6 BO 7 BO 8 Term. Relay Voltage Config. Setting GND. BO 1 BO 2 BO 3 BO 4...
Page 18: Section 2: Hardware Description
Chapter 1) 7SR17 Rho Description Of Operation Section 2: Hardware Description ENERAL The structure of the relay is based upon the 7SR1 hardware platform. The relays are supplied in size E4 cases. The hardware design provides commonality between products and components across the 7SR1 range of relays.
Page 19: Front Cover
Chapter 1) 7SR17 Rho Description Of Operation RONT OVER As standard the relay is supplied with a transparent front cover see Figure 2-2. The front cover is used to secure the relay assembly in the case. If access is required to view the menus without removing the cover, an alternative transparent cover with push buttons may be ordered.
Page 20 Chapter 1) 7SR17 Rho Description Of Operation The warning and information labels on the relay fascia provide the following information: The fascia is an integral part of the relay. Handles are located at each side of the element to allow it to be withdrawn from the relay case.
Page 21: Current Inputs
Chapter 1) 7SR17 Rho Description Of Operation ENTER Used to initiate and accept settings changes. CANCEL Used to cancel settings changes and/or move up the menu structure by one level per press. NOTE: All settings and configuration of LEDs, BI and BO can be accessed and set by the user using these keys.
Page 22: Binary Inputs
Chapter 1) 7SR17 Rho Description Of Operation INARY NPUTS The binary inputs are opto-couplers and can be operated from a suitably rated supply. The binary inputs are polarity conscious and will not operate if the DC supply polarity is reversed. For consistency and safety it is advised that AC connections for binary inputs are made with the Live connection to the +ve terminal and Neutral connection to –ve.
Page 23: Binary Outputs (Output Relays)
Chapter 1) 7SR17 Rho Description Of Operation INARY UTPUTS UTPUT ELAYS All outputs are fully user configurable and can be programmed to operate from any or all of the available functions. In the default mode of operation binary outputs are self reset and remain energised for a user configurable minimum operate time of up to 60 seconds.
Page 24: Figure 2-4 Binary Output Logic
Chapter 1) 7SR17 Rho Description Of Operation Figure 2-4 Binary Output Logic Page 20 of 78 ©2014 Siemens Protection Devices Limited...
Page 25: Virtual Input/Outputs
Chapter 1) 7SR17 Rho Description Of Operation 2.10 IRTUAL NPUT UTPUTS The relays have 8 virtual input/outputs, these are internal binary stores. By assigning the status of data items like starters, alarms, equations etc. to a virtual input/output, the status of these items can be used to fulfil higher levels of functionality.
Page 26: Figure 2-6 Unexpected Restarts Lockout Text
Chapter 1) 7SR17 Rho Description Of Operation The following screen-shot shows the events which are generated when the relay re-starts. The highlighted events show the cause of the re-start. The event which comes next shows the type of restart followed by the relay: Warm, Cold or Re-Start.
Page 27: Protection Healthy/Defective
Chapter 1) 7SR17 Rho Description Of Operation 2.11.1 Protection Healthy/Defective When the relay has an auxiliary DC supply and it has successfully passed its self-checking procedure then the front facia Protection Healthy LED is turned on. A changeover or open contact can be mapped via the binary output matrix to provide an external protection healthy signal.
Page 28: Figure 2-8 7Sr17 Menu Structure
Chapter 1) 7SR17 Rho Description Of Operation 7SR17_ Rho ________________________ ENTER to CONTROL CONTROL MODE SETTINGS DISPLAY MODE INSTRUMENTS MODE FAULT DATA MODE SYSTEM CONFIGURATION FAVOURITE METERS FAULT 10 MOTOR CONFIGURATION CURRENT METERS CT/VT CONFIGURATION VOLTAGE METERS FAULT 1 FREQUENCY METERS...
Page 29: Section 3: Protection Functions
Chapter 1) 7SR17 Rho Description Of Operation Section 3: Protection Functions HERMAL ROTECTION To prevent overheating of the motor thermal overload protection is used to remove the motor supply when a nominated thermal state ( ) is reached. The thermal overload function uses measured 3-phase true RMS current to estimate the thermal state of the motor.
Page 30 Chapter 1) 7SR17 Rho Description Of Operation The final steady state thermal condition can be predicted for any steady state value of input current: where t >> , 100% The Hot/Cold ratio setting determines the percentage of thermal capacity available for a motor running at thermal equilibrium compared to that available when the motor is cold.
Page 31: Thermal Protection: Overload (49)
Chapter 1) 7SR17 Rho Description Of Operation 3.1.1 Thermal Protection: Overload (49) Where Gn 49 NPS Weighting setting is selected to ‘Average’ the thermal protection uses the average of the three RMS phase currents. Where Gn 49 NPS Weighting setting is selected to ‘Seq Comp’ the relay calculates the positive and negative phase sequence components from the three phase currents.
Page 32: Figure 3-2 Logic Diagram: Motor Thermal Overload Protection (49)
Chapter 1) 7SR17 Rho Description Of Operation Gn 49 Char (Thermal Characteristic) The IEC thermal characteristic of the Rho conforms to IEC60255-8 (Thermal Electrical Relays). A user definable thermal curve is available to allow matching of the relay thermal characteristic to all motor and cooling system types.
Page 33: Figure 3.1-3 Application Of Thermal Overload Time Constants
Chapter 1) 7SR17 Rho Description Of Operation Gn 49 Hot/Cold Ratio The hot/cold ratio setting determines the percentage of thermal capacity available for a motor running at full load current compared to that available when the motor is cold. It modifies the IEC255-8 hot curve as below: Where;...
Page 34 Chapter 1) 7SR17 Rho Description Of Operation Gn 49 Restart Inhibit Mode The restart inhibit feature can be assigned to an output contact which can be used to prevent the motor from being started until sufficient thermal capacity is available. A normally closed contact can be connected in the motor starting circuit, thus breaking the circuit when the restart inhibit feature registers thermal state available.
Page 35: Thermal Protection: Stall Protection (14)
Chapter 1) 7SR17 Rho Description Of Operation 3.1.2 Thermal Protection: Stall Protection (14) Stall protection can be applied where the thermal characteristic does not offer sufficient protection against stalling during running or during a locked rotor condition on starting. Pick up is initiated when any phase current is above Gn 14-n Setting Gn 14-n Delay is initiated when the measured current exceeds the Gn 14-n Setting The time delayed overcurrent elements are enabled for the following ‘Control’...
Page 36: Thermal Protection: Start Protection (48, 66)
Chapter 1) 7SR17 Rho Description Of Operation 3.1.3 Thermal Protection: Start Protection (48, 66) A motor start is detected as described in section 3.1. 3.1.3.1 Number of Starts (66) This feature is used where plant or motor operational constraints are to be considered or to ensure that permitted winding temperatures are not exceeded.
Page 37: Figure 3-6 Start Time Supervision (48)
Chapter 1) 7SR17 Rho Description Of Operation 3.1.3.2 Start Time Supervision (48) An output can be provided where the motor start time is too long i.e. where the start time exceeds the Gn 48-n Delay setting. Figure 3-6 Start Time Supervision (48) ©2014 Siemens Protection Devices Limited...
Page 38: Thermal Protection: Phase Unbalance (46)
Chapter 1) 7SR17 Rho Description Of Operation 3.1.4 Thermal Protection: Phase Unbalance (46) This provides separate protection for the conditions of phase unbalance, loss of phase and reverse phase sequence. When enabled this feature can be programmed to operate either as a magnitude difference protection or as a negative phase sequence (NPS) overcurrent protection.
Page 39: Figure 3-8 Logic Diagram : Nps Phase Unbalance (46Nps)
Chapter 1) 7SR17 Rho Description Of Operation 3.1.4.1 Negative Phase Sequence If negative phase sequence (NPS) protection is the selected method of phase unbalance protection then the NPS component derived from the three phase input currents is used. The operate equation for inverse time characteristic shown in Figure 3-7 is implemented as:...
Page 40: Figure 3-9 Logic Diagram: Phase Difference Phase Unbalance (46Pd)
Chapter 1) 7SR17 Rho Description Of Operation 3.1.4.2 Magnitude Difference Protection If magnitude difference protection is selected as the method of phase unbalance protection the relay calculates the magnitude difference relative to the thermal overload setting as follows: Percentage Unbalance The operate equation for inverse time characteristic shown in Figure 3-7 is implemented as: Gn 46 Type = Mag.
Page 41: Current Protection: Undercurrent (37)
Chapter 1) 7SR17 Rho Description Of Operation (37) URRENT ROTECTION NDERCURRENT Two rms measuring under-current elements are provided. Each phase has an independent level detector and current-timing element. Gn 37-n Setting sets the pick-up current. An output is given after elapse of the Gn 37-n Delay setting.
Page 42: Current Protection: Phase Overcurrent (67, 51, 50)
Chapter 1) 7SR17 Rho Description Of Operation (67, 51, 50) URRENT ROTECTION HASE VERCURRENT All phase overcurrent elements have a common setting for the 50 elements and 51 elements to measure either fundamental frequency RMS or True RMS current: True RMS current: Gn 50 Measurement = RMS, Gn 51 Measurement = RMS...
Page 43: Overcurrent Protection (50)
Chapter 1) 7SR17 Rho Description Of Operation 3.3.2 Overcurrent Protection (50) Each instantaneous element (50-n) has independent settings. 50-n Setting for pick-up current and 50-n Delay follower time delay. The instantaneous elements have transient free operation. Where directional elements are present the direction of operation can be set using 50-n Dir. Control setting.
Page 44: Time Delayed Overcurrent Protection (51)
Chapter 1) 7SR17 Rho Description Of Operation 3.3.3 Time Delayed Overcurrent Protection (51) Where voltage inputs are fitted the time delayed overcurrent protection can be directionally controlled. All phase overcurrent elements have a common setting to measure either fundamental frequency RMS or True...
Page 45: Figure 3-12 Logic Diagram: Time Delayed Overcurrent Element
Chapter 1) 7SR17 Rho Description Of Operation Figure 3-12 Logic Diagram: Time Delayed Overcurrent Element ©2014 Siemens Protection Devices Limited Page 41 of 78...
Page 46: Current Protection: Measured Earth Fault (50/51G)
Chapter 1) 7SR17 Rho Description Of Operation (50/51G) URRENT ROTECTION EASURED ARTH AULT The earth current is measured directly via a dedicated current analogue input, I All measured earth fault elements have a common setting to measure either fundamental frequency RMS or True...
Page 47: Measured Earth Fault Protection (50G)
Chapter 1) 7SR17 Rho Description Of Operation 3.4.2 Measured Earth Fault Protection (50G) Each instantaneous element has independent settings for pick-up current 50G-n Setting and a follower time delay 50G-n Delay. The instantaneous elements have transient free operation. Operation of the instantaneous measured earth fault elements can be inhibited from:...
Page 48: Time Delayed Measured Earth Fault Protection (51G)
Chapter 1) 7SR17 Rho Description Of Operation 3.4.3 Time Delayed Measured Earth Fault Protection (51G) 51G-n Setting sets the pick-up current level. A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is selected from IEC, ANSI or user specific curves using 51G-n Char. A time multiplier is applied to the characteristic curves using the 51G-n Time Mult setting.
Page 49: Current Protection: Derived Earth Fault (50/51N)
Chapter 1) 7SR17 Rho Description Of Operation (50/51N) URRENT ROTECTION ERIVED ARTH AULT The earth current is derived by calculating the sum of the measured line currents. The elements measure the fundamental frequency RMS current. 3.5.1 Directional Control of Derived Earth Fault Protection (67N) – 7SR1705/6 The directional element produces forward and reverse outputs for use with derived earth fault elements.
Page 50: Derived Earth Fault Protection (50N)
Chapter 1) 7SR17 Rho Description Of Operation 3.5.2 Derived Earth Fault Protection (50N) Each instantaneous element has independent settings for pick-up current 50N-n Setting and a follower time delay 50N-n Delay. The instantaneous elements have transient free operation. Operation of the instantaneous earth fault elements can be inhibited from:...
Page 51: Time Delayed Derived Earth Fault Protection (51N)
Chapter 1) 7SR17 Rho Description Of Operation 3.5.3 Time Delayed Derived Earth Fault Protection (51N) 51N-n Setting sets the pick-up current level. A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is selected from IEC, ANSI or user specific curves using 51N-n Char. A time multiplier is applied to the characteristic curves using the 51N-n Time Mult setting.
Page 52: Current Protection: High Impedance Restricted Earth Fault (87Ref)
Chapter 1) 7SR17 Rho Description Of Operation (87REF) URRENT ROTECTION MPEDANCE ESTRICTED ARTH AULT One high impedance Restricted Earth Fault (REF) element is provided. The relay utilises fundamental current measurement values for this function. The single phase current input is derived from the residual output of line/neutral CTs connected in parallel. An external stabilising resistor must be connected in series with this input to ensure that this element provides a high impedance path.
