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Siemens 7SG164 Ohmega 400 Series Manual

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Summary of Contents for Siemens 7SG164 Ohmega 400 Series

  • Page 1 Reyrolle Protection Devices 7SG16 Ohmega 402-60 Protection Relays Answers for energy...
  • Page 2 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 3 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 4: Table Of Contents

    7SG164 Ohmega 400 Series Description of Operation Contents General ............................. 3 Protection Functions ......................... 3 Output Contacts ..........................3 Status Inputs ............................. 3 Multiple Setting Groups........................4 Instrumentation and Metering ......................4 Metering ............................ 4 Secondary Values ........................4 Primary Values.......................... 4 Phase Sequence Currents and Voltages ..................

  • Page 5: General

    7SG164 Ohmega 400 Series Description of Operation 1 General The relays provide high speed Distance protection and have independent measuring elements for each fault condition and zone of operation. This gives a true full scheme operation. The impedance measurement is a continuous process therefore under impedance starting elements are not required.

  • Page 6: Multiple Setting Groups

    7SG164 Ohmega 400 Series Description of Operation 5 Multiple Setting Groups The relays provides up to eight alternative settings groups, making it possible to edit one group while the relay protection algorithms operate using another ‘active’ group. The relay can be switched from one group of settings to another to suit alterations in the power system configuration.

  • Page 7: Data Storage

    7SG164 Ohmega 400 Series Description of Operation The time and date is also displayed. Where appropriate, additional meter displays are available depending upon the functions supplied with the relay. These will be described in the relevant sections. 7 Data Storage Data records are available in three forms, namely fault records, waveform records and event records.

  • Page 8: Communications

    7SG164 Ohmega 400 Series Description of Operation • Change of state of Status Inputs • Change of state of any protection characteristic • Main Trip Other events are available depending upon the features included in the relay -they are described with the relevant feature.

  • Page 9: Self Monitoring

    Note that the password validation screen also displays a numerical code. If the password is lost or forgotten, this code can be communicated to Siemens by authorised personnel, and the password can be retrieved. The relay is supplied with the password set to "NONE" which means the feature is de-activated.

  • Page 10: Led Indications

    7SG164 Ohmega 400 Series Description of Operation 11.3 LED Indications The following indications are provided: Protection Healthy - Green LED. This LED indicates that DC volts have been applied to the relay and that the relay is operating correctly. If a permanent fault is detected by the internal supervision, then this LED will continuously flash.
  • Page 11 7SG164 Ohmega 400 Series Description of Operation CANCEL FAULT FAULT DATA RELAY IDENTIFIER LED TEST DISPLAY SETTINGS INSTRUMENTS FAULT DATA MODE MODE MODE PRIMARY VOLTAGE SYSTEM CONFIG FAULT 1 PRIMARY CURRENT MENU. TO VIEW SECONDARY VOLTAGE FAULT N SECONDARY CURRENT DISTANCE PROTECTION MENU.

  • Page 12: Relay Hardware

    7SG164 Ohmega 400 Series Description of Operation A sub-menu is opened by pressing the key when viewing one of the above title screens. The settings within the sub-menu can then be viewed in turn. Leaving a sub-menu, by scrolling either upwards or downwards, causes it to be automatically closed.

  • Page 13: Internal Construction

    7SG164 Ohmega 400 Series Description of Operation 13.1 Internal Construction The design for the internal arrangement of each module has been chosen to provide a high level of EMI screening, using multi-layer PCBs with ground planes, RFI suppression components and earthed metal screens.
  • Page 14 7SG164 Ohmega 400 Series Description of Operation Figure 1 –Human Machine Interface (HMI) Features Relay type 2 line 20 character back lit L.C. display Alarm description Protection healthy L.E.D. Local RS232 port Five button key pad 32 programmable alarm and trip L.E.D’s ©2011 Siemens Protection Devices Limited...
  • Page 15 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 17 7SG164 Ohmega 400 Series Impedance Functions Contents Distance Protection Functions ..................4 Polarised MHO Characteristic....................4 1.1.1 Cross-Polarised MHO..................4 1.1.2 Offset Mho Characteristic .................. 5 1.1.3 Fault Configuration .................... 5 1.1.4 Zone 3 Shaped Characteristics ................. 8 1.1.5 Comparison of Setting with THR Relay ............. 9 Quadrilateral Characteristic....................

  • Page 18: Distance Protection Functions

    7SG164 Ohmega 400 Series Impedance Functions 1 Distance Protection Functions 1.1 Polarised MHO Characteristic 1.1.1 Cross-Polarised MHO It is fundamental to the requirements of discrimination that distance protection Zone 1 and 2 measuring characteristics for direct tripping are directional since they are required to detect faults in the forward direction only.

  • Page 19: Offset Mho Characteristic

    7SG164 Ohmega 400 Series Impedance Functions 1.1.2 Offset Mho Characteristic The offset Mho characteristic is shown in figure 2. The characteristic is set with a forward reach, ZF and a reverse reach, ZR. This type characteristic may be selected for Zone 3, and it provides time delayed back-up for faults behind the relaying point.
  • Page 20 7SG164 Ohmega 400 Series Impedance Functions To correctly measure the impedance to the fault point, the correct current and voltage must be applied to the relay. The relay impedance setting is made in terms of the positive sequence impedance to the point of reach which means that the relay setting is the same for all types of fault.
  • Page 21 7SG164 Ohmega 400 Series Impedance Functions This is a convenient factor to use in the phase comparison logic as the actual value of Z0 is not required provided the ratio Z 0 / Z1 and the phase angles of Z0 and Z1 are available. The K0 factor...

