System Setup; General Settings; Flex Curves - GE Multilin G650 Manual

5.3 SYSTEM SETUP

5.3SYSTEM SETUP
This section shows the settings related to the system setup definition.
This section determines the settings of the element configuration regarding its connection to the power system.
Access to these settings using the EnerVista 650 Setup software is at Setpoint > System Setup > General settings.
The corresponding settings are shown on the table below:
Table 5–20: GENERAL SETTINGS
SETPOINT > SYSTEM SETUP > GENERAL SETTINGS
setting Description
Phase CT ratio
Ground CT ratio
Sensitive ground CT ratio
Phase VT ratio
Phase VT connection
Rated voltage
Rated Frequency
Phase rotation
Frequency reference
Auxiliary Voltage
5 Snapshot Event generation
Frequency Tracking
The system rated voltage is used as reference by the voltage restraint in the phase timed overcurrent element.
The Frequency reference marks the voltage channel to which the system Frequency is measured.
The auxiliary voltage setting can be selected between VG , VNand VX.
VX means that all elements using neutral voltage will take the value calculated from phase voltages.
and the synchrocheck function will measure the busbar voltage from the fourth voltage input. 25, 27X and 59X units will be
operative.
VN means that the neutral voltage is directly measured from the fourth voltage transformer. All elements using neutral volt-
age will take the value measured from the fouth voltage input. Measurements of single phase power value will be available
in delta connection. 25, 27X and 59X, 59G units will not be operative.
VG means that the ground voltage is directly measured from the fourth voltage transformer.
This means that all elements using neutral voltage will take the value calculated from phase voltages.
Measurements of single phase power value will not be available in delta connection as they cannot be duly calculated. 25,
27X and 59X units will not be operative. 67N and 67G functions will work only will calculated values from phases, so if volt-
age inputs are configured in delta connection this unit will not be operative.
59G function will be operative.
The relay incorporates 4 user curves called Flex Curve A, B, C and D. The points for these curves are defined by the user
in "Setpoint>System Setup>Flex Curves" menu in EnerVista 650 Setup. User defined flex curves can be selected as an
operation curve in all the time overcurrent functions in the relay.
5-20
Name Default Value
Phase CT Ratio 1.0
Ground CT Ratio 1.0
Stv Ground CT Ratio 1.0
Phase VT Ratio 1.0
Phase VT Connection WYE
Nominal Voltage 100.0
Nominal Frequency 50 Hz
Phase Rotation ABC
Frequency Reference VI
Auxiliary Voltage VX
Snapshot Events DISABLED
Freq Tracking DISABLED
G650 Generator Protection & Control System
5 SETTINGS

5.3.1 GENERAL SETTINGS

Step Range
0.1 [1.0 : 6000.0]
0.1 [1.0 : 6000.0]
0.1 [1.0 : 6000.0]
0.1 [1.0 : 6000.0]
N/A [WYE – DELTA]
0.1 [1.0 : 500.0]
N/A [50-60]
N/A [ABC – ACB]
N/A [VI-VII-VIII]
N/A [VX -VN- VG]
N/A [DISABLED – ENABLED]
N/A [DISABLED – ENABLED]

5.3.2 FLEX CURVES

GEK-113285A