Page 53: Voltage Protection: Under/Over Voltage - 7Sr1705/6
Chapter 1) 7SR17 Rho Description Of Operation - 7SR1705/6 OLTAGE ROTECTION NDER OLTAGE 3.7.1 Phase Under/Over Voltage (27/59) Time delayed voltage protection can be used to indicate high or low voltage levels and the duration of the voltage excursion. The relay utilises fundamental frequency RMS voltage for this function. All under/over voltage elements have a common setting to measure phase to phase (Ph-Ph) or phase to neutral (Ph-N) voltage using the Voltage Input Mode setting.
Page 54: Voltage Protection: Nps Overvoltage (47) - 7Sr1705/6
Chapter 1) 7SR17 Rho Description Of Operation : NPS O (47) - 7SR1705/6 OLTAGE ROTECTION VERVOLTAGE Negative phase sequence (NPS) voltage (V2) is a measure of the quantity of unbalanced voltage in the system. The relay derives the NPS voltage from the three input voltages (VL1, VL2 and VL3).
Page 55: Voltage Protection: Under/Over Frequency (81) - 7Sr1705/6
Chapter 1) 7SR17 Rho Description Of Operation (81) - 7SR1705/6 OLTAGE ROTECTION NDER REQUENCY Two under/over frequency elements are provided The frequency calculation is based on the highest input voltage derived from the voltage selection algorithm. Frequency elements are blocked if all phase voltages fall below the 81 U/V Guard setting.
Page 56: Power Protection - 7Sr1705/6
Chapter 1) 7SR17 Rho Description Of Operation 3.10 - 7SR1705/6 OWER ROTECTION 3.10.1 Power Protection - 32 Two under/over power elements are provided and can measure real, reactive or apparent power. Gn 32-n Setting sets the pick-up power level for the element.
Page 57: Sensitive Power Protection - 32S
Chapter 1) 7SR17 Rho Description Of Operation 3.10.2 Sensitive Power Protection – 32S Two under/over sensitive power elements are provided and can measure real, reactive or apparent power. Sensitive power functionality utilises the I current input i.e. a single CT input is used. Balanced load conditions are assumed.
Page 58: Power Factor - 55
Chapter 1) 7SR17 Rho Description Of Operation 3.10.3 Power Factor – 55 Two power factor elements are provided. Gn 55-n Setting sets the pick-up power factor of the element. Under-power factor or over-power factor operation can be set by the Gn 55-n Operation setting.
Page 59: Section 4: Supervision Functions
Chapter 1) 7SR17 Rho Description Of Operation Section 4: Supervision Functions 4.1 B (50BCL) REAK APACITY IMIT An MCCB motor trip or contactor release should not be attempted if the short circuit current exceeds the set Breaking Capacity Limit. The Breaking Capacity Limit setting is provided to prevent the current interrupting capability of the primary switching device being exceeded.
Page 60: Anti-Backspin (81B)
Chapter 1) 7SR17 Rho Description Of Operation (81B) ACKSPIN Anti-backspin is used to inhibit restarting of the motor until after the rotor has completely stopped. The function must be used in conjunction with an auxiliary switch of the motor control device which is used to indicate the open status of the motor controller.
Page 61: Phase Reversal (46 Ph Rev)
Chapter 1) 7SR17 Rho Description Of Operation (46 PH REV) HASE EVERSAL Gn 46 PH REV Setting is the ratio of NPS:PPS current. A high value indicates incorrect current phase rotation. This can be used to prevent inadvertent reverse operation of the motor.
Page 62: Resistance Temperature Detector Inputs (Rtds)
Chapter 1) 7SR17 Rho Description Of Operation (RTD ESISTANCE EMPERATURE ETECTOR NPUTS Up to twelve Pt100 Temperature Sensors can be connected to the external (optional) 7XV5662-6AD10 temperature monitoring interface (TMI). The TMI is connected to the relay COM1-RS485 comms port, this comms port is selected to ZIEHL-TR1200.
Page 63: Ct Supervision (60Cts)
Chapter 1) 7SR17 Rho Description Of Operation CT S (60CTS) UPERVISION The relay has two methods of detecting a CT failure, depending on the relay model. 4.5.1 60CTS - 7SR1702/3 The current from each of the Phase Current Transformers is monitored. If one or two of the three input currents falls below the CT supervision current setting Gn 60CTS-I for more than Gn 60CTS-I Delay then a CT failure output 60CTS-I is given.
Page 64: 60Cts - 7Sr1705/6
Chapter 1) 7SR17 Rho Description Of Operation 4.5.2 60CTS - 7SR1705/6 Normally the presence of negative phase sequence (NPS) current in a power system is accompanied by NPS voltage. The presence of NPS current without NPS voltage is used to indicate a current transformer failure.
Page 65: Voltage Transformer Supervision (60Vts) - 7Sr1705/6
Chapter 1) 7SR17 Rho Description Of Operation (60VTS) – 7SR1705/6 OLTAGE RANSFORMER UPERVISION 1 or 2 Phase Failure Detection Normally the presence of negative phase sequence (NPS) or zero phase sequence (ZPS) voltage in a power system is accompanied by NPS or ZPS current. The presence of either of these sequence voltages without the equivalent level of the appropriate sequence current is used to indicate a failure of one or two VT phases.
Page 66: Figure 4-7 Logic Diagram: Vt Supervision Function (60Vts)
Chapter 1) 7SR17 Rho Description Of Operation Figure 4-7 Logic Diagram: VT Supervision Function (60VTS) Page 62 of 78 ©2014 Siemens Protection Devices Limited...
Page 67: Figure 4-8 Logic Diagram: Trip Circuit Supervision Feature (74Tcs)
Chapter 1) 7SR17 Rho Description Of Operation (74TCS) IRCUIT UPERVISION The relay provides three Trip Circuit Supervision elements. One or more binary inputs can be mapped to Gn 74TCS-n. The inputs are connected into the trip circuit such that at least one input is energised when the trip circuit wiring is intact. If all mapped inputs become de-energised, due to a break in the trip circuit wiring or loss of supply an output is given.
Page 68: Figure 4-10 Logic Diagram: Circuit Breaker Fail Protection (50Bf)
Chapter 1) 7SR17 Rho Description Of Operation (50BF) IRCUIT REAKER AILURE The circuit breaker fail function has two time delayed outputs that can be used for combinations of re-tripping or back-tripping. CB Fail outputs are given after elapse of the 50BF-1 Delay or 50BF-2 Delay settings.
Page 69 Chapter 1) 7SR17 Rho Description Of Operation Section 5: Control & Logic Functions OTOR TART Settings are included for CB monitoring and CB control i.e. motor stop/start. Motor start and stop commands can be initiated in one of three ways: via a binary input, via the data communication Channel(s) or from the relay CONTROL MODE menu.
Page 70: Figure 5-1 Logic Diagram: Circuit Breaker Status
Chapter 1) 7SR17 Rho Description Of Operation Gn CB Travel Alarm The CB Open/CB Closed binary inputs are continually monitored to track the motor control device Status. The controller should only ever be in 3 states: CB Status CB Open...
Page 71: Figure 5-2 Logic Diagram: Motor Control
Chapter 1) 7SR17 Rho Description Of Operation Figure 5-2 Logic Diagram: Motor Control ©2014 Siemens Protection Devices Limited Page 67 of 78...
Page 72: Figure 5-3 Sequence Diagram: Quick Logic Pu/Do Timers (Counter Reset Mode Off)
Chapter 1) 7SR17 Rho Description Of Operation OGIC 5.2.1 Quick Logic The ‘Quick Logic’ feature allows the user to input up to 4 logic equations (E1 to E4) in text format. Equations can be entered using Reydisp or at the relay fascia.
Page 73 Chapter 1) 7SR17 Rho Description Of Operation When the count value = En Counter Target the output of the counter (En) = 1 and this value is held until the initiating conditions are removed when En is instantaneously reset. The output of En is assigned in the OUTPUT CONFIG>OUTPUT MATRIX menu where it can be programmed to any binary output (O), LED (L) or Virtual Input/Output (V) combination.
Page 74 Chapter 1) 7SR17 Rho Description Of Operation Section 6: Other Features OMMUNICATIONS Two communication ports, COM1 and COM2 are provided. RS485 connections are available on the terminal blocks at the rear of the relay (COM1). A USB port, (COM 2), is provided at the front of the relay for local access using a PC.
Page 75 Chapter 1) 7SR17 Rho Description Of Operation TORAGE 6.3.1 General The relay stores three types of data records: relay event records, analogue/digital waveform records and fault records. Data records are backed up in non-volatile memory and are permanently stored even in the event of loss of auxiliary d.c.
Page 76 Chapter 1) 7SR17 Rho Description Of Operation Fault records are stored in a rolling buffer, with the oldest faults overwritten. The fault storage can be cleared with the DATA STORAGE>Clear Faults setting. 6.3.5 Demand/Data Log Records Maximum, minimum and mean values of input currents, voltages and power (where applicable) are available as instruments which can be read in the relay INSTRUMENTS MENU or via Reydisp.
Page 77: Figure 6-1 Energy Direction Convention
Chapter 1) 7SR17 Rho Description Of Operation NSTRUMENTS Real-time data is available from the relay fascia in the ‘Instruments Mode’ or via the data communications interface. The Primary values are calculated using the VT ratios set in the CT/VT Config menu.
Page 78 Chapter 1) 7SR17 Rho Description Of Operation Setting either the Export Power (W) or Lag VAr (VAr) to be -ve, will reverse the Direction of the Energy transfer for these quantities. So forward VAr will then be reported as Imported Reactive Energy, and forward Watts will be reported as Exported Active Energy.
Page 79 Chapter 1) 7SR17 Rho Description Of Operation PERATING The relay has three operating modes, Local, Remote and Out of Service. The following table identifies the functions operation in each mode. The modes can be selected by the following methods: SYSTEM CONFIG>OPERATING MODE setting, a Binary...
Page 80 Chapter 1) 7SR17 Rho Description Of Operation LOCK Time and date can be set either via the relay fascia using appropriate commands in the System Config menu, via the data comms channel(s) or via the optional IRIG-B input. Time and date are maintained while the relay is de- energised by a back up storage capacitor.
Page 81 The password validation screen also displays a numerical code. If the password is lost or forgotten, this code should be communicated to Siemens Protection Devices Ltd. and the password can be retrieved. ©2014 Siemens Protection Devices Limited Page 77 of 78...
Page 83 Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.
Page 85 Figure 2.1-1 USB connection to PC ........................18 Figure 2.1-2 RS485 connection to PC ....................... 18 Figure 2.1-3 PC Comm Port Selection ......................20 Figure 2.1-4 PC Language File Editor ....................... 21 ©2014 Siemens Protection Devices Limited Chapter 2) Page 3 of 22...
Page 87: Section 1: Introduction
To change the contrast on the LCD insert a flat bladed screwdriver into the screw head below the contrast symbol, turning the screw head left (anti-clockwise) lightens the contrast of the LCD and turning it right (clockwise) darkens the display. Figure 1.1-2 Fascia Contrast symbol ©2014 Siemens Protection Devices Limited Chapter 2) Page 5 of 22...
Page 88 Chapter 2) 7SR17Rho Settings & Instruments Figure 1.1-3 Fascia of 7SR17 relay Chapter 2) Page 6 of 22 ©2014 Siemens Protection Devices Limited...
Page 89: Operation Guide
LEDs will momentarily light up to indicate their correct operation. It also moves the cursor right when navigating through menus and settings. ©2014 Siemens Protection Devices Limited Chapter 2) Page 7 of 22...
Page 90 OUTPUT MATRIX OUTPUT CONFIGURATION BINARY OUTPUT CONFIG LED CONFIG PICKUP CONFIG TRIP CONFIG MAINTENANCE DATA STORAGE DEMAND DATA LOG WAVEFORM STORAGE COMMUNICATIONS FAULT STORAGE ENERGY STORAGE Figure 1.2-2 Menu Structure Chapter 2) Page 8 of 22 ©2014 Siemens Protection Devices Limited...
Page 91: Setting Mode
Once editing is complete pressing the ENTER button stores the new setting into the non-volatile memory. The actual setting ranges and default values for each relay model can be found in the appendix to this manual. ©2014 Siemens Protection Devices Limited Chapter 2) Page 9 of 22...
Page 92: Instruments Mode
0.00xIn---- 0.00xIn---- I Seq Components Displays the Current Sequence components Nominal RMS values & phase angles with respect to PPS voltage. Izps 0.00xIn---- Ipps 0.00xIn---- Inps 0.00xIn---- I Eq. Chapter 2) Page 10 of 22 ©2014 Siemens Protection Devices Limited...
Page 93 Displays the Phase to Neutral Voltage Secondary RMS values & Angles with respect to PPS voltage. 0.00V 0.00V 0.00V Nom Ph-N Voltage Displays the Phase to Neutral Voltage Nominal RMS values 0.00Vn--- ©2014 Siemens Protection Devices Limited Chapter 2) Page 11 of 22...
Page 94 Motor Data FLC, Motor Load, Time Running, Rated O/P power, PF, Efficiency, Service Factor, Hot Stall Time, Cold Stall Time, Locked Rotor Current, Start Time, Start Method, Vacuum CB. Chapter 2) Page 12 of 22 ©2014 Siemens Protection Devices Limited...