  • Page 22: Zone 3 Shaped Characteristics

    7SG164 Ohmega 400 Series Impedance Functions 1.1.4 Zone 3 Shaped Characteristics In circumstances where the zone conditions come within the reach of the Zone 3 Characteristic blinders can be applied to prevent load encroachment (See figure 7a, below). Obviously, this presents no problem for the Quad characteristic, since the reach along the resistive axis can be limited.

  • Page 23: Comparison Of Setting With Thr Relay

    7SG164 Ohmega 400 Series Impedance Functions The above figure shows the position of blinders if different values are chosen for SF1 & SF2. 1.1.5 Comparison of Setting with THR Relay In order to ease application of the characteristic, it is recommended that the same ratios of minor to major axis are used as were provided with the THR relay.

  • Page 24: Quadrilateral Characteristic

    7SG164 Ohmega 400 Series Impedance Functions 1.2 Quadrilateral Characteristic In addition to MHO characteristics, some models of the relay have the option of quadrilateral characteristics for earth fault coverage. The quadrilateral characteristic can be set according to resistive coverage, reactive coverage and the line angle. The resistive cut off blinder is set to the same angle as the line angle.
  • Page 25 7SG164 Ohmega 400 Series Impedance Functions Figure 10 Polarised Directional Characteristic As can be seen, the characteristic moves behind the origin for forward faults, and forward of it for reverse faults. In addition, as the SIR level increases (ZS increases relative to Z) the characteristic moves further from the origin.
  • Page 26 7SG164 Ohmega 400 Series Impedance Functions The replica impedance ZF has magnitude RF cos (ΦL − 90) and angle Φ L − 90°. The relay is set using parameters for the line impedance, resistive reach and characteristic angle as shown below: ©2010 Siemens Protection Devices Limited...

  • Page 27: Offset Quadrilateral Characteristic

    7SG164 Ohmega 400 Series Impedance Functions 1.2.2 Offset Quadrilateral Characteristic A typical offset quadrilateral characteristic is shown below. This is constructed using forward and reverse resistance characteristics, and forward and reverse reactance characteristics. This would be used for the offset zone 3 characteristic.

  • Page 28: Voltage Memory

    7SG164 Ohmega 400 Series Impedance Functions 1.3 Voltage Memory The relay incorporates a voltage memory feature. This ensures directional security under closein three phase fault conditions when there is little or no healthy phase voltage available for cross-polarising. The relay monitors the positive sequence voltage of the system, and under fault conditions it adds a replica of this voltage to the polarising voltage of each comparator, suitable phase-shifted to align it with the ideal polarising voltage.

  • Page 29: Power Swing Characteristics

    7SG164 Ohmega 400 Series Impedance Functions 1.6 Power Swing Characteristics 1.6.1 Applications A power swing is the result of a change in angle between two power systems. Each system can be subjected to disturbances such as faults, loss of load, loss of large generation, etc. which in turn, may result in excursions of generator rotor angles.

  • Page 30: Description Of Operation

    7SG164 Ohmega 400 Series Impedance Functions 1.6.2 Description of Operation 1.6.2.1. Power Swing Detection. The relay uses 2 zones of protection to detect a power swing condition, defined as the inner and the outer zones. Each of these zones consists of a phase to phase fault comparator applied to the Yellow- Blue phase.

  • Page 31: Voltage Transformer Supervision (Vts)

    7SG164 Ohmega 400 Series Impedance Functions 1.7 Voltage Transformer Supervision (VTS) 1.7.1 Applications. A protection voltage transformer (V.T.) would normally be connected to the protection relay terminals via a fuse or a miniature circuit breaker. Operation of these would remove the voltage source for one or more phases.

  • Page 32: Settings

    7SG164 Ohmega 400 Series Impedance Functions approximately 2/3 of the minimum operating time of the zone 1 to ensure an adequate time margin for blocking. The inhibit signal is available immediately whereas the alarm signal has a time delay, which can be set from 0-60000ms to prevent nuisance alarms occurring during circuit breaker switching.

  • Page 33: Switch On To Fault (Sotf)

    7SG164 Ohmega 400 Series Impedance Functions 1.8 Switch On To Fault (SOTF) 1.8.1 Applications The Zone 1 instantaneous elements of the OHMEGA distance protection are directional and rely upon polarisation from either the faulted phase and/or a healthy phase. When closing on to a bolted fault where all three-phase voltages are extremely low, the Zone 1 instantaneous elements may not operate.

  • Page 34: Settings

    7SG164 Ohmega 400 Series Impedance Functions element. A longer time delay is used for the DC SOTF logic (400ms rather than 200ms) because it needs to incorporate the closing time for the circuit breaker, also. The status input ‘Start Aux DC SOTF’ is connected to a CB auxiliary contact to signal CB closing. This function operates similarly to the Manual Close DC SOTF except that the CB aux contact must indicate that the CB is open for the ‘Min Aux DC SOTF Dead Time’...

  • Page 35: Auxilary Functions

    7SG164 Ohmega 400 Series Impedance Functions 2 Auxilary Functions 2.1 Fault Locator 2.1.1 Applications The fault locator gives the operator an indication of the location of the fault. This information can be presented in three different formats which are a percentage of line length, or the distance in either miles or kilometres.
  • Page 36 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 37 2 Schemes Incorporating a Signalling Channel ................7 Permissive Underreach......................7 Permissive Overreach Zone 1 – POR1..................9 Permissive Overreach Zone 2 – POR2................... 10 Blocked Overreach........................13 ©2010 Siemens Protection Devices Limited Chapter 3 Page 2 of 13...

  • Page 38: Basic Schemes

    This may be acceptable for lower voltage distribution systems, but for important circuits or higher voltage systems additional schemes are available to improve the tripping of the relay. 1.1.2 Settings Distance Scheme: Distance Scheme TIME-STEPPED Status Inputs: Relay Outputs: ©2010 Siemens Protection Devices Limited Chapter 3 Page 3 of 13...

