GE Feeder Management Relay 750 User Manual

GE Multilin 750/760 Feeder Management Relay 8-45
8 COMMISSIONING TESTS 8.6 CONTROL SCHEMES
8
13. Arrange the interval timer to start on appearance of voltage and stop when the Close Relay operates.
14. Turn the voltage off to cause an Undervoltage 1 trip, then reset the timer.
15. Turn the voltage on. The Close Relay should operate after the delay programmed in setpoint Undervolt Restore Delay.
16. If the Undervoltage 2 initiation is to be checked change the Undervoltage Restoration function setpoint to "Disabled",
Undervoltage 1 function to "Disabled", Undervoltage 2 function to "Trip" and repeat Steps 2 through 7.
a) FOR WYE VTS
Make the test connections specified in Figure 8–1: Relay Test Wiring – Wye Connection on page 8–3. The following proce-
dure checks Minimum Voltage with One Phase For Operation:
1. Assert or De-assert a logic input to simulate an open breaker.
2. Set
UNDERVOLT RESTORE DELAY to "0".
3. Inject V
an
= V
bn
= V
cn
= nominal voltage into the bus voltage input of the relay.
4. Reduce the injected voltages to cause an undervoltage trip, then set V
bn
and V
cn
to "0".
5. Slowly raise V
an
until the Close Relay operates. This is the operating level of the UNDERVOLT RESTORE MIN VOLTS set-
point for V
an
.
6. Repeat Steps 3 through 5 except adjust V
bn
and V
cn
in turn.
The following procedure checks Minimum Voltage with Two Phases For Operation:
1. Assert or De-assert a logic input to simulate an open breaker.
2. Set
UNDERVOLT RESTORE DELAY to "0".
3. Inject V
an
= V
bn
= V
cn
= nominal voltage into the bus voltage input of the relay.
4. Reduce the injected voltages to cause an undervoltage trip, then set V
bn
to 0 and Vcn to nominal.
5. Slowly raise V
an
until the Close Relay operates. This is the operating level of the UNDERVOLT RESTORE MIN VOLTS set-
point for V
an
with V
cn
.
6. Inject V
an
= V
bn
= V
cn
= nominal voltage into the bus voltage input of the relay.
7. Reduce the injected voltages to cause an undervoltage trip, then set V
cn
to 0 and V
bn
to nominal.
8. Slowly raise V
an
until the Close Relay operates. This is the operating level of the UNDERVOLT RESTORE MIN VOLTS set-
point for V
an
with V
bn
.
9. Inject V
an
= V
bn
= V
cn
= nominal voltage into the bus voltage input of the relay.
10. Reduce the injected voltages to cause an undervoltage trip, then set V
cn
to 0 and V
an
to nominal.
11. Slowly raise V
bn
until the Close Relay operates. This is the operating level of the UNDERVOLT RESTORE MIN VOLTS set-
point for V
bn
with Van.
12. Inject V
an
= V
bn
= V
cn
= nominal voltage into the bus voltage input of the relay.
13. Reduce the injected voltages to cause an undervoltage trip, then set V
an
to 0 and V
cn
to nominal.
14. Slowly raise V
bn
until the Close Relay operates. This is the operating level of the UNDERVOLT RESTORE MIN VOLTS set-
point for V
bn
with V
cn
.
15. Inject V
an
= V
bn
= V
cn
= nominal voltage into the bus voltage input of the relay.
16. Reduce the injected voltages to cause an undervoltage trip, then set V
an
to 0 and V
bn
to nominal.
17. Slowly raise V
cn
until the Close Relay operates. This is the operating level of the UNDERVOLT RESTORE MIN VOLTS set-
point for V
cn
with V
bn
.
18. Inject V
an
= V
bn
= V
cn
= nominal voltage into the bus voltage input of the relay.
19. Reduce the injected voltages to cause an undervoltage trip, then set V
bn
to 0 and V
an
to nominal.
20. Slowly raise V
cn
until the Close Relay operates. This is the operating level of the UNDERVOLT RESTORE MIN VOLTS set-
point for V
cn
with V
an
.
Courtesy of NationalSwitchgear.com

GE Feeder Management Relay 750 Specifications

General

Brand	GE
Model	Feeder Management Relay 750
Category	Protection Device
Language	English