Page 95 TEST/RESET allows access to this sub-group Displays both imported and exported Active Energy Active Energy 0.00MWh 0.00MWh Displays both imported and exported Reactive Energy Reactive Energy 0.00MVArh 0.00MVArh ©2014 Siemens Protection Devices Limited Chapter 2) Page 13 of 22...
Page 96 Displays the state of General Alarm General Alarms ALARM 1 Cleared General Alarms ALARM 2 Cleared General Alarms ALARM 3 Cleared General Alarms ALARM 4 Cleared General Alarms ALARM 5 Cleared Chapter 2) Page 14 of 22 ©2014 Siemens Protection Devices Limited...
Page 97 0.00V Mean 0.00V Displays the Active Power demand. Power P 3P Demand 0.00W 0.00W Mean 0.00W Displays the Reactive Power demand. Power Q 3P Demand 0.00VAr 0.00VAr Mean 0.00VAr ©2014 Siemens Protection Devices Limited Chapter 2) Page 15 of 22...
Page 98 TEST/RESET allows access to this sub-group Displays the state of Virtual Outputs 1 to 8 (The number of virtual V 1-8 ---- ---- inputs will vary depending on model) Chapter 2) Page 16 of 22 ©2014 Siemens Protection Devices Limited...
Page 99: Fault Data Mode
Each record contains data on the operated elements, analogue values and LED flag states at the time of the fault. The data is viewed by scrolling down using the button. ©2014 Siemens Protection Devices Limited Chapter 2) Page 17 of 22...
Page 100: Section 2: Setting & Configuring The Relay Using Reydisp Evolution
Front USB connection To connect your pc locally via the front USB port. Figure 2.1-1 USB connection to PC 2.1.2 Rear RS485 connection Figure 2.1-2 RS485 connection to PC Chapter 2) Page 18 of 22 ©2014 Siemens Protection Devices Limited...
Page 101: Configuring Relay Data Communication
DNP3 Destination Address when DNP3 Unsolicited The address of the master to which unsolicited Events is Enabled events will be sent. 5, 6 ... 299, 300 DNP3 Application Timeout ©2014 Siemens Protection Devices Limited Chapter 2) Page 19 of 22...
Page 102: Connecting To The Relay For Setting Via Reydisp Evolution
Reydisp Manager provides the functionality of Reydisp Evolution and also provides access to user logic within the relay via an easy to use graphical interface. For full details refer to the ‘Reydisp Manager Use Guide’. Chapter 2) Page 20 of 22 ©2014 Siemens Protection Devices Limited...
Page 103: Configuring The User Texts Using Reydisp Language Editor
Care should be taken to ensure a unique file name is given including a version control reference. The user will be prompted to restart the relay to activate the language file. Please refer to the Language Editor Manual for further guidance. ©2014 Siemens Protection Devices Limited Chapter 2) Page 21 of 22...
Page 105 Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.
Page 106 Chapter 3) 7SR17 Rho Performance Specification This page is intentionally left blank Chapter 3) Page 2 of 46 ©2014 Siemens Protection Devices Limited...
Page 107 Chapter 3) 7SR17 Rho Performance Specification Contents Section 1: Common Functions ......................7 1.1.1 CE Conformity ......................7 1.1.2 Reference ........................ 7 1.1.3 Dimensions ......................7 1.1.4 Weights ........................7 1.2 Energising Quantities ......................8 1.2.1 Auxiliary Power Supply .................... 8 1.2.2...
Page 108 Chapter 3) 7SR17 Rho Performance Specification 2.9 50 Overcurrent ........................29 2.9.1 Reference ......................29 2.9.2 Operate and Reset Level ..................29 2.9.3 Operate and Reset Time ..................29 2.10 50G Measured Earth Fault ....................30 2.10.1 Reference ......................30 2.10.2 Operate and Reset Level ..................
Page 109 Chapter 3) 7SR17 Rho Performance Specification 3.5.3 Operate and Reset Time ..................45 3.6 74T/CCS Trip/Close Circuit Supervision ................46 3.6.1 Reference ......................46 3.6.2 Operate and Reset Time ..................46 List of Figures Figure 1.2-1 Binary Input Configurations Providing Compliance with EATS 48-4 Classes ESI 1 and ESI 2 ......................
Page 110 Chapter 3) 7SR17 Rho Performance Specification Chapter 3) Page 6 of 46 ©2014 Siemens Protection Devices Limited...
Page 111: Section 1: Common Functions
Chapter 3) 7SR17 Rho Performance Specification Section 1: Common Functions 1.1.1 CE Conformity This product is CE compliant to relevant EU directives. 1.1.2 Reference This product complies with IEC 60255-3 and IEC 60255-6. 1.1.2.1 Accuracy Reference Conditions This product has been tested under the following conditions, unless specifically stated otherwise.
Page 112: Energising Quantities
Chapter 3) 7SR17 Rho Performance Specification Energising Quantities 1.2.1 Auxiliary Power Supply IEC60255-11 & EATS 48-4 Nominal Operating Range Absolute Range* Comments Low voltage PSU suitable for 24VDC, 24 to 60 VDC 18 to 72 VDC 30VDC,48VDC and 60VDC systems...
Page 113: Ac Analogue Current
Chapter 3) 7SR17 Rho Performance Specification Operational Features 1.2.1.2 Attribute Value Comments 0% Dip Withstand Period 50ms Typical time after switch on to Dip Immunity Acquisition Period 5minutes attain claimed immunity to dips NOTE: Dips in supply that fall below the minimum voltage for a period greater than the 0% Dip With stand Period will invoke a relay reset.
Page 114: Ac Analogue Voltage
Chapter 3) 7SR17 Rho Performance Specification 1.2.3 AC Analogue Voltage Attribute Nominal Operating Range 40 to 160 Vrms 0 to 200 Vrms 50, 60Hz 47.5 to 52.5Hz and 57 to 63Hz 1.2.3.1 Burden Attribute Value AC Burden 0.02 VA @ 63.5 V , 0.06 VA @ 110 Vrms...
Page 115: Binary (Digital) Inputs
Chapter 3) 7SR17 Rho Performance Specification 1.2.5 Binary (Digital) Inputs DC operation EATS48-4 Nominal Operating Range 19 VDC 17 to 320 VDC 88 VDC 74 to 320 VDC AC operation Nominal Operating Range 19 VDC 92 to 138 V DC Performance 1.2.5.1...
Page 116 Chapter 3) 7SR17 Rho Performance Specification Figure 1.2-1 Binary Input Configurations Providing Compliance with EATS 48-4 Classes ESI 1 and ESI 2 Chapter 3) Page 12 of 46 ©2014 Siemens Protection Devices Limited...
Page 117: Functional Performance
Chapter 3) 7SR17 Rho Performance Specification Functional performance 1.3.1 Instrumentation Instrument Value Reference Typical accuracy Current 0.1 x In 1 % In or ± 5 mA Voltage 0.8 x Vn 1 % Vn W, Var, VA Power, real and apparent V = Vn, I 0.1 x In, pf...
Page 118: Environmental Performance
Chapter 3) 7SR17 Rho Performance Specification Environmental Performance 1.4.1 General Temperature 1.4.1.1 IEC 60068-2-1/2 Type Level Operating range -10 C to +55 C Storage range -25 C to +70 C Humidity 1.4.1.2 IEC 60068-2-78 Type Level Operational test 56 days at 40 C and 93 % relative humidity Transient Overvoltage 1.4.1.3...
Page 119: Emissions
Chapter 3) 7SR17 Rho Performance Specification 1.4.2 Emissions IEC 60255-25 Radiated Radio Frequency 1.4.2.1 Type Limits at 10 m, Quasi-peak 30 to 230 MHz 40 dB( V/m) 230 to 1000 MHz 47 dB( V/m) Conducted Radio Frequency 1.4.2.2 Limits Type...
Page 120: Immunity
Chapter 3) 7SR17 Rho Performance Specification 1.4.3 Immunity Auxiliary Supply Variation 1.4.3.1 IEC 60255-11 Test Type of Phenomena Duration Declared Operation Specifications 50ms 0% RV Normal Operation (Claimed) Voltage Dips Normal operation except where Dip falls below 40% RV 200ms...
Page 121 Chapter 3) 7SR17 Rho Performance Specification High Frequency Disturbance 1.4.3.2 IEC 60255-22-1 Type Level Variation Case, Aux Power & I/O common (longitudinal) mode 2.5 kV 10 % Case, Aux Power & I/O Series (transverse) mode 1.0 kV RS485 Metallic Comms 1.0kV...
Page 122: Mechanical
Chapter 3) 7SR17 Rho Performance Specification Magnetic Field with Power Frequency 1.4.3.8 IEC 61000-4-8 Level 5 100A/m, (0.126mT) continuous 50Hz 1000A/m, (1.26mT) for 3s 1.4.4 Mechanical Vibration (Sinusoidal) 1.4.4.1 IEC 60255-21-1 Class I Type Level Variation Vibration response 0.5 gn Vibration endurance 1.0 gn...
Page 123: Section 2: Protection Functions
Chapter 3) 7SR17 Rho Performance Specification Section 2: Protection Functions 14 Stall 2.1.1 Reference Parameter Value 14-n Setting 0.05 … 10 x In Applied Current (for operate time) 2 to 5 x Is 14-n Delay 0.00 … 14400 s 2.1.2...
Page 124: 27/59 Phase Under/Over Voltage
Chapter 3) 7SR17 Rho Performance Specification 27/59 Phase Under/over voltage 2.2.1 Reference Parameter Value 27/59-n Setting 5…200V hyst 27/59-n Hysteresis setting 0, 0.1… 80.0% 27/59-n Delay setting 0.00 … 14400 s 2.2.2 Operate and Reset Level Attribute Value Operate level 100 % Vs, 1 % or 0.25V...
Page 125: Power
Chapter 3) 7SR17 Rho Performance Specification 32 Power 2.3.1 Reference Parameter Value 32-n Setting 0.05…2 x Sn 32-n Delay setting 0.00 … 14400 s 2.3.2 Operate and Reset Level Attribute Value Operate level 100 % Ss, 5% or 2% Sn...
Page 126: Sensitive Power
Chapter 3) 7SR17 Rho Performance Specification 32S Sensitive Power 2.4.1 Reference Parameter Value 32S-n Setting 0.005…2 x Sn 32S-n Delay setting 0.00 … 14400 s 2.4.2 Operate and Reset Level Attribute Value Operate level 100 % Ss, 5% or 2% Sn...
Page 127: Undercurrent
Chapter 3) 7SR17 Rho Performance Specification 37 Undercurrent 2.5.1 Reference Parameter Value 37-n Setting 0.05 …5.0 x In 37-n Delay setting 0.00 … 14400 s 2.5.2 Operate and Reset Level Attribute Value Operate level 100 % Is, 5 % or...
Page 128: Phase Unbalance Protection
Chapter 3) 7SR17 Rho Performance Specification 46 Phase Unbalance Protection 2.6.1 Reference Parameter Value 46 Type Magnitude Difference, NPS 46 Setting 0.1 ... 0.4 x Itheta 46 Time Mult setting 0.1 … 2 46 Delay setting 0.00 … 20 s 46 Min Operate Time setting 0.00 …...
Page 129 Chapter 3) 7SR17 Rho Performance Specification 20% Unbalance Setting 30% Unbalance Setting 100.00 1.0x time multiplier 0.3x time multiplier 10.00 1.00 0.5sec minimum operate time setting 0.10 % Unbalance Note % Unbalance refers to:- NPS unbalance = I x Itheta x 100...
Page 130: Negative Phase Sequence Voltage
Chapter 3) 7SR17 Rho Performance Specification 47 Negative phase sequence voltage 2.7.1 Reference Parameter Value 47-n Setting 1… 90V Hyst. 47-n Hysteresis setting 0, 0.1… 80% 47-n Delay setting 0.00 … 14400 s 2.7.2 Operate and Reset Level Attribute Value...
Page 131: Thermal Overload (Rotating Plant)
Chapter 3) 7SR17 Rho Performance Specification 49 Thermal overload (Rotating Plant) 2.8.1 Reference Parameter Value 49 Itheta Thermal Overload setting 0.1… 3 xIn 49 TauH Heating Constant setting 0.5… 1000 min Applied current for operate time 1.2 to 20 x Is 2.8.2...
Page 132 Chapter 3) 7SR17 Rho Performance Specification 10000.00 1000.00 100.00 Th = 100 Th = 50 Th = 30 Th = 20 10.00 Th = 15 Th = 10 Th = 5 Th = 3 Th = 2 1.00 Th = 1 Th = 0.5...
Page 133: Overcurrent
Chapter 3) 7SR17 Rho Performance Specification 50 Overcurrent 2.9.1 Reference Parameter Value 50-n Setting 0.05, 0.06… 25, 25.5… 50 xIn Applied Current (for operate time) 2 to 5 x Is 50-n Delay setting 0.00 … 14400 s 2.9.2 Operate and Reset Level...