  • Page 39: Loss Of Load (Some Models Only)

    LOL Level 0.1..0.9 (0.5x In) LOL CB Op Delay or LOL Pole Scatter Delay 0..50 (20ms) LOL Time Limit 0..60000 (40ms) Status Inputs: Relay Outputs: AIDED TRIP, LOSS OF LOAD ©2010 Siemens Protection Devices Limited Chapter 3 Page 4 of 13...

  • Page 40: Reach Extension (Some Models Only)

    Block Reach Extension status input is energised whenever the autorecloser is out of service. If the relay features an internal autorecloser, a normally closed contact should be assigned to Autorecloser in Service and connected back into the “Block Reach Extension” status input. ©2010 Siemens Protection Devices Limited Chapter 3 Page 5 of 13...
  • Page 41 Zone 1 X EF Impedance Reach These are the settings used by the relay for the first trip Zone 1 X EF Resistance Reach Status Inputs: BLOCK REACH EXT. Relay Outputs: N/A ©2010 Siemens Protection Devices Limited Chapter 3 Page 6 of 13...

  • Page 42: Schemes Incorporating A Signalling Channel

    2.1.2 Settings. Distance Scheme SS Pickup 0..60000 (0ms) SS Dropoff 0..60000 (1ms) SR Dropoff 0..60000 (1ms) Status Inputs: UNSTABILISE RELAY, CARRIER RECV GUARD ©2010 Siemens Protection Devices Limited Chapter 3 Page 7 of 13...
  • Page 43 7SG16 Ohmega 402 60 Protection Schemes Relay Outputs: AIDED TRIP ©2010 Siemens Protection Devices Limited Chapter 3 Page 8 of 13...

  • Page 44: Permissive Overreach Zone 1 - Por1

    POR-1 and POR-2, for a description of these features see the POR-2 section of this document. 2.2.2 Settings Distance Scheme POR1 SS Pickup 0..60000 (0ms) SS Dropoff 0..60000 (1ms) SR Dropoff 0..60000 (1ms) Status Inputs:CARRIER RECV GUARD Relay Outputs: AIDED TRIP ©2010 Siemens Protection Devices Limited Chapter 3 Page 9 of 13...

  • Page 45: Permissive Overreach Zone 2 - Por2

    Pulse Width. On receipt of a signal from the remote end, if the local circuit breaker is open, the relay will echo the signal back to the remote end relay. This will remove the time delay from the Zone 2 element, allowing tripping after a short time delay. ©2010 Siemens Protection Devices Limited Chapter 3 Page 10 of 13...
  • Page 46 AND there is a residual voltage greater than the WI Voltage Level AND the local CB is closed, the relay will ©2010 Siemens Protection Devices Limited Chapter 3 Page 11 of 13...
  • Page 47 SS Dropoff 0..60000 (1ms) SR Dropoff 0..60000 (1ms) tatus Inputs: SIGNA L RECEIVE 1 CARRIER RECV GUA Relay Ou tputs: AIDED TRIP SIGNAL SEND SIGNAL RECEIVE POR WEAK INFEED ©2010 Siemens Protection Devices Limited Chapter 3 Page 12 of 13...

  • Page 48: Blocked Overreach

    Permissive Trip Time 0..60000 (1ms) SS Pickup 0..60000 (0ms) SS Dropoff 0..60000 (1ms) SR Dropoff 0..60000 (1ms) Status Inputs: BLOCK MODE INHIBIT, CARRIER RECV GUARD, UNSTABILISE RELAY Relay Outputs: N/A ©2010 Siemens Protection Devices Limited Chapter 3 Page 13 of 13...
  • Page 49 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 50 Aux Protection Menu ........................13 Reylogic Config ..........................14 Status Config............................15 Output Config ...........................16 Output Relay Dwell Time Menu......................17 LED Configuration Menu........................17 2.10 Data Storage Menu...........................18 2.11 Communications Menu ........................18 2.12 Fault Locator Menu...........................19 ©2013 Siemens Protection Devices Limited Chapter 4 Page 2 of 20...
  • Page 51 101, … 250 Z3 PF Impedance (Rev) 0.5, 0.51, … 10.0, 8.00 Ohm 10.1, 10.2, … 100, 101, … 250 Z3 PF Shape Factor 1 0, 0.01, … 1.00 1.00 ©2013 Siemens Protection Devices Limited Chapter 4 Page 3 of 20...
  • Page 52 (Disabled..Enabled) Enabled VTS Input Source (Res I/V…NPS I/V) Res I/V VTS Ires Level (0.05..2) 0.3 x In VTS Vop Level (1..100) VTS 3PV Level (1..70) VTS 3PLOV Delay (0..10) ©2013 Siemens Protection Devices Limited Chapter 4 Page 4 of 20...
  • Page 53 Stub Protection NONE, 1 … 29 13,17,24 Z2 TD Override Trip NONE, 1 … 29 Zone 4 Trip NONE, 1 … 29 NONE SOTF Operated NONE, 1 … 29 ©2013 Siemens Protection Devices Limited Chapter 4 Page 5 of 20...
  • Page 54 NONE, 1 … 29 NONE Phase A Fault NONE, 1 … 29 Phase B Fault NONE, 1 … 29 Phase C Fault NONE, 1 … 29 Earth Fault NONE, 1 … 29 ©2013 Siemens Protection Devices Limited Chapter 4 Page 6 of 20...
  • Page 55 0.1, 0.11, …,10, 10.1, …, 100, 101, …, 250 10.00 Ohm Sec'y Z+ per unit distance 0.001, 0.002, …, 5 0.500 Ohm Display distance as Percent, Kilometres, Miles Percent ©2013 Siemens Protection Devices Limited Chapter 4 Page 7 of 20...

