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5 SETPOINTS
PATH: SETPOINTS
S2 SYSTEM SETUP
LINE VT SENSING
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With a Line VT installed, the relay can be used to check for a condition of synchronism between two voltages, either line-
line or line-neutral.
•
VT CONNECTION: Enter the Line VT connection made to the system. This selection is critical to the operation of syn-
chrocheck, as it instructs the relay which Bus VT input voltage is to be compared to the Line VT input voltage. See Fig-
ure 3–14: Line VT Connections on page 3–11 for the system connection to match this setpoint.
•
NOMINAL VT SECONDARY VOLTAGE: This setpoint represents the voltage across the VT secondary winding when
nominal voltage is applied to the primary. On a source of 13.8 kV line-line at nominal voltage, with a 14400:120 V VT in
the Delta connection, the voltage to be entered is 115 V. For the Wye connection, the voltage to be entered is 115 /
= 66.4 V.
•
VT RATIO: Enter the VT primary to secondary turns ratio with this setpoint. For a 14400:120 VT, the entry would be
"120:1" (since 14400 / 120 = 120.0).
PATH: SETPOINTS
S2 SYSTEM SETUP
PWR SYSTEM
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The power system data is entered in this setpoint subgroup.
•
NOMINAL FREQ: Enter the nominal power system frequency. This value is used as a default to set the optimal digital
sampling rate if the system frequency cannot be measured as there is no voltage available at the bus voltage phase A
input terminals.
•
PHASE SEQUENCE: Enter the phase sequence of the power system.
•
COST OF ENERGY: Kilowatt hour power usage is converted to a cost of energy using this setpoint. The cost of energy
charged by a utility is usually a variable rate depending on total energy consumed or other factors. Enter an estimated
average cost in cents per kWh. Approximate energy cost will be determined by the relay, providing a value useful for
budgeting purposes.
GE Multilin
Courtesy of NationalSwitchgear.com
LINE VT SENSING
ð
ENTER
VT CONNECTION:
ESCAPE
Vbn
NOMINAL VT SECONDARY
ESCAPE
MESSAGE
VOLTAGE: 120.0 V
VT RATIO:
ESCAPE
MESSAGE
120.0:1
PWR SYSTEM
ð
NOMINAL FREQ:
ENTER
ESCAPE
60 Hz
PHASE SEQUENCE:
ESCAPE
MESSAGE
ABC
COST OF ENERGY:
ESCAPE
MESSAGE
5.0 ¢/kWh
750/760 Feeder Management Relay
5.3 S2 SYSTEM SETUP
5.3.3 LINE VT SENSING
Range: Van, Vbn, Vcn, Vab, Vcb
Range: 50.0 to 240.0 V in steps of 0.1
Range: 1.0 to 5000.0 in steps of 0.1
5.3.4 POWER SYSTEM
Range: Van, Vbn, Vcn, Vab, Vcb
Range: 50.0 to 240.0 V in steps of 0.1
Range: 1.0 to 25.0 ¢/kWh in steps of 0.1
3
5
5-17
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