Page 134: Measured Earth Fault
Chapter 3) 7SR17 Rho Performance Specification 2.10 50G Measured Earth Fault 2.10.1 Reference Parameter Value 50G-n Setting 0.005… 5 x In Applied Current (for operate time) 2 to 5 x Is 50G-n Delay setting 0.00 … 14400 s 2.10.2 Operate and Reset Level...
Page 135: Derived Earth Fault
Chapter 3) 7SR17 Rho Performance Specification 2.11 50N Derived Earth Fault 2.11.1 Reference Parameter Value 50N-n Setting 0.05… 50 xIn 50N-n Delay setting 0.00 … 14400 s 2.11.2 Operate and Reset Level Attribute Value Operate level 100 % Is, 5 % or...
Page 136: Time Delayed Overcurrent
Chapter 3) 7SR17 Rho Performance Specification 2.12 51 Time Delayed Overcurrent 2.12.1 Reference Parameter Value 51-n Setting 0.05… 2.5 xIn IEC-NI, -VI, -EI, -LTI; char 51-n Char setting ANSI-MI, -VI, -EI; DTL 51-n Time Mult (IEC/ANSI) 0.025… 100 51-n Delay (DTL) setting 0…...
Page 137: Operate And Reset Time
Chapter 3) 7SR17 Rho Performance Specification 2.12.3 Operate and Reset Time Attribute Value Starter operate time ( 2xIs) 20 ms, 20ms 5 % absolute or 30 ms, char = IEC-NI, IEC-VI, for char = IEC-NI : K = 0.14, = 0.02 IEC-EI, IEC-VI : K = 13.5,...
Page 138: Time Delayed Measured Earth Fault
Chapter 3) 7SR17 Rho Performance Specification 2.13 51G Time Delayed Measured Earth Fault 2.13.1 Reference Parameter Value 51G-n Setting 0.005, 0.006… 1.0 xIn IEC-NI, -VI, -EI, -LTI; Char 51G-n Char setting ANSI-MI, -VI, -EI; DTL 51G-n Time Mult (IEC/ANSI) 0.025, 0.05… 1.6 51G-n Delay (DTL) setting 0, 0.01…...
Page 139: Operate And Reset Time
Chapter 3) 7SR17 Rho Performance Specification 2.13.3 Operate and Reset Time Attribute Value Starter operate time ( 2xIs) 20 ms, 20ms 5 % absolute or 30 ms, char = IEC-NI, IEC-VI, for char = IEC-NI : K = 0.14, = 0.02 IEC-EI, IEC-VI : K = 13.5,...
Page 140: Time Delayed Derived Earth Fault
Chapter 3) 7SR17 Rho Performance Specification 2.14 51N Time Delayed Derived Earth Fault 2.14.1 Reference Parameter Value 51N-n Setting 0.05… 2.5 xIn IEC-NI, -VI, -EI, -LTI; char 51N-n Char setting ANSI-MI, -VI, -EI; DTL 51N-n Time Mult (IEC/ANSI) 0.025… 100 51N-n Delay (DTL) setting 0, 0.01…...
Page 141 Chapter 3) 7SR17 Rho Performance Specification 2.14.3 Operate and Reset Time Attribute Value Starter operate time ( 2xIs) 20 ms, 20ms 5 % absolute or 30 ms, char = IEC-NI, IEC-VI, for char = IEC-NI : K = 0.14, = 0.02 IEC-EI, IEC-VI : K = 13.5,...
Page 142: Operate And Reset Time
Chapter 3) 7SR17 Rho Performance Specification 2.15 55 Power Factor 2.15.1 Reference Parameter Value 55-n Setting 0.05…0.99 55-n Delay setting 0.00 … 14400 s 2.15.2 Operate and Reset Level Attribute Value Operate Level 0.05 Reset Level Under PF + 0.02 Over PF - 0.02...
Page 143: Under/Over Frequency
Chapter 3) 7SR17 Rho Performance Specification 2.16 81 Under/over frequency 2.16.1 Reference Parameter Value 81-n Setting 43, 43.01… 68 Hz Hyst 81-n Hysteresis setting 0, 0.1… 80% 81-n Delay setting 0.00 … 14400 s 2.16.2 Operate and Reset Level Attribute...
Page 144: 87Ref Restricted Earth Fault Protection
Chapter 3) 7SR17 Rho Performance Specification 2.17 87REF Restricted Earth Fault Protection 2.17.1 Reference Parameter Value 87REF Setting 0.005, 0.006… 2.00 x In 87REF Delay setting 0.00 … 60 s 2.17.2 Operate and Reset Level Attribute Value Operate level 100 % Is,...
Page 145: Section 3: Supervision Functions
Chapter 3) 7SR17 Rho Performance Specification Section 3: Supervision Functions 46PH REV Phase Reversal 3.1.1 Reference Parameter Value NPS to PPS ratio 20…100 % Delay setting 0…14400 s 3.1.2 Operate and Reset Level Attribute Value Operate level 100 % I Reset level >90 % I...
Page 146: 50Bcl Break Capacity Limit
Chapter 3) 7SR17 Rho Performance Specification 50BCL Break Capacity Limit 3.2.1 Reference Parameter Value Setting 1.0, 1.5… 50 xIn 3.2.2 Operate and Reset Level Attribute Value Operate level 100 % Is, 5 % or 1% In Reset level 95 % I...
Page 147: 50Bf & 50Bf-I4 Circuit Breaker Fail
Chapter 3) 7SR17 Rho Performance Specification 50BF & 50BF-I4 Circuit Breaker Fail 3.3.1 Reference Parameter Value 50BF Setting 0.050… 2.0 xIn 50BF-I4 Setting 0.005… 2.0 xIn 50BF-1 Delay setting 20… 60000ms CBF1 50BF-2 Delay setting 20… 60000ms CBF2 3.3.2 Operate and Reset Level...
Page 148: 60Cts & Cts-I Current Transformer Supervision
Chapter 3) 7SR17 Rho Performance Specification 60CTS & CTS-I Current Transformer Supervision 3.4.1 Reference Parameter Value 60CTS Inps 0.05… 1 x In thresh 60CTS-I Setting 0.05… 2 x In 60CTS Vnps 7… 110V thresh 60CTS Delay setting 60CTS-I Delay setting 0.03 …...
Page 149: 60Vts Voltage Transformer Supervision
Chapter 3) 7SR17 Rho Performance Specification 60VTS Voltage Transformer Supervision 3.5.1 Reference Parameter Value 60VTS V 7 … 110V 60VTS I 0.05, 0.1 … 1 x In 60VTS Ipps Load 0.05, 0.1 … 1 x In 60VTS Ipps Fault 0.05, 0.1 … 20 x In 60VTS Vpps 1, 2 …...
Page 150 Chapter 3) 7SR17 Rho Performance Specification 74T/CCS Trip/Close Circuit Supervision 3.6.1 Reference Parameter Value 74TCS-n Delay setting 0…60 s 3.6.2 Operate and Reset Time Attribute Value Element basic operate time 30ms 10ms basic Operate time following delay 1 % or...
Page 151 No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.
Page 152 Chapter 4) 7SR17 Rho - Data Communications Contents 1. Introduction......................5 2. Physical Connection....................6 2.1 Introduction.............................. 6 2.2 USB Interface (COM2)..........................7 2.3 RS485 Interface (COM1).........................8 3. IEC 60870-5-103 Definitions................. 10 3.1 Introduction............................10 3.2 Cause of Transmission..........................11 3.3 Application Service Data Unit (ASDU) Type..................12 3.4 Point List..............................13...
Page 153 Chapter 4) 7SR17 Rho - Data Communications 8. Modems......................... 68 8.1 Introduction............................68 8.2 Connecting a Modem to the Relay(s)....................68 8.3 Setting the Remote Modem........................68 8.4 Connecting to the Remote Modem....................... 68 9. Configuration......................70 10. Glossary.......................72 Appendix 1......................... 74 ©...
Page 154 Chapter 4) 7SR17 Rho - Data Communications List of Figures Fig. 2-1 Communication to Front USB Port......................7 Fig. 2-2 Communication to Multiple Devices using RS485 (Standard Port).............9 Fig. A1 Operating Mode Table..........................74 Chapter 4 - Page 4 of 75...
Page 155: Introduction
Reydisp Evolution or Reydisp Manager Software is available, for computers running Microsoft Windows™, to connect to devices to provide operational information, post-fault analysis, setting interrogation and editing facilities etc. Configuration software can be downloaded from our website http://www.siemens.com/energy. This section specifies connection details and lists the information available through the individual protocols.
Page 156: Physical Connection
OFF. When connecting to Reydisp Evolution software the protocol for the relevant port should be set to IEC60870-5-103. Siemens Protection Devices Limited (SPDL) can provide a range of interface devices, please refer to product portfolio catalogue. Full details of the interface devices can be found by referring to the website www.siemens.com/energy.
Page 157: Usb Interface (Com2)
Chapter 4) 7SR17 Rho - Data Communications 2.2 USB Interface (COM2) The USB communication port is connected using a standard USB cable with a type B connection to the relay and type A to the PC. The PC will require a suitable USB driver to be installed; this will be carried out automatically when the Reydisp software is installed.
Page 158: Rs485 Interface (Com1)
Chapter 4) 7SR17 Rho - Data Communications 2.3 RS485 Interface (COM1) The 2-wire RS485 communication port is located on the rear of the relay and can be connected using a suitable RS485 120 Ohm screened twisted pair cable. The RS485 electrical connection can be used in a single or multi-drop configuration. The RS485 master must support and use the Auto Device Enable (ADE) feature.
Page 159 Chapter 4) 7SR17 Rho - Data Communications Ext Wire loop (terminating resistance) added Rear terminals Rear terminals where permanent RS485 Screened RS485 Screened To Control drive from master twisted pair twisted pair System station available To Control System RS 485 Twisted pair Cable...
Page 160: Iec 60870-5-103 Definitions
Chapter 4) 7SR17 Rho - Data Communications 3. IEC 60870-5-103 Definitions 3.1 Introduction This section describes the IEC 60870-5-103 protocol implementation in the relays. This protocol is used for the communication with Reydisp software and can also be used for communication with a suitable control system.
Page 161: Cause Of Transmission
Chapter 4) 7SR17 Rho - Data Communications 3.2 Cause of Transmission The cause of transmission (COT) column of the “Information Number and Function” table lists possible causes of transmission for these frames. The following abbreviations are used: Abbreviation Description spontaneous event...
Page 162: Application Service Data Unit (Asdu) Type
Chapter 4) 7SR17 Rho - Data Communications 3.3 Application Service Data Unit (ASDU) Type The Application Service Data Unit (ASDU) column of the “Information Number and Function” table lists the possible ASDUs returned for a point. ASDU # Description 1 Time tagged message (monitor direction) 2 Time tagged message (relative time) (monitor direction) 3.1 Measurands I...
Page 163: Point List
Chapter 4) 7SR17 Rho - Data Communications 3.4 Point List The following sub-sections contain tables listing the data points available via the IEC60870-5-103 protocol. The information shown below is the default configuration. This can be modified using the Communications Configuration Editor tool, refer section 9 for details.
Page 164 Chapter 4) 7SR17 Rho - Data Communications Description ASDU 1 Virtual Input 1 1 SE, GI 2 Virtual Input 2 1 SE, GI 3 Virtual Input 3 1 SE, GI 4 Virtual Input 4 1 SE, GI 5 Virtual Input 5...
Page 165 Chapter 4) 7SR17 Rho - Data Communications Description ASDU 5 Power On 1 SE, GI 1 SE 19 LED Reset 20 Ack, Nak 22 Settings changed 1 SE 1 SE, GI 23 Setting G1 selected 20 Ack, Nak 1 SE, GI...
Page 166 Chapter 4) 7SR17 Rho - Data Communications Description ASDU 19 50N-2 2 SE, GI 20 51G-2 2 SE, GI 21 50G-2 2 SE, GI 34 50BF Stage 2 2 SE, GI 35 49-Alarm 2 SE, GI 36 49-Trip 2 SE, GI...
Page 167 Chapter 4) 7SR17 Rho - Data Communications Description ASDU 1 SE 176 Reset Energy Meters 20 Ack, Nak 177 Active Exp Meter Reset 1 SE 178 Active Imp Meter Reset 1 SE 179 Reactive Exp Meter Reset 1 SE 180 Reactive Imp Meter Reset...
Page 168 Chapter 4) 7SR17 Rho - Data Communications Description ASDU 59 46 1 SE, GI 60 48-1 1 SE, GI 61 48-2 1 SE, GI 62 RTD-1-Trip 1 SE, GI 63 RTD-1-Alarm 1 SE, GI 64 RTD-1-Fail 1 SE, GI 65 RTD-2-Trip...
Page 169 Chapter 4) 7SR17 Rho - Data Communications Description ASDU 104 Total Run Hrs Alarm 1 SE, GI 105 66 Restart Inhibit 1 SE, GI 106 Restart Inhibit 1 SE, GI 107 49 Restart Inhibit 1 SE, GI 108 Number Of Starts...
Page 170: Measurands
Chapter 4) 7SR17 Rho - Data Communications Description ASDU 1 SE 162 User DP Command 5 20 Ack, Nak 1 SE 163 User DP Command 6 20 Ack, Nak 1 SE 164 User DP Command 7 20 Ack, Nak 1 SE...