  • Page 56: Settings Walkthrough

    (“INSTRUMENTS MODE” or “FAULT DATA MODE”). Press the down arrow key . The relay enters the settings list and displays “SYSTEM CONFIG MENU”. ©2013 Siemens Protection Devices Limited Chapter 4 Page 8 of 20...

  • Page 57: System Config Menu

    “NONE”. Once a password has been set, the relay will display a 10 digit code in the Change Password setting. If the password has been lost then an authorised person should contact a Siemens representative, quoting this 10- digit code. This can be used to obtain the current password.

  • Page 58: Distance Protection Menu

    Z2 Earth Fault (Disabled..Enabled) Enabled Operation of the Zone 2 earth-fault elements A-E, B-E & C-E, can be enabled or disabled from this setting. Z2 EF Impedance (0.1..250) ohms ©2013 Siemens Protection Devices Limited Chapter 4 Page 10 of 20...
  • Page 59 The reverse Zone 4 phase-fault elements A-B, B-C & C-A, can be enabled or disabled from this setting. Z4 PF Impedance (0.1..250) ohms Defines the Zone 4 phase-fault impedance reach (in terms of secondary positive sequence impedance) for the mho characteristic. ©2013 Siemens Protection Devices Limited Chapter 4 Page 11 of 20...

  • Page 60: Power Swing Menu

    This is the length of time for which the impedance characteristic must be between the inner and outer Zones of the Power Swing Detector for a Power Swing to be detected. The default setting of 50ms should be suitable for most applications. ©2013 Siemens Protection Devices Limited Chapter 4 Page 12 of 20...

  • Page 61: Aux Protection Menu

    Note that the level is set based on the RESIDUAL voltage and current, i.e. 3Vo and 3Io levels, these are defined as 3x the Zero phase sequence ©2013 Siemens Protection Devices Limited Chapter 4 Page 13 of 20...

  • Page 62: Reylogic Config

    This is the minimum time that the VT fail conditions must remain on the system before the VT alarm is operated. It is usually set to 5000ms to avoid nuisance alarms. ©2013 Siemens Protection Devices Limited Chapter 4 Page 14 of 20...

  • Page 63: Status Config

    Input X Operated output to operate. CB Closed (39 Character String) NONE This input is driven from a circuit breaker auxiliary contact and used to inform the relay that the circuit breaker is closed. ©2013 Siemens Protection Devices Limited Chapter 4 Page 15 of 20...

  • Page 64: Output Config

    Z2 TD Override Trip If the zone 2 TD Override feature is used, when the status input assigned to Z2 TD Override is energised, this output contact will operate. ©2013 Siemens Protection Devices Limited Chapter 4 Page 16 of 20...

  • Page 65: Output Relay Dwell Time Menu

    With the exception of the “Protection Healthy” item, this menu has the same relay outputs as the output Configuration menu and these can be used to energise any of the LED flags. ©2013 Siemens Protection Devices Limited Chapter 4 Page 17 of 20...

  • Page 66: Data Storage Menu

    The relay has two external connections to COM port 2 – via the rear fibre optic connection or via the front RS232 connection. This defines which port is used. When set as auto-detect it will switch between ports depending on the connected devices. ©2013 Siemens Protection Devices Limited Chapter 4 Page 18 of 20...

  • Page 67: Fault Locator Menu

    Defines whether the distance is displayed as a distance or as a percentage of the Pos Seq Line Impedance setting. Fault Locator Enabled/ Disabled Allows the fault locator to be enabled or disabled. ©2013 Siemens Protection Devices Limited Chapter 4 Page 19 of 20...
  • Page 68 OUTPUT RELAYS OUTPUT RELAYS DATA STORAGE MENU. TO VIEW NUM WAVEFORM RECORDS NUM EVENT RECORDS COMMUNICATIONS MENU. TO VIEW TIME & DATE FAULT LOCATOR MENU. TO VIEW Menu Structure ©2013 Siemens Protection Devices Limited Chapter 4 Page 20 of 20...
  • Page 69 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 70 7SG164 Ohmega 400 Series Performance Specification Contents 1 Introduction ................................ 3 2 Technical Specification............................3 Rated Current ............................3 Rated voltage ............................3 Rated Frequency............................3 Characteristic Angle ..........................3 Zone impedance settings ......................... 3 Residual Compensation ........................... 3 Zone 4 Settings ............................3 Voltage Memory ............................

  • Page 71: Introduction

    7SG164 Ohmega 400 Series Performance Specification Introduction The following document defines the technical and performance specification of the standard features in this series of relays. Optional features are described in the last part of the document. Performance Data to: IEC60255-6, IEC60255-6A and IEC60255-16.

  • Page 72: Voltage Memory

    7SG164 Ohmega 400 Series Performance Specification 2.8 Voltage Memory Under fault conditions the relay adds a replica of the positive sequence voltage to the polarising voltage of each comparator. Voltage memory is applied for a maximum of 200ms, after which time the zone 1 and, where fitted, zone 4 comparators will be either inhibited from operating or have their operation latched until the fault is cleared.

  • Page 73: Switch On To Fault

    7SG164 Ohmega 400 Series Performance Specification Output configuration:- Instantaneous operation/reset Minimum delayed alarm 100ms Delayed alarm/reset 0.1 – 60s 3.3 Switch On To Fault Two arrangements provide instantaneous tripping when switching on to a bolted three-phase fault. D.C. Line check This arrangement is energised from the circuit breaker closing circuit and allows instantaneous zone 3 coverage for a period of 400ms after energising the line.

  • Page 74: Optional Features

    7SG164 Ohmega 400 Series Performance Specification Optional Features 7.1 Directional Earth Fault Setting Range Polarising Quantity 1V polarising voltage Characteristics: DTL, IEC-NI, IEC-VI, IEC-EI,IEC-LTI, ANSI-MI, ANSI-VI, ANSI-EI. DEF OverCurrent Setting 0.05 x I to 4 x I in steps of 0.05 DEF IDMTL Characteristic setting 0.05 x In - 4 x In in 0.05 steps.