Page 171: Disturbance Recorder Actual Channel (Acc) Numbers
Chapter 4) 7SR17 Rho - Data Communications Description ASDU (1.2x) (Window 0.4%) 3.4.3 Disturbance Recorder Actual Channel (ACC) Numbers The following Disturbance Recorder channel numbers apply to this device. Description 1 V1 2 V2 3 V3 5 Ia 6 Ib...
Page 172: Modbus Definitions
Chapter 4) 7SR17 Rho - Data Communications 4. MODBUS Definitions 4.1 Introduction This section describes the MODBUS-RTU protocol implementation in the relays. This protocol is used for communication with a suitable control system. This protocol can be set to use any or all of the relays hardware interfaces (USB, Fibre Optic, RS232 and RS485).
Page 173 Chapter 4) 7SR17 Rho - Data Communications 4.2 MODBUS Register Data Types 4.2.1 FLOAT_IEEE_754 The float data type conforms to the IEEE 754 floating point definition. This specifies that 32 bits of data will be formatted as a sign bit in the most significant bit (MSB) followed by an 8 bit exponent then a 23 bit mantissa, down to the least significant bit (LSB).
Page 174: Fp_32Bits_3Dp
Chapter 4) 7SR17 Rho - Data Communications Address Value 30001 4974 30002 2400 On reception these two registers should be interpreted in the correct order as IEEE754 floating point representation. 4.2.2 FP_32BITS_3DP The FP_32BITS_3DP is a 32 bit integer fixed point value, containing 3 decimal places of information. It is used to send a real value to 3 decimal places as an integer.
Page 175: Event
Chapter 4) 7SR17 Rho - Data Communications Address Value 30001 162E On reception this register should be interpreted as a 16 bit integer. Truncation Calculations are performed as 32 bit. The 16 bit value is the lowest 16 bits of the 32 bit value.
Page 176: Eventcount
Chapter 4) 7SR17 Rho - Data Communications Description F# L Fault Number low byte. F# H Fault Number high byte. Meas Measurand format R32.23, sent least significant byte first. The following tables show the fields in the different event records as they are returned.
Page 177: Str32 & Str64
Chapter 4) 7SR17 Rho - Data Communications Byte Content ms L ms H Ye L Ye H Time Format. 4.2.8 STR32 & STR64 4.2.9 BITSTRING A Bit-String (or Bit-Array) is a method of compactly storing a number of bits of data. In this instance we store up to 16 bit values, for example the states of binary inputs, in a single 16 bit register.
Page 178: Point List
Chapter 4) 7SR17 Rho - Data Communications 4.3 Point List The information shown below is the default configuration. This can be modified using the Communications Configuration Editor tool, refer section 9 for details. 4.3.1 Coils (Read Write Binary values) Address...
Page 179 Chapter 4) 7SR17 Rho - Data Communications Address Name 10001 Binary Input 1 10002 Binary Input 2 10003 Binary Input 3 10004 Binary Input 4 10005 Binary Input 5 10006 Binary Input 6 10102 Remote Mode 10103 Out Of Service Mode 10104 Local Mode 10105 Local &...
Page 180 Chapter 4) 7SR17 Rho - Data Communications Address Name 10161 81-1 10162 81-2 10168 37-1 10169 37-2 10177 CB Total Trip Count 10178 CB Delta Trip Count 10180 I^2t CB Wear 10183 E/F Out 10211 Trip Circuit Fail 1 10212 Trip Circuit Fail 2...
Page 181 Chapter 4) 7SR17 Rho - Data Communications Address Name 10502 Virtual Input 2 10503 Virtual Input 3 10504 Virtual Input 4 10505 Virtual Input 5 10506 Virtual Input 6 10507 Virtual Input 7 10508 Virtual Input 8 10601 LED 1...
Page 182 Chapter 4) 7SR17 Rho - Data Communications Address Name 10913 User DP Command 6 10914 User DP Command 7 10915 User DP Command 8 10916 32-1 10917 32-2 10918 32S-1 10919 32S-2 10920 55-1 10921 55-2 10922 81B 10923 14-1...
Page 183: Input Registers (Read Only Registers)
Chapter 4) 7SR17 Rho - Data Communications Address Name 10958 RTD-10-Alarm 10959 RTD-10-Fail 10960 RTD-11-Trip 10961 RTD-11-Alarm 10962 RTD-11-Fail 10963 RTD-12-Trip 10964 RTD-12-Alarm 10965 RTD-12-Fail 10966 50BCL 10967 50BCL Block 10968 50BCL CBFail 10969 87REF 10970 No Accel 10971 Motor Start Counter Alarm...
Page 184 Chapter 4) 7SR17 Rho - Data Communications FW# Address Name Format Mult Description 30040 Va Nominal FP_32BITS_3DP 1.000000 Va Degrees 30042 Vb Nominal FP_32BITS_3DP 1.000000 Vb Degrees 30044 Vc Nominal FP_32BITS_3DP 1.000000 Vc Degrees 30048 Vzps FP_32BITS_3DP 1.000000 Vzps V...
Page 185 Chapter 4) 7SR17 Rho - Data Communications FW# Address Name Format Mult Description 30134 S (3P) FP_32BITS_3DP 0.000100 3 Phase VA 30136 Power Factor A FP_32BITS_3DP 1.000000 Phase A 30138 Power Factor B FP_32BITS_3DP 1.000000 Phase B 30140 Power Factor C FP_32BITS_3DP 1.000000 Phase C...
Page 186 Chapter 4) 7SR17 Rho - Data Communications FW# Address Name Format Mult Description 30346 OUT1-n BITSTRING 0.000000 Output 17-32 status 30347 VRT1-n BITSTRING 0.000000 Virtual 1-16 status 30348 VRT1-n BITSTRING 0.000000 Virtual 17-32 status 30349 EQN1-n BITSTRING 0.000000 Equation 1-16 status...
Page 187: Holding Registers (Read Write Registers)
Chapter 4) 7SR17 Rho - Data Communications FW# Address Name Format Mult Description 30638 Motor RTD5 STR32 1.000000 Temperature RTD5 30654 Motor RTD6 STR32 1.000000 Temperature RTD6 30670 Motor RTD7 STR32 1.000000 Temperature RTD7 30686 Motor RTD8 STR32 1.000000 Temperature RTD8...
Page 188: Dnp3 Definitions
(Also see the DNP 3.0 Implementation Table in Section 5.2, beginning on page 41). Vendor Name: Siemens Protection Devices Ltd. Device Name: 7SR17 Rho, using the Triangle MicroWorks, Inc. DNP3 Slave Source Code Library, Version Device Function: Highest DNP Level Supported: Master...
Page 189 Chapter 4) 7SR17 Rho - Data Communications DNP V3.0 DEVICE PROFILE DOCUMENT (Also see the DNP 3.0 Implementation Table in Section 5.2, beginning on page 41). Transmission Delay, (Configurable, default 0 sec) Select/Operate Arm Timeout, (Configurable, default 5 sec) Need Time Interval, (Configurable, default 30 minutes)
Page 190 Chapter 4) 7SR17 Rho - Data Communications DNP V3.0 DEVICE PROFILE DOCUMENT (Also see the DNP 3.0 Implementation Table in Section 5.2, beginning on page 41). Point-by-point list attached Sends Multi-Fragment Responses: Configurable Sequential File Transfer Support: File Transfer Support...
Page 191: Implementation Table
Chapter 4) 7SR17 Rho - Data Communications 5.2 Implementation Table The following table identifies which object variations, function codes, and qualifiers the Triangle MicroWorks, Inc. DNP 3.0 Slave Source Code Library supports in both request messages and in response messages. For static (non- change-event) objects, requests sent with qualifiers 00, 01, 06, 07, or 08, will be responded with qualifiers 00 or 01.
Page 192 Chapter 4) 7SR17 Rho - Data Communications REQUEST RESPONSE OBJECT (Library will parse) (Library will respond with) Function Object Function Codes Qualifier Codes Qualifier Codes Variation Description Codes Number (dec) (hex) (hex) (dec) 00, 01 (start-stop) Binary Output 1 (read)
Page 193 Chapter 4) 7SR17 Rho - Data Communications REQUEST RESPONSE OBJECT (Library will parse) (Library will respond with) Function Object Function Codes Qualifier Codes Qualifier Codes Variation Description Codes Number (dec) (hex) (hex) (dec) 32-Bit Delta Counter (with Flag) 16-Bit Delta Counter...
Page 194 Chapter 4) 7SR17 Rho - Data Communications REQUEST RESPONSE OBJECT (Library will parse) (Library will respond with) Function Object Function Codes Qualifier Codes Qualifier Codes Variation Description Codes Number (dec) (hex) (hex) (dec) 16-Bit Counter Change 06 (no range, or all)
Page 195 Chapter 4) 7SR17 Rho - Data Communications REQUEST RESPONSE OBJECT (Library will parse) (Library will respond with) Function Object Function Codes Qualifier Codes Qualifier Codes Variation Description Codes Number (dec) (hex) (hex) (dec) 17, 27, 28 (index) 00, 01 (start-stop)
Page 196 Chapter 4) 7SR17 Rho - Data Communications REQUEST RESPONSE OBJECT (Library will parse) (Library will respond with) Function Object Function Codes Qualifier Codes Qualifier Codes Variation Description Codes Number (dec) (hex) (hex) (dec) (with Time) Short Floating Point Frozen Analog Event...
Page 197 Chapter 4) 7SR17 Rho - Data Communications REQUEST RESPONSE OBJECT (Library will parse) (Library will respond with) Function Object Function Codes Qualifier Codes Qualifier Codes Variation Description Codes Number (dec) (hex) (hex) (dec) 22 (assign class) 06 (no range, or all)
Page 198: Point List
Chapter 4) 7SR17 Rho - Data Communications 5.3 Point List The tables below identify all the default data points provided by the implementation of the Triangle MicroWorks, Inc. DNP 3.0 Slave Source Code Library. This protocol can be set to use any or all of the relays hardware interfaces (USB, Fibre Optic, RS232 and RS485).
Page 199 Chapter 4) 7SR17 Rho - Data Communications Binary Input Points Static (Steady-State) Object Number: 1 (Packed Format) Change Event Object Number: 1 (w/o Time) Static Variation reported when variation 0 requested: 1 (Binary Input w/o status) or 2 (Binary Input with status)
Page 200 Chapter 4) 7SR17 Rho - Data Communications Binary Input Points Static (Steady-State) Object Number: 1 (Packed Format) Change Event Object Number: 1 (w/o Time) Static Variation reported when variation 0 requested: 1 (Binary Input w/o status) or 2 (Binary Input with status)
Page 201 Chapter 4) 7SR17 Rho - Data Communications Binary Input Points Static (Steady-State) Object Number: 1 (Packed Format) Change Event Object Number: 1 (w/o Time) Static Variation reported when variation 0 requested: 1 (Binary Input w/o status) or 2 (Binary Input with status)
Page 202 Chapter 4) 7SR17 Rho - Data Communications Binary Input Points Static (Steady-State) Object Number: 1 (Packed Format) Change Event Object Number: 1 (w/o Time) Static Variation reported when variation 0 requested: 1 (Binary Input w/o status) or 2 (Binary Input with status)
Page 203 Chapter 4) 7SR17 Rho - Data Communications Binary Input Points Static (Steady-State) Object Number: 1 (Packed Format) Change Event Object Number: 1 (w/o Time) Static Variation reported when variation 0 requested: 1 (Binary Input w/o status) or 2 (Binary Input with status)
Page 204 Chapter 4) 7SR17 Rho - Data Communications 5.3.2 Double Bit Input Points The default double bit input event buffer size is set to allow 100 events. Double bit inputs are by default returned in a class zero interrogation. Note, not all points listed here apply to all builds of devices.
Page 205 Chapter 4) 7SR17 Rho - Data Communications Binary outputs are by default NOT returned in a class zero interrogation. Note, not all points listed here apply to all builds of devices. Binary Output Status Points Static (Steady-State) Object Number: 10...
Page 206 Chapter 4) 7SR17 Rho - Data Communications Binary Output Status Points Static (Steady-State) Object Number: 10 Change Event Object Number: 11 Control Relay Output Blocks (CROB) Object Number: 12 Binary Output Command Event Object Number: 13 Static Variation reported when variation 0 requested: 1 (Binary Output w/o status)
Page 207 Chapter 4) 7SR17 Rho - Data Communications Binary Output Status Points Static (Steady-State) Object Number: 10 Change Event Object Number: 11 Control Relay Output Blocks (CROB) Object Number: 12 Binary Output Command Event Object Number: 13 Static Variation reported when variation 0 requested: 1 (Binary Output w/o status)
Page 208 Chapter 4) 7SR17 Rho - Data Communications Binary Output Status Points Static (Steady-State) Object Number: 10 Change Event Object Number: 11 Control Relay Output Blocks (CROB) Object Number: 12 Binary Output Command Event Object Number: 13 Static Variation reported when variation 0 requested: 1 (Binary Output w/o status)
Page 209: Counters
Chapter 4) 7SR17 Rho - Data Communications Binary Output Status Points Static (Steady-State) Object Number: 10 Change Event Object Number: 11 Control Relay Output Blocks (CROB) Object Number: 12 Binary Output Command Event Object Number: 13 Static Variation reported when variation 0 requested: 1 (Binary Output w/o status)
Page 210: Analog Inputs
Chapter 4) 7SR17 Rho - Data Communications Counters Static (Steady-State) Object Number: 20 Change Event Object Number: 22 Static Variation reported when variation 0 requested: 1 (32-Bit Counter with Flag) or 2 (16-Bit Counter with Flag) or 5 (32-Bit Counter w/o Flag)
Page 211 Chapter 4) 7SR17 Rho - Data Communications The default analog input event buffer size is set 30. The analog input event mode is set to Most Recent, only most recent event for each point is stored. Analog inputs are by default returned in a class zero interrogation.