  • Page 75: Distance Function Reach

    7SG164 Ohmega 400 Series Performance Specification Range 47Hz to 52Hz 57Hz to 62Hz Setting variation ≤ 5% Operating time variation ≤ 5% Harmonic Content Harmonic content of waveforms Frequencies to 550Hz Operating time variation ≤ 5% Auxiliary DC Supply – IEC 60255-11 Allowable superimposed ac component ≤...

  • Page 76: Departure From Reference Setting

    7SG164 Ohmega 400 Series Performance Specification 8.6 Departure from reference setting The class index plus an error not exceeding the class index. 8.7 Departure from reference frequency Over the range of 47 – 52 Hz (50Hz nominal) or 57 – 62 Hz (60Hz nominal), the variations in accuracy are the class index plus an error not exceeding the class index.

  • Page 77: Burdens

    7SG164 Ohmega 400 Series Performance Specification 240A for 2 sec 625A for 1 cycle (Peak) AC Voltage Inputs 3.5Vn Continuous 8.15 Burdens Current Circuits AC Burden (VA per phase) 1A tap 0.025 2A tap 5A tap 0.625 Voltage Circuits 0.01VA per phase NB.

  • Page 78: Environmental Withstand

    7SG164 Ohmega 400 Series Performance Specification ≥ 90% Reset/Operate Voltage Ratio Status Input Performance (110V and 220V) Minimum DC current for operation ≥ 90% Reset/Operate Voltage Ratio NB Status operating voltage need not be the same as the main energising voltage. 48/54 volt rated status inputs...
  • Page 79 7SG164 Ohmega 400 Series Performance Specification 20MHz to 1000MHz, 10V/m ≤ 5% Fast Transient – IEC 60255-22-4 Class IV Variation ≤ 3% 4kV 5/50ns 2.5kHz repetitive Vibration (Sinusoidal) –IEC 60255-21-1 Class 1 Variation Vibration response 0.5gn ≤ 5% Vibration endurance 1.0gn...
  • Page 80 7SG164 Ohmega 400 Series Performance Specification Ohmega 400 Series operating time Phase to Earth Faults SIR = 0.1 SIR = 1.0 SIR = 10 SIR = 30 Fault Position % Figure 1 Ohmega 400 Series operating time Phase to Phase Faults SIR = 0.1...
  • Page 81 7SG164 Ohmega 400 Series Performance Specification Ohmega 400 Series operating time Three Phase Faults SIR = 0.1 SIR = 1.0 SIR = 10 SIR = 30 Fault Position % Figure 3 Accuracy Mho Characteristic 1000 Figure 4 ©2011 Siemens Protection Devices Limited...
  • Page 82 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 83 7SG164 Ohmega 400 Series Communications Interface Contents 1 Introduction ..............................3 2 Connection Specification And Relay Settings ....................4 Recommended cable ..........................4 Connection Method ..........................4 Transmission Method..........................4 Transmission Rate ..........................4 Line Idle Setting ............................. 4 Parity Setting............................4 Address Setting............................
  • Page 84 7SG164 Ohmega 400 Series Communications Interface 1 Introduction The Communication Interface module in the relay incorporates the following ports: An IRIG-B input for time synchronisation A pair of fibre optic ST connectors for transmit and receive communications (port 1). A pair of fibre optic ST connectors as for (2) but intended for transmit and receive communications to a substation SCADA or integrated control system and using IEC 60870-5-103 protocol.
  • Page 85 7SG164 Ohmega 400 Series Communications Interface 2 Connection Specification And Relay Settings This section defines the connection medium as defined by IEC 870-5-103. Appendix A shows some typical communication connections. 2.1 Recommended cable 200μm Plastic Coated Silica (PCS) or 62.5/125μm glass. All cables should be terminated with ST connectors.
  • Page 86 7SG164 Ohmega 400 Series Communications Interface setting (see section 2.6) to allow use of easily available and relatively inexpensive commercial modems has been provided. The downside to this is that the data security will be reduced slightly, and the system will not be compatible with true IEC60870 control systems.
  • Page 87 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 88 7SG164 Ohmega 400 Series Applications Contents 1 Introduction ..............................3 2 Current Transformer Requirements........................3 3 Determination of Relay Settings ........................4 Information Required For The Setting Calculations ................4 Distance Protection Settings ........................4 3.2.1 Overall Settings..........................4 3.2.2 Residual Compensation Settings.

  • Page 89: Introduction

    7SG164 Ohmega 400 Series Applications 1 Introduction This family of Digital Distance Relays give full scheme protection with independent measurements for every zone and fault loop. Impedance starting elements are not required. Optional features provide a full range of protection functions supplements by control, metering, data storage, fault locator, auto-reclose and fibre optic data communication capabilities.

  • Page 90: Determination Of Relay Settings

    7SG164 Ohmega 400 Series Applications 3 Determination of Relay Settings 3.1 Information Required For The Setting Calculations To match a distance protection relay to a feeder the following data must be known:- • Positive sequence of the feeder Z ohm/km •...

  • Page 91: Zone 1 Impedance Setting

    7SG164 Ohmega 400 Series Applications 3.2.3 Zone 1 Impedance Setting Normal practice is to make the Zone 1 setting equal to 80% of the positive sequence impedance of the protected feeder to allow for the inherent errors in estimating line impedance’s and possible errors in voltage and current transformers.

  • Page 92: Zone 3 Impedance Setting

    7SG164 Ohmega 400 Series Applications OHMS OHMS OHMS The Zone 2 reach is obtained by adjusting the impedance setting. ⎡ ⎛ + ⎤ ⎞ ≥ ⎜ ⎟ Zone Setting ⎢ ⎥ ⎝ ⎠ ⎣ ⎦ The Zone 2 Resistance setting for earth fault quad characteristics is set to give an adequate resistive cover to allow for tower footing resistance and arc resistance.

  • Page 93: Zone 4 Impedance Setting

    7SG164 Ohmega 400 Series Applications OHM S OHM S 3.2.6 Zone 4 Impedance Setting The Zone 4 setting has an independent impedance range the line angle is the mirror image of the forward angle and is not independently adjustable. The Zone 4 impedance element can be used to directly trip the relay or it can be used with the scheme logic to provide reverse looking fault detection for protection blocking schemes.

  • Page 94: Appendix A Status Inputs

    7SG164 Ohmega 400 Series Applications APPENDIX A Status Inputs As stated in the “Performance Specification” (section 5 of this manual), status inputs used for protection signalling are high speed devices with operating times of under 5ms. As supplied, all status inputs are of this type.
  • Page 95 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 96 7SG164 Ohmega 400 Series Installation Contents 1 Unpacking, Storage and Handling........................3 2 Recommended Mounting Position........................3 3 Relay Dimensions .............................. 3 4 Fixings................................3 Crimps..............................3 Panel Fixing Screws..........................3 Communications ............................4 5 Ancillary Equipment............................4 6 Precautions ................................ 4 ©2011 Siemens Protection Devices Limited...
  • Page 97 As there are no user serviceable parts in any module, there should be no requirement to remove any component parts. If any component parts have been removed or tampered with, then the guarantee will be invalidated. Siemens reserve the right to charge for any subsequent repairs.
  • Page 98 7SG164 Ohmega 400 Series Installation 2104F70040 – 4 off • Nut M4 2103F11040 – 4 off 4.3 Communications ST fibre optic connections – 4 per relay (Refer to section 4 – Communications Interface). 5 Ancillary Equipment The relay can be interrogated locally or remotely by making connection to the fibre optic terminals on the rear of the relay or the RS232 port on the relay fascia.
  • Page 99 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 100 Power swing transit timer. 4.4.3 Power swing blocking function. AUXILIARY PROTECTION TESTS Fault Locator High Set Overcurrent Stub Protection Zone 2 Override. END TO END TESTING Distance Scheme Tests. APPENDIX A ©2010 Siemens Protection Devices Limited Chapter 9 Page 2 of 19...
  • Page 101 See the relevant schematic diagrams for the relay connections. 1.3.2 System Parameters Enter the system Parameters in the table below; ©2010 Siemens Protection Devices Limited Chapter 9 Page 3 of 19...
  • Page 102 48/54 volt rated will be supplied with external dropper resistor as follows:- Nominal Voltage Resistor Value; Wattage 2k7 ±5%; 2.5 W 110/125 Checked 8k2 ±5%; 6W 220/250 ©2010 Siemens Protection Devices Limited Chapter 9 Page 4 of 19...
  • Page 103 OUTPUT CHECKED NOTES Note: when finished testing the output relays make sure that the ‘Relay healthy’ is re-assigned to the correct output relay given in the settings file. Checked ©2010 Siemens Protection Devices Limited Chapter 9 Page 5 of 19...
  • Page 104 Apply A.C. current to each current input circuit of the relay using a variable current source. The relay should display the correct value of current, the value measured by the relay is displayed in the Instrument Menu; with ± 5% accuracy. Checked ©2010 Siemens Protection Devices Limited Chapter 9 Page 6 of 19...
  • Page 105 Type Impedance (Ω) Zone 1 Zone 2 Zone 3 Zone 3 (Reverse) Ensure that the error does not exceed ± 5%, or ± 0.15 Ω, (whichever is larger) Checked ©2010 Siemens Protection Devices Limited Chapter 9 Page 7 of 19...
  • Page 106 Fault Setting Type Impedance (Ω) Zone 1 Zone 2 Zone 3 Zone 3 (Reverse) Ensure that the error does not exceed ± 5%, or ±0.15 Ω, (whichever is larger) Checked ©2010 Siemens Protection Devices Limited Chapter 9 Page 8 of 19...
  • Page 107 Impedance (Ω) Earth Fault Zone 1 Phase Fault Earth Fault Zone 2 Phase Fault Earth Fault Zone 3 Phase Fault Check operating time is ≤ 50ms for SIR ≤30 Checked ©2010 Siemens Protection Devices Limited Chapter 9 Page 9 of 19...
  • Page 108 Select the pre-fault time to 1 second. Ensure that the status input CB Manual Close is low, then simulate a fault within Zone 3 and outside Zone 1. Record the trip time and indication. ©2010 Siemens Protection Devices Limited Chapter 9 Page 10 of 19...
  • Page 109 Voltage to operate/reset Current to operate/reset Voltage to operate/reset Current to operate/reset Voltage to operate/reset Current to operate/reset Ensure that the VTS picks up at the correct level. Checked ©2010 Siemens Protection Devices Limited Chapter 9 Page 11 of 19...
  • Page 110 In this case there will be no zero sequence current, although a fault has occurred. The relay will see residual voltage but no residual current and prevent tripping. VTS Phase Fault Inhibit : Enable NO TRIP VTS Phase Fault Inhibit : Disable TRIP ©2010 Siemens Protection Devices Limited Chapter 9 Page 12 of 19...
  • Page 111 This should be repeated for the outer reverse reach where applicable. Element Measured Impedance % Error Outer Zone Forward Reach Outer Zone Forward Reach Checked Ensure that the percentage error does not exceed ± 5% ©2010 Siemens Protection Devices Limited Chapter 9 Page 13 of 19...
  • Page 112 This is repeated, altering state 2 to bring the impedance within Zone 1 and 2. Check that in zones which are blocked, the protection doesn’t operate, and those which are not blocked the protection does operate. Unblocked Blocked Checked Zone 1 Zone 2 Zone 3 ©2010 Siemens Protection Devices Limited Chapter 9 Page 14 of 19...
  • Page 113 Nominal Current High Set x In Calculated Pick- Measured Pick- Relay Operation up[A] up[A] Trip HSOC ©2010 Siemens Protection Devices Limited Chapter 9 Page 15 of 19...
  • Page 114 Energise the Zone 2 Override Status Input and repeat the fault. Record the fault type, trip time and relay indication in the table below; Status Input Fault Trip Time Relay Indication Type (ms) De-Energised Zone 2 Trip Energised Zone 2 Override ©2010 Siemens Protection Devices Limited Chapter 9 Page 16 of 19...
  • Page 115 2 element has occurred. Fault Status Inputs Expected Response Relay Operation Zone 2 Remote end Relay trips Zone 1 signal send 1 Relay Autorecloses high. Signal sent – Channel 1 ©2010 Siemens Protection Devices Limited Chapter 9 Page 17 of 19...
  • Page 116 Total Loop Current Phase Voltage Phase Impedance Impedance Injected Angle Injected Angle Zone 3 (Rev) Phase Effective Total Loop Current Phase Voltage Phase Impedance Impedance Injected Angle Injected Angle ©2010 Siemens Protection Devices Limited Chapter 9 Page 18 of 19...
  • Page 117 Total Loop Current Phase Voltage Phase Impedance Impedance Injected Angle Injected Angle Zone 3 (Rev) Phase Effective Total Loop Current Phase Voltage Phase Impedance Impedance Injected Angle Injected Angle ©2010 Siemens Protection Devices Limited Chapter 9 Page 19 of 19...
  • Page 118 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 119 7SG164 Ohmega 400 Series Commissioning Contents 1 Commissioning..............................3 Required Test Equipment ........................3 2 Inspection................................. 3 3 Applying Settings.............................. 3 4 Precautions ..............................3 5 Tests ................................3 Insulation..............................3 Secondary Injection ..........................4 Primary Injection ............................ 4 Load Checks ............................5 Tripping Tests ............................