Page 212 Chapter 4) 7SR17 Rho - Data Communications Analog Inputs Static (Steady-State) Object Number: 30 Change Event Object Number: 32 Analog Input Deadband: 34 Static Variation reported when variation 0 requested: 1 (32-Bit Analog Input with Flag) or 2 (16-Bit Analog Input with Flag)
Page 213 Chapter 4) 7SR17 Rho - Data Communications Analog Inputs Static (Steady-State) Object Number: 30 Change Event Object Number: 32 Analog Input Deadband: 34 Static Variation reported when variation 0 requested: 1 (32-Bit Analog Input with Flag) or 2 (16-Bit Analog Input with Flag)
Page 214 Chapter 4) 7SR17 Rho - Data Communications Analog Inputs Static (Steady-State) Object Number: 30 Change Event Object Number: 32 Analog Input Deadband: 34 Static Variation reported when variation 0 requested: 1 (32-Bit Analog Input with Flag) or 2 (16-Bit Analog Input with Flag)
Page 215: Additional Settings
Chapter 4) 7SR17 Rho - Data Communications Analog Inputs Static (Steady-State) Object Number: 30 Change Event Object Number: 32 Analog Input Deadband: 34 Static Variation reported when variation 0 requested: 1 (32-Bit Analog Input with Flag) or 2 (16-Bit Analog Input with Flag)
Page 216: Not Applicable
Chapter 4) 7SR17 Rho - Data Communications 6. Not Applicable This Page Intentionally Left Blank. Chapter 4 - Page 66 of 75 © 2013 Siemens Protection Devices Limited...
Page 217 Chapter 4) 7SR17 Rho - Data Communications 7. Not Applicable This Page Intentionally Left Blank. © 2013 Siemens Protection Devices Limited Chapter 4 - Page 67 of 75...
Page 218 Chapter 4) 7SR17 Rho - Data Communications 8. Modems 8.1 Introduction The communications interface has been designed to allow data transfer via modems. A suitable Modem can be connected directly to the Relay's RS232, RS485 or to fibre-optic port. An additional interface, for example a Sigma unit, may be required to connect to the fibre-optic port.
Page 219 Chapter 4) 7SR17 Rho - Data Communications Where a “dial-up” modem system is installed the settings on the remote modem are fixed so the local modem should negotiate with it on connection, choosing suitable matching settings. Where this is not possible the local modem should be set with settings equivalent to those of the remote modem as described above.
Page 220 Reydisp software Communications Editor tool. The Communications Editor is provided to allow its users to configure the Communication Protocol's Files in Reyrolle brand Relays manufactured by Siemens Protection Devices Limited (SPDL). The editor supports configuring DNP3, IEC60870-5-103, IEC60870-5-101 and MODBUS protocols.
Page 221 Chapter 4) 7SR17 Rho - Data Communications Note, as MODBUS points are polled they do not need to be enabled or disabled. The tool will allow: • Changing the Addresses for the Coils, Inputs and Registers. • Changing the format of the instrument returned in a register, e.g. 16 or 32 bit.
Page 222 When connecting relays in an optical ring architecture, the data must be passed from one relay to the next, therefore when connecting in this method all relays must have the Data Echo ON. EN100 Siemens' Ethernet communications module supporting IEC61850, available in optical and electrical versions. Ethernet A computer networking technology.
Page 223 Chapter 4) 7SR17 Rho - Data Communications RS485 Serial Communications Standard. Electronic Industries Association Recommended Standard Number 485. Start Bit Bit (logical 0) sent to signify the start of a byte during data transmission. Stop Bit Bit (logical 1) sent to signify the end.
Page 224 Chapter 4) 7SR17 Rho - Data Communications Appendix 1 The operating mode of the device is set via the setting, or through a command sent to a communications port. There are four options; Local, Remote, Local or Remote and Service.
Page 225 Chapter 4) 7SR17 Rho - Data Communications Siemens Protection Devices Ltd. (SPDL) P.O. Box 8 Hebburn Tyne and Wear NE31 1TZ United Kingdom For enquiries please contact our Customer Support Centre Tel.: +49 180/524 8437 (24hrs) Fax.: +49 180/524 2471 E-Mail:support.ic@siemens.com...
Page 226 This page is intentionally left blank...
Page 227 Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.
Page 229 Figure 4.1-2 E4 Case Terminal Arrangement viewed from rear................ 11 Figure 5.1-1 Connections Diagram for 7SR1702/3 Relay ................12 Figure 5.2-1 Connections Diagram for 7SR1705/6 Relay .................. 13 Figure 6.1-1 RS485 Data Comms Connections Between Relays ..............18 ©2014 Siemens Protection Devices Limited Page 3 of 18...
Page 231: Section 1: Installation
The relay contains no user serviceable parts, under no circumstances should the relay be dismantled. If any modules have been tampered with, then the guarantee will be invalidated. Siemens Protection Devices Limited reserves the right to charge for any subsequent repairs.
Page 232: Ancillary Equipment
The relays and protection systems manufactured under the Reyrolle brand currently do not come within the scope of either the European WEEE or RoHS directives as they are equipment making up a fixed installation. Page 6 of 18 ©2014 Siemens Protection Devices Limited...
Page 233: Section 2: Equipment Operating Conditions
RONT OVER The front cover provides additional securing of the relay element within the case. The relay cover should be in place during normal operating conditions. ©2014 Siemens Protection Devices Limited Page 7 of 18...
Page 234: Section 3: Dimensions And Panel Fixings
The following drawing which is available from the website gives panel cut-out and mounting details. Figure 3.1-1 Overall Dimensions and Panel Drilling for Size E4 Epsilon Case Hardware Model Net Weight Kg 7SR1702 7SR1703 7SR1705 7SR1706 Page 8 of 18 ©2014 Siemens Protection Devices Limited...
Page 235: Fixings
4 off M4 Nuts 4 off M4 Lock Washer Typical rear terminal block fixing kit (1kit per terminal block fitted to relay) Consists of: 28 off M4, 8mm Screws 28 off M4 Lock Washer ©2014 Siemens Protection Devices Limited Page 9 of 18...
Page 236: Section 4: Rear Terminal Drawings
2) RS485 (Block ”B” Terms 14, 16, 18, 20) connection to this communication facility is by screened, twisted pair cable. On site when wiring other facilities ensure that these terminals are not obscured by other wiring runs. Cable should be RS485 compliant. Page 10 of 18 ©2014 Siemens Protection Devices Limited...
Page 237 Chapter 5) 7SR17 Installation Guide Figure 4.1-2 E4 Case Terminal Arrangement viewed from rear ©2014 Siemens Protection Devices Limited Page 11 of 18...
Page 238: Section 5: Connection/Wiring/Diagrams
Chapter 5) 7SR17 Installation Guide Section 5: Connection/Wiring/Diagrams : 7SR1702/3 R IRING IAGRAM ELAY Figure 5.1-1 Connections Diagram for 7SR1702/3 Relay Page 12 of 18 ©2014 Siemens Protection Devices Limited...
Page 239 NOTES BI = Binary Input, BO = Binary Output Shows contacts internal to relay case assembly. Contacts close when relay chassis withdrawn from case Figure 5.2-1 Connections Diagram for 7SR1705/6 Relay ©2014 Siemens Protection Devices Limited Page 13 of 18...
Page 240 Phase Current Input CT/VT CONFIG: Selects 1 or 5A Earth Current Input CT/VT CONFIG: CT ratio for primary meters Phase CT Ratio CT/VT CONFIG: CT ratio for primary meters Earth CT Ratio Page 14 of 18 ©2014 Siemens Protection Devices Limited...
Page 241 Phase Current Input CT/VT CONFIG: CT ratio for primary meters Phase CT Ratio CT/VT CONFIG: Selects 1 or 5A Earth Current Input CT/VT CONFIG: CT ratio for primary meters Earth CT Ratio ©2014 Siemens Protection Devices Limited Page 15 of 18...
Page 242: Voltage Transformer Configurations
47, 27/59 & 81 Phase – Phase Calculated Vab, Vbc, 3V0 67 & 67N & 67G 47, 59N, 27/59 & 81 Phase – Neutral Calculated Phase – Phase Phase Vca Calculated Page 16 of 18 ©2014 Siemens Protection Devices Limited...
Page 243: Typical Connections
Chapter 5) 7SR17 Installation Guide YPICAL ONNECTIONS Busbar Contactor Motor BO General Trip Open BO Restart Inhibit Close BO 50BCL 7SR17 Rho Start Stop Pushbuttton ©2014 Siemens Protection Devices Limited Page 17 of 18...
Page 244: Section 6: Data Comms Connections
The RS485 data communications link with a particular relay will be broken if the relay element is withdrawn from the case, all other relays will still communicate. Figure 6.1-1 RS485 Data Comms Connections Between Relays Page 18 of 18 ©2014 Siemens Protection Devices Limited...
Page 245 Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.
Page 247 2.14 Power Protection ..........................45 2.14.1 Power (32) ......................... 45 2.14.2 Sensitive Power (32S) ......................47 2.14.3 Power Factor (55) ......................48 Section 3: Supervision Functions ........................49 3.1 Break Capacity Limit (50BCL) ......................49 ©2014 Siemens Protection Devices Limited Page 3 of 62...
Page 248 Section 4: Control & Logic Functions ........................ 59 4.1 Quick Logic ............................. 59 Section 5: Testing and Maintenance ......................... 60 5.1 Periodic Tests ..........................60 5.2 Maintenance ........................... 60 5.3 Troubleshooting ..........................60 Page 4 of 62 ©2014 Siemens Protection Devices Limited...
Page 249 List of Figures Figure 2-1 Directional Phase Fault Boundary System Angles ............25 Figure 2-2 Directional Earth Fault Boundary System Angles ............29 List of Tables Table 2-1 Troubleshooting Guide ....................61 ©2014 Siemens Protection Devices Limited Page 5 of 62...
Page 251: Section 1: Common Functions
The ‘Description of Operation’ section of this manual provides detailed information regarding the operation of each function of the relay. All functions are not available in all devices, please refer the ‘Description of Operation’ section to establish your function set. ©2014 Siemens Protection Devices Limited Page 7 of 62...
Page 252: Test Equipment
Note. One group may be used as a ‘Test’ group to hold test-only settings that can be used for regular maintenance testing, eliminating the need for the Test Engineer to interfere with the actual in-service settings in Page 8 of 62 ©2014 Siemens Protection Devices Limited...
Page 253: Relay Functionality
TEST/RESET key should be pressed to ensure any existing indication and output is correctly cleared. 1.2.7 Relay Functionality To aid relay testing the relay functionality is illustrated in logic diagram form – see chapter 1 ‘Description of Operation’. ©2014 Siemens Protection Devices Limited Page 9 of 62...
Page 254: Tests
Automated setting comparison can be carried out by Reydisp using the Compare Settings Groups function in the Edit menu. Any modified settings will be clearly highlighted. Page 10 of 62 ©2014 Siemens Protection Devices Limited...
Page 255: Ac Analogue Energising Quantities
Note. The time measured will include an additional delay, typically less than 20ms, due to the response time of the binary input hardware, software processing time and the operate time of the output relay. Tested Measured Measured Notes (method of initiation) Delay Delay ©2014 Siemens Protection Devices Limited Page 11 of 62...
Page 256: Binary Outputs
The operation of these contacts should be checked. CT Shorting contacts checked Binary Output 1 terminals 1 & 2 Alarm Checked Binary Output 2 terminals 5 & 6 Alarm Checked Page 12 of 62 ©2014 Siemens Protection Devices Limited...
Page 257: Section 2: Protection Functions
Measured E/F Undercurrent Restricted E/F Phase U/O voltage NPS Overvoltage U/O Frequency Power Break Cap. Limit Anti Backspin Phase Reversal Temp Inputs CB Fail VT Supervision CT supervision Trip Cct Supvn ©2014 Siemens Protection Devices Limited Page 13 of 62...
Page 258 At the end of testing the relay settings should be compared to the file extracted at the start to ensure that errors have not been introduced. Page 14 of 62 ©2014 Siemens Protection Devices Limited...
Page 259: Thermal Overload (49)
Thermal protection settings menu or by pressing the Test/Reset button when the Thermal Meter is shown in the Instruments Mode. Reset the thermal State then apply 2x the Overload Setting current. ©2014 Siemens Protection Devices Limited Page 15 of 62...
Page 260 50% thermal capacity, should reset in the following times assuming the initial thermal state = 100% Gn 49 TauC Cooling Constant Operate Time (sec) 41.6 83.2 124.8 166.4 207.9 415.9 623.8 831.8 1039.7 1247.7 2079.4 4158.9 Page 16 of 62 ©2014 Siemens Protection Devices Limited...
Page 261: Stall Protection (14)
Gn 14-2 Delay P.U. Current Operate Time (Amps) (sec) Amps 2 x 14-2 Setting Phase Gn 14–3 Setting Gn 14-3 Delay P.U. Current Operate Time (Amps) (sec) Amps 2 x 14-3 Setting ©2014 Siemens Protection Devices Limited Page 17 of 62...
Page 262 Chapter 6) 7SR17 Commissioning and Maintenance Guide Phase Gn 14–4 Setting Gn 14-4 Delay P.U. Current Operate Time (Amps) (sec) Amps 2 x 14-4 Setting Check Correct indication, Output 14-n, General Pickup Waveform record. Page 18 of 62 ©2014 Siemens Protection Devices Limited...
Page 263: Start Protection (48/66)
Inject current above ‘Gn 49 Motor Start Current’, for a period in excess of ‘Gn 48-n Delay’. Check that LED assigned to 48-n is illuminated. Start Time Gn 48-n Delay Check ’48-n Supervision Start Time Supvn’ 48-1 48-2 ©2014 Siemens Protection Devices Limited Page 19 of 62...
Page 264: Phase Unbalance Protection (46)
NPS Overcurrent can be tested using a normal 3P balanced source. Two phase current connections should be reversed so that the applied balanced 3P current is Negative Phase Sequence. Page 20 of 62 ©2014 Siemens Protection Devices Limited...
Page 265: Negative Phase Sequence
The Phase Unbalance elements can be blocked by Binary Input programmed to ‘Inhibit 46’. This functionality should be checked. Element BI Inhibits Check correct indication, trip output, alarm contacts, waveform record. When testing is complete reinstate any of the disabled functions. ©2014 Siemens Protection Devices Limited Page 21 of 62...
Page 266: Undercurrent (37)
Operate Time Tolerance (Amps) (sec) Amps 0.5 x Is 2.5.1.1 Element Blocking The Undercurrent elements can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 37-1 37-2 Page 22 of 62 ©2014 Siemens Protection Devices Limited...
Page 267 Element Blocking from current guard The elements can be blocked by undercurrent guard function. This functionality should be checked. Element Guard Setting Blocked 37-1 37-2 Check correct phase indication, trip output, alarm contacts, waveform record. ©2014 Siemens Protection Devices Limited Page 23 of 62...
Page 268: Phase Directional Polarity Check
0deg and the current phase angle is measured with respect to this reference. Alternatively, the instrument can be checked at the 4 points marked a,b,c & d on Figure 2-1 only. Page 24 of 62 ©2014 Siemens Protection Devices Limited...
Page 269: Out Of 3 Logic
Repeat the test with Phase A current as above but also with equal current in the B phase at 180º to that in the A phase. 1 phase current 2 phase current No 50/51-n Operation 50/51-n operation ©2014 Siemens Protection Devices Limited Page 25 of 62...
Page 270: Phase Overcurrent (67/50, 67/51)
Apply 2x setting current if possible and record operating time Phase Dir. P.U. Current Operate Time (Amps) (sec) Amps 2 x Is Check correct indication, trip output, alarm contacts, waveform record. Page 26 of 62 ©2014 Siemens Protection Devices Limited...
Page 271 (51-n only) and Voltage Controlled Overcurrent and can be made non-directional by VT Supervision. This functionality should be checked. Element BI Inhibits VTS action Inrush Detector 79 Autoreclose 51-1 51-2 50-1 50-2 ©2014 Siemens Protection Devices Limited Page 27 of 62...
Page 272 50% Reset 50% operate 50% operate time time (calculated) (measured) Time time (measured) (expected) (calculated) (calculated) First test (c) Second Test (c) Check correct indication, trip output, alarm contacts, waveform record. Page 28 of 62 ©2014 Siemens Protection Devices Limited...
Page 273: Directional Earth Fault Polarity Check (67N)
Note that the Derived Earth Fault, Measured Earth Fault and Sensitive Earth Fault have separate directional settings and must be tested individually. Figure 2-2 Directional Earth Fault Boundary System Angles ©2014 Siemens Protection Devices Limited Page 29 of 62...
Page 274: Derived Earth Fault (67/50N, 67/51N)
Derived EF elements can be separated from Measured/Sensitive EF by arrangement of the secondary injection circuit by shorting/disconnecting I Input. If any of these elements are defined as directional the correct voltage phase direction will be required to produce an operation of those elements. Page 30 of 62 ©2014 Siemens Protection Devices Limited...
Page 275: Directional Polarity
Compare to calculated values for operating times. P.U. Char. Operate Current Operate Time D.O. (NI EI VI LTI, P.U. D.O. 2 x Is 5 x Is & DTL) (Amps) (Amps) (sec) (sec) TIMING TESTS ©2014 Siemens Protection Devices Limited Page 31 of 62...
Page 276 50% Reset 50% operate 50% operate time time (calculated) (measured) Time time (measured) (expected) (calculated) (calculated) First test (c) Second Test (c) Check correct indication, trip output, alarm contacts, waveform record. Page 32 of 62 ©2014 Siemens Protection Devices Limited...
Page 277 (c) is 50% of the first (a) operate time. Operate Reset time Operate time 50% Reset 50% operate 50% operate time time (calculated) (measured) Time time (measured) (expected) (calculated) (calculated) First test (c) Second Test (c) ©2014 Siemens Protection Devices Limited Page 33 of 62...
Page 278: Measured Earth Fault (67/50G, 67/51G)
Measured EF elements can be separated from Derived EF and Sensitive EF by secondary injection of current through the I input circuit only. If any of these elements are defined as directional the correct voltage phase direction will be required to produce an operation of those elements. Page 34 of 62 ©2014 Siemens Protection Devices Limited...
Page 279: Directional Polarity
Compare to calculated values for operating times P.U. Char. Operate Current Operate Time D.O. (NI EI VI LTI, P.U. D.O. 2 x Is 5 x Is & DTL) (Amps) (Amps) (sec) (sec) TIMING TESTS ©2014 Siemens Protection Devices Limited Page 35 of 62...
Page 280 The Measured Earth Fault elements can be blocked by Binary Input Inhibit, VT Supervision and Inrush Detector operation. The Characteristic can be made non-directional by VT Supervision. This functionality should be checked. Element BI Inhibits VTS action Inrush Detector 51G-1 51G-2 50G-1 50G-2 Page 36 of 62 ©2014 Siemens Protection Devices Limited...
Page 281 (c) is 50% of the first (a) operate time. Operate Reset time Operate time 50% Reset 50% operate 50% operate time time (calculated) (measured) Time time (measured) (expected) (calculated) (calculated) First test (c) Second Test (c) ©2014 Siemens Protection Devices Limited Page 37 of 62...
Page 282: Restricted Earth Fault (87Ref)
CTs. Precautions should be taken to ensure that no personnel are at risk of contact with any of the energised secondary wiring during the test. Settings Data Voltage Setting Measured Page 38 of 62 ©2014 Siemens Protection Devices Limited...
Page 283 The Restricted Earth Fault element can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 87REF Check correct indication, trip output, alarm contacts, waveform record. Check that any shorting links are removed after testing. ©2014 Siemens Protection Devices Limited Page 39 of 62...
Page 284: Over/Under Voltage
Connect the relevant output contact(s) to stop the test set. Step the applied voltage to a level above the setting. The test set should be stopped at the operate time setting +/-5% Page 40 of 62 ©2014 Siemens Protection Devices Limited...
Page 285: Undervoltage Guard (27/59Uvg)
27 Undervoltage element resets, this can be detected by the General Pickup LED reset if no other element is operated (this includes any Undervoltage element which is not UV Guarded). Phase V element Blocked NOTES (Volts) Used for test Volts ©2014 Siemens Protection Devices Limited Page 41 of 62...
Page 286: Nps Overvoltage (47)
Element Blocking The NPS Overvoltage element can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 47-1 47-2 Check correct indication, trip output, alarm contacts, waveform record. Page 42 of 62 ©2014 Siemens Protection Devices Limited...
Page 287: Under/Over Frequency (81)
If the element is set as 81-nU/V Guarded, this setting can be tested by applying the test voltage at a level below the 81 U/V Guard Setting at a frequency in the operate range. Increase the voltage until the relay operates. ©2014 Siemens Protection Devices Limited Page 43 of 62...
Page 288 The U/O Frequency elements can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 81-1 81-2 Check correct indication, trip output, alarm contacts, waveform record. When testing is complete reinstate any of the disabled functions. Page 44 of 62 ©2014 Siemens Protection Devices Limited...
Page 289: Power Protection
Apply setting power +10% for Over-power or -10% for Under-power and record operating time. Power P.U. D.O. Operate NOTES (xSn) (sec) Power Power Time Guard (xSn) (xSn) +/- 0.5Hz 32-1 32-2 ©2014 Siemens Protection Devices Limited Page 45 of 62...
Page 290 The U/O Power elements can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 32-1 32-2 Check correct indication, trip output, alarm contacts, waveform record. When testing is complete reinstate any of the disabled functions. Page 46 of 62 ©2014 Siemens Protection Devices Limited...
Page 291: Sensitive Power (32S)
The U/O Power elements can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 32S-1 32S-2 Check correct indication, trip output, alarm contacts, waveform record. When testing is complete reinstate the disabled functions. ©2014 Siemens Protection Devices Limited Page 47 of 62...
Page 292: Power Factor (55)
The Power Factor elements can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 55-1 55-2 Check correct indication, trip output, alarm contacts, waveform record. When testing is complete reinstate any of the disabled functions. Page 48 of 62 ©2014 Siemens Protection Devices Limited...
Page 293: Section 3: Supervision Functions
‘CB Open’ binary input is energised AND 81B Delay has elapsed, or ‘CB Open’ binary input is energised AND V is less than ‘81B U/V Setting’ (‘81B U/V’ Enabled), or ‘No Accel’ binary input is energised (‘81B No Accel’ Enabled) ©2014 Siemens Protection Devices Limited Page 49 of 62...
Page 294: Phase Reversal
Inject 1A of balanced current. Gradually increase imbalance current, operating level should be as follows: 46 PH REV Setting 1P unbalance current (% of 3P current) 100% 129% 161% 200% 46 PH REV Setting 3P balanced current (A) 1P unbalance current (A) Measured Unbalance current Page 50 of 62 ©2014 Siemens Protection Devices Limited...
Page 295: Temperature Inputs
Where the external RTD monitoring interface is used the correct operation of each RTD can be checked by simulating the operation of the devices with potentiometers. Refer to the RTD interface data sheet for resistance values at various temperatures. ©2014 Siemens Protection Devices Limited Page 51 of 62...
Page 296: Current Transformer Supervision (60Cts)
Apply 3Phase balanced current to the relay, reduce the current in any one or two phases to a level below 60CTS-I setting. Measure the delay to operation. Gradually reduce the 3Phase current until the element resets. Setting Measured 60CTS-I Delay 60CTS-I Setting Page 52 of 62 ©2014 Siemens Protection Devices Limited...
Page 297: 7Sr1706
Setting Measured 60CTS Delay 60CTS Inps 60CTS Vnps 3.5.2.1 Element Blocking The CT Supervision function can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 60CTS ©2014 Siemens Protection Devices Limited Page 53 of 62...
Page 298: Voltage Transformer Supervision (60Vts)
3x the 60VTS I setting. Reduce voltage as above and check for VTS operation 60VTS I Setting Setting x 3 110% of Setting x 3 90% of Setting x 3 No VTS VTS operation Page 54 of 62 ©2014 Siemens Protection Devices Limited...
Page 299: Phase Vt Fail
If the VTS can be started from a status input fed from an external source, this functionality should be tested. Ext_Trig 60VTS Operation Not Applicable Element Blocking The VT Supervision can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 60VTS ©2014 Siemens Protection Devices Limited Page 55 of 62...
Page 300: Cb Fail (50Bf)
Repeat the sequence with current at 90% of the 50BF Setting current level after the element trip and check for no CB Fail operation. Repeat the sequence by injecting the current to I4 and using the 50BF-I4 Setting. Page 56 of 62 ©2014 Siemens Protection Devices Limited...
Page 301: Element Blocking
50BF-2 Delay………………. CB Closed CB Open No Operation No Operation Element Blocking The CB Fail function can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 50BF ©2014 Siemens Protection Devices Limited Page 57 of 62...
Page 302: Trip/Close Circuit Supervision (74T/Ccs)
The T/CCS-n Delay can be initiated by applying an inversion to the relevant status input and measured by monitoring of the alarm output. TCS-n Delay setting Measured CCS-n Delay setting Measured Page 58 of 62 ©2014 Siemens Protection Devices Limited...