  • Page 120: Commissioning

    7SG164 Ohmega 400 Series Commissioning 1 Commissioning A separate commissioning guide is available for each model of the relay which details the testing of each function. 1.1 Required Test Equipment 1000V Insulation resistance test set. Digitally controlled automatic test equipment suitable for distance relay testing (3 phase o/ps)

  • Page 121: Secondary Injection

    LED, or no LED light indicates faulty equipment. As there are no user serviceable components in the withdrawable modules, faulty relays must be returned to Siemens. Using the automatic test equipment, inject 1 amp 3 phase into the current circuits of the relay and apply 63.5 volts 3 phase to the voltage circuits.

  • Page 122: Load Checks

    7SG164 Ohmega 400 Series Commissioning • Inject at least 50% of the rated primary current into the red phase (figure 1b). Record the ammeter readings in Table 1. Check that:- • Meters A, A1, A4 and relay meter readings Ia and Ix give the same reading.

  • Page 123: Putting Into Service

    7SG164 Ohmega 400 Series Commissioning operations occur correctly. If possible, using a P.C. or laptop computer loaded with Reydisp Evolution software, check the current and voltage waveforms and relay operations. For phase-earth faults, check that correct tripping as per scheme is obtained i.e. either single pole tripping or three pole tripping with the associated control operations.
  • Page 124 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 125 7SG164 Ohmega 400 Series Maintenance Contents 1 Maintenance Instructions ........................... 3 2 Trouble Shooting Guide ............................. 4 3 Defect Report Form............................6 ©2011 Siemens Protection Devices Limited Chapter 10 Page 2 of 6...
  • Page 126 7SG164 Ohmega 400 Series Maintenance 1 Maintenance Instructions The relay is a maintenance free device, with no user serviceable parts. During the life of the relay it should be checked for operation during the normal maintenance period for the site on which the product is installed. It is...
  • Page 127 7SG164 Ohmega 400 Series Maintenance 2 Trouble Shooting Guide The following table describes the action of the relay under various conditions, and suggested remedial actions when problems are encountered. If problems are being experienced and the suggested action does not work, or the problem is not detailed below, then please contact Siemens.
  • Page 128 7SG164 Ohmega 400 Series Maintenance SYMPTOM PROBLEM ACTION Relay unable to communicate using Communication Ensure connection between PC and relay Reydisp Evolution software channel incorrectly (either via the front RS232 port or TX2 and configured. RX2 on the rear of the relay) has been correctly made.
  • Page 129 Na me, f irst nam e S treet, n umb er P ostco de, city, co untry Da te , Signature Please contact the Siemens representative office in your country to obtain return instructions. ©2011 Siemens Protection Devices Limited Chapter 10 Page 6 of 6...
  • Page 130 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 131 7SG1641 Ohmega 402 60 Diagrams Contents Relay Connections Overall dimensions and panel drilling for Epsilon E16 Reylogic Diagrams. Distance Protection Auxilary Functions Protection Schemes ©2011 Siemens Protection Devices Limited Chapter 11 Page 2 of 18...
  • Page 132 7SG1641 Ohmega 402 60 Diagrams 1 Relay Connections ©2011 Siemens Protection Devices Limited Chapter 11 Page 3 of 18...
  • Page 133 7SG1641 Ohmega 402 60 Diagrams 2 Overall dimensions and panel drilling for Epsilon E16 ©2011 Siemens Protection Devices Limited Chapter 11 Page 4 of 18...
  • Page 134 The following diagrams show the logic used in the relay. This is split up into three sections – firstly the logic used for the distance protection function, then the auxiliary function logic, then finally the scheme logic. ©2011 Siemens Protection Devices Limited Chapter 11 Page 5 of 18...
  • Page 135 ENABLEZ4TRIP Generate a general Zone 1 output for alarm and flagging ZONE1 Generate zone starter signals from the instantaneous zone operations ZONE1START ZONE2START ZONE3START ZONE4START BACKUPTRIPFLAG BACKUPTRIP LockoutLatch LATCHLOCKOUT ©2011 Siemens Protection Devices Limited Chapter 11 Page 6 of 18...