Page 303: Section 4: Control & Logic Functions
The function of the Quick Logic equations should be tested conjunctively with connected plant or by simulation to assess suitability and check for correct operation on an individual basis with tests specifically devised to suit the particular application. ©2014 Siemens Protection Devices Limited Page 59 of 62...
Page 304: Section 5: Testing And Maintenance
Relay failure will be indicated by the ‘Protection Healthy’ LED being off or flashing. A message may also be displayed on the LCD. In the event of failure Siemens Protection Devices Ltd. (or one of its agents) should be contacted – see defect report sheet in section 5.3.
Page 305 Table 2-1 Troubleshooting Guide If the above checklist does not help in correcting the problem please contact the local Siemens office or contact PTD 24hr Customer Support, Tel: +49 180 524 7000, Fax: +49 180 524 2471, e-mail: support.energy@siemens.com.
Page 307 Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.
Page 308 Chapter 7) 7SR17 Rho Applications Guide This page is intentionally left blank...
Page 309 Chapter 7) 7SR17 Rho Applications Guide ONTENTS Contents ............................3 Section 1: Introduction ........................5 1.1 Plant Design - Motors ......................5 Section 2: Protection Functions ....................... 6 2.1 Thermal Protection ....................... 6 2.1.2 Stall Protection (14) ....................12 2.1.3 Start Protection (66) ....................
Page 310 Chapter 7) 7SR17 Rho Applications Guide 7.3 LEDs ..........................36 List of Figures Figure 2-1 Thermal Overload Protection ....................6 Figure 2-2 Summary of Protection Settings Calculation Procedure ............7 Figure 2.1-3 Thermal Heating (Cold) Characteristics ................9 Figure 2.1-4 Effect of Hot/Cold Curve Ratio Setting on Thermal Overload Operate Time ....10 Figure 2-5 Thermal Overload Protection ....................
Page 311: Section 1: Introduction
Chapter 7) 7SR17 Rho Applications Guide Section 1: Introduction LANT ESIGN OTORS Three phase AC motors use the synchronous or induction principle and have wide ranging power outputs from a few kW to several MW. Three phase induction motors are employed for all general purposes, typically in fixed speed applications to drive machinery, pumps, fans, compressors, conveyors, hoists etc.
Page 312: Section 2: Protection Functions
Chapter 7) 7SR17 Rho Applications Guide Section 2: Protection Functions This section provides guidance on the application and recommended settings of the 7SR17 protection functions. Motor faults can be divided into two categories – system faults affecting plant up to the motor terminals and faults within the motor.
Page 313 Chapter 7) 7SR17 Rho Applications Guide Generally the relay thermal setting calculation is carried out in the following order:- Figure 2-2 Summary of Protection Settings Calculation Procedure ©2014 Siemens Protection Devices Limited Page 7 of 36...
Page 314 Chapter 7) 7SR17 Rho Applications Guide Gn 49 NPS Weighting Where ‘Average’ is selected the relay uses the average 3-phase RMS current in the thermal algorithm, this is suitable for static plant e.g. thermal protection of a cable. Negative phase sequence current has an increased heating effect on rotating plant e.g. a motor. The relay should be set to ‘Sequence Components’...
Page 315 Chapter 7) 7SR17 Rho Applications Guide 2.1.1.1 Thermal Overload (49) Gn 49 Characteristic The IEC characteristic is used for general applications, see Figure 2.1-3. Additionally ‘User Defined’ curves are selectable, these are used where the thermal characteristic of the motor is significantly different e.g.
Page 316 Chapter 7) 7SR17 Rho Applications Guide Gn49 TauC Cooling Constant After an overload trip or when the motor is switched off the rotor slows until it stops. During the run-down and standstill states the motor will cool down but as the rotor does not produce forced cooling the thermal time constant will be different from the running state.
Page 317 Chapter 7) 7SR17 Rho Applications Guide Gn 49 Load Alarm An alarm is provided to indicate load currents above a user set value. High levels of load current may be indicative of bearing wear e.g. due to excessive vibration or loss of lubrication. The supply to the motor can be removed before further damage occurs.
Page 318: Stall Protection (14)
Chapter 7) 7SR17 Rho Applications Guide 2.1.2 Stall Protection (14) Figure 2-5 Thermal Overload Protection The motor will stall when the load torque exceeds the breakdown torque. The motor will draw a stall current equal to or approaching locked rotor current. The thermal overload protection may provide protection against stalling during running and starting, however, where this is not possible then the additional dedicated stall protection functions can be used.
Page 319 Chapter 7) 7SR17 Rho Applications Guide 2.1.2.2 Start Time Greater Than Stall Withstand Time Running Motor Thermal Withstand Thermal Overload Protection (Gn 49 Char) Gn 14-n Excessive Start Delay Time Protection Motor starting (Gn 14-n) characteristic Stalled Motor Thermal Withstand...
Page 320: Start Protection (66)
Chapter 7) 7SR17 Rho Applications Guide 2.1.3 Start Protection (66) During a start higher current will be drawn from the supply and will cause higher temperatures to be generated within the motor. This is exacerbated by the fact that the motor is not rotating and hence no cooling due to rotation is available.
Page 321: Setting Example - Thermal Protection
Chapter 7) 7SR17 Rho Applications Guide ETTING XAMPLE HERMAL ROTECTION Figure 2.2-1 Setting Example – Motor Circuit Data The motor full load current (FLC) and start current can be calculated:- Output Input power P.F. efficiency 0.85 0.955 Full load current 86.3...
Page 322 Chapter 7) 7SR17 Rho Applications Guide Thermal Protection - Common Settings NPS Weighting Negative phase sequence current has an increased heating effect on a motor, NPS Weighting should be set to ‘Sequence Components’ when applied to a motor. NPS Weighting Factor (K) Where machine data is available for the machine negative sequence withstand (NPS weighting factor), this figure should be used.
Page 323 Chapter 7) 7SR17 Rho Applications Guide 4.3/Itheta = 4.3/0.9 = 4.8 I The TauH value can be calculated from: (see Figure 2.1-3.) 8/60 TauH minutes As the safe stall time from cold (CSST) is 11 seconds, the TauH value could be set to 4 minutes e.g.
Page 324 Chapter 7) 7SR17 Rho Applications Guide Load Alarm Setting This current setting can be used to indicate abnormally high loading conditions e.g. 1.0 x Itheta. Thermal Restart Inhibit Setting This can be initially set to 50% in the absence of further information.
Page 325 Chapter 7) 7SR17 Rho Applications Guide Stall Protection The fundamentals of this protection feature are explained in section 2.1.2. In the example being considered the run-up time is 4 seconds and the safe stall time is 11 seconds. In this case the thermal characteristic gives sufficient protection for normal starting and a stalled motor condition can be detected by current/time grading.
Page 326: Overcurrent (50-N, 51-N)
Chapter 7) 7SR17 Rho Applications Guide – U (37) URRENT ROTECTION OSS OF LOAD NDERCURRENT Undercurrent elements are used to indicate that current has ceased to flow or that a low load situation exists. Definite Time Lag (DTL) elements are used. Loss of Load protection is applied to detect: Loss of pump flow e.g.
Page 327: Earth-Fault Protection (50G/50N)
Chapter 7) 7SR17 Rho Applications Guide (50G/50N) ARTH FAULT ROTECTION Earth fault current levels will be limited by the earth fault impedance the motor and associated plant. It may be difficult to make an effective short circuit to earth due to the nature of the installation and/or system earthing method and the earth fault current may therefore be limited to very low levels.
Page 328: High Impedance Restricted Earth Fault Protection (87Ref)
Chapter 7) 7SR17 Rho Applications Guide (87REF) MPEDANCE ESTRICTED ARTH AULT ROTECTION Restricted Earth Fault (REF) protection is applied to motors to detect low level earth faults in the stator windings. Current transformers are located as shown in Figure 2.6-1. During normal operation no current will flow in the relay element.
Page 329: Voltage Protection (27/59)
Chapter 7) 7SR17 Rho Applications Guide (27/59) OLTAGE ROTECTION 2.7.1 Under Voltage Power system under-voltages may last for only a few cycles or continue on a steady-state basis, they can occur due to system faults, an increase in system loading or loss of supply e.g. loss of an incoming transformer.
Page 330: Power Protection
Chapter 7) 7SR17 Rho Applications Guide 2.10 OWER ROTECTION 2.10.1 Power (32) An under power element protects against a loss of load condition by measuring the real power flow to the motor in the running condition. This provides an alternative to under current measurement as load loss may result in only a small change in current (see section 2.3).
Page 331: Section 3: Current Transformer (Ct) Requirements
Chapter 7) 7SR17 Rho Applications Guide Section 3: Current Transformer (CT) Requirements RATIO The CT primary rating is usually chosen to be equal to or greater than the motor full load current. Output Input power P.F. efficiency 0.85 0.955 Full...
Page 332: Section 4: Supervision And Monitoring Functions
Chapter 7) 7SR17 Rho Applications Guide Section 4: Supervision and Monitoring Functions (50BCL) REAKING APACITY IMIT Motors are generally controlled by three methods: Larger rated motors typically at 3.3kV or 11kV use circuit breakers, Medium to smaller rated motors use MCCB’s or fused contactors.
Page 333: Voltage Transformer Supervision (60Vts)
Chapter 7) 7SR17 Rho Applications Guide (60VTS) OLTAGE RANSFORMER UPERVISION Voltage Transformers (VTs) rarely fail, however, VT Supervision is commonly applied because the fuses connected in series with the VTs may fail. When a VT failure occurs on one or two phases, the voltage levels seen by the protection become unbalanced. A large level of NPS voltage is therefore detected - around 0.3 x Vn for one or two VT failures.
Page 334: Trip-Circuit Supervision (74Tcs)
Chapter 7) 7SR17 Rho Applications Guide (74TCS) IRCUIT UPERVISION Binary Inputs may be used to monitor the integrity of the CB trip circuit wiring. A small current flows through the B.I. and the trip circuit. This current operates the B.I. confirming the integrity of the auxiliary supply, CB trip coil, auxiliary switch, C.B.
Page 335 Chapter 7) 7SR17 Rho Applications Guide Scheme 2 (Intermediate) Figure 4-2: Trip Circuit Supervision Scheme 2 (H6) Scheme 2 provides continuous Trip Circuit Supervision of trip coil with the circuit breaker Open or Closed. It does not provide pre-closing supervision of the connections and links between the tripping contacts and the circuit breaker and may not therefore be suitable for some circuits which include an isolating link.
Page 336: Close Circuit Supervision Connections
Chapter 7) 7SR17 Rho Applications Guide 4.5.2 Close Circuit Supervision Connections Figure 4-4 Close Circuit Supervision Scheme Close circuit supervision with the circuit breaker Open or Closed. Page 30 of 36 ©2014 Siemens Protection Devices Limited...
Page 337: Circuit-Breaker Fail (50Bf)
Chapter 7) 7SR17 Rho Applications Guide (50BF) IRCUIT REAKER Where a circuit breaker fails to operate to clear fault current the power system will remain in a hazardous state until the fault is cleared by remote or back-up protections. To minimise any delay, CB Failure protection provides a signal to either re-trip the local CB or back-trip ‘adjacent’...
Page 338: Section 5: Control & Logic Functions
Chapter 7) 7SR17 Rho Applications Guide Section 5: Control & Logic Functions EFINED OGIC 5.1.1 Undervoltage Auto Restart (Restoration of Supply) As an example user defined logic can be used to provide an undervoltage auto-restart scheme. Motors can be automatically re-started after a momentary power loss. When the control voltage drops below drop- out voltage the contactors are de-energised.
Page 339: Section 6: Application Examples
Chapter 7) 7SR17 Rho Applications Guide Section 6: Application Examples UNCTION AND ONNECTION IAGRAMS Figure 6.1-1 7SR1703 Function Diagrams Figure 6.1-2 7SR1706 Function Diagrams ©2014 Siemens Protection Devices Limited Page 33 of 36...
Page 340: Section 7: Common Functions
Chapter 7) 7SR17 Rho Applications Guide Section 7: Common Functions INARY NPUTS Each Binary Input (BI) can be programmed to operate one or more of the relay functions, LEDs or output relays. These can be used to bring such digital signals as Inhibits for protection elements, CB position status and trip circuit supervision status etc.
Page 341 Chapter 7) 7SR17 Rho Applications Guide Figure 7-1 – Binary Input Configurations Providing Compliance with EATS 48-4 Classes ESI 1 and ESI 2 ©2014 Siemens Protection Devices Limited Page 35 of 36...
Page 342 Chapter 7) 7SR17 Rho Applications Guide INARY UTPUTS Binary Outputs are mapped to output functions by means of settings. These could be used to bring out such digital signals as trips, a general pick-up, plant control signals etc. All Binary Outputs are trip rated...
Page 344 Printed in Fürth Printed on elementary chlorine-free bleached paper. All rights reserved. Trademarks mentioned in this document are the property of Siemens AG, its affiliates, or their respective owners. Subject to change without prior notice. The information in this document contains general descriptions of the technical options available, which may not apply in all cases.

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