  • Page 136 VMEM_RECOVERED VMT_FEEDBACK & DPENABLEOUTPUTLATCH & VMEM_TIMEOUT Output to the distance module VMT_FEEDBACK Now the latch reset signal Output to the distance module LatchResetDelayTimer VMEM_RECOVERED DPRESETOUTPUTLATCH 10 / 1 IF_ALL_OFF ©2011 Siemens Protection Devices Limited Chapter 11 Page 7 of 18...
  • Page 137 Z3PFIH VTSPFI Zone 4 does have memory voltage, so inhibit from all, ie Power Swing, VTS, or Vmem timed out. VTSEFI DEL_VMEM_TIMEOUT Z4EFIH PSD_SWING & PSD_BLOCKZONE4 VTSPFI Z4PFIH DEL_VMEM_TIMEOUT ©2011 Siemens Protection Devices Limited Chapter 11 Page 8 of 18...
  • Page 138 Copy the protection output booleans to local bools for speed/safety HSOCA HSOPA HSOCB HSOPB HSOCC HSOPC Generate an alarm output for the hiset. This is also used later as a 3 pole trip HSOPA HSOPB HISET HSOPC ©2011 Siemens Protection Devices Limited Chapter 11 Page 9 of 18...
  • Page 139 Now use this to evaluate the SOTF logic ACSOTFTIMER PhaseADead PhaseBDead & 10000 / 200 PhaseCDead & & SOTFLSTIMER SOTF_OC_A SOTF_OC_B & 25 / 0 SOTF_OC_C SOTFTRIP & DCSOTFTIMER TRIG_DC_SOTF & 1 / 400 DCSOTFENABLE ©2011 Siemens Protection Devices Limited Chapter 11 Page 10 of 18...
  • Page 140 VTSOV & VTSUC VTS_LATCH & VTSLATCHENABLE VTSAlarmDelay VTS_ACTIVE VTSA 100 / 20 VTSLatchTimer VTSLatch 5000 / 1 VTS_LATCH RESET_VTS_LATCH VTSResetDelay & VTSEFI 0 / 20 VTSMODE & VTSPFI VTSPFMODE ©2011 Siemens Protection Devices Limited Chapter 11 Page 11 of 18...
  • Page 141 See Page Properties for revision history Generate an alarm/flag output for stub operation STUBOUT STUBPROTECTION Qualify the stub outputs for flagging. STUBA & STUBOPA STUBPROTECTION STUBB & STUBOPB STUBPROTECTION STUBC & STUBOPC STUBPROTECTION ©2011 Siemens Protection Devices Limited Chapter 11 Page 12 of 18...
  • Page 142 Finally, w e generate our aided trip signal from signal receive 1, qualified by the lack of a carrier fail signal, stretch the resultant output and use it to qualify the instantaneous zone 2 output SREXTEND CARRIERFAIL & 0 / 1 SIGRECV1 & AIDEDTRIP ©2011 Siemens Protection Devices Limited Chapter 11 Page 13 of 18...
  • Page 143 WILowV1 & PORWeakInf eed EXTSIGRECV1 CBCLOSED & PORWITRIP WITripping ©2011 Siemens Protection Devices Limited Chapter 11 Page 14 of 18...
  • Page 144 & NOCRG SSEXTEND POREcho 1 / 1 SIGSEND1 PORWeakInf eed Aided Trip Logic EXTSIGRECV1 & AIDEDTRIP NOCRG PORWITRIP ©2011 Siemens Protection Devices Limited Chapter 11 Page 15 of 18...
  • Page 145 WILowV1 & PORWeakInf eed EXTSIGRECV1 CBCLOSED & PORWITRIP WITripping ©2011 Siemens Protection Devices Limited Chapter 11 Page 16 of 18...
  • Page 146 We generate a signal to send to the remote relay if w e have Zone 2 picked up but no current reversal guard, or w e have an echo pulse, or w e have a w eak infeed condition. & NOCRG SSEXTEND POREcho 1 / 1 SIGSEND1 PORWeakInf eed Aided Trip Logic EXTSIGRECV1 & AIDEDTRIP NOCRG PORWITRIP ©2011 Siemens Protection Devices Limited Chapter 11 Page 17 of 18...
  • Page 147 Also, generate an output tag so that the CARRIERFAIL signal receive input can generate a flag SREXTEND SIGRECV1 1 / 1 & BLOCKINHIBIT PTTimer & AIDEDTRIP & 20 / 1 ©2011 Siemens Protection Devices Limited Chapter 11 Page 18 of 18...
  • Page 148 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 149 7SG164 Ohmega 400 Series Stub Protection Contents 1 Stub Protection..............................3 2 Settings ................................3 ©2011 Siemens Protection Devices Limited Chapter 12 Page 2 of 4...
  • Page 150 7SG164 Ohmega 400 Series Stub Protection 1 Stub Protection The Stub protection function in the relay is used to protect a short section of bus bar when the plant configuration is such that the line V.T. is switched out of circuit. The relay uses an over current element who’s output is gated with a status input.
  • Page 151 7SG164 Ohmega 400 Series Stub Protection Un protected Zone Figure 2 ©2011 Siemens Protection Devices Limited Chapter 12 Page 4 of 4...
  • Page 152 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 affili- ates, 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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