GE Feeder Management Relay 750 User Manual

8-46 750/760 Feeder Management Relay GE Multilin
8.6 CONTROL SCHEMES 8 COMMISSIONING TESTS
8
The following procedure checks Minimum Voltage with Three 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
an
and V
cn
to nominal.
5. Slowly raise V
an
until the Close Relay operates. This is the operating level of UNDERVOLT RESTORE MIN VOLTS for V
an
.
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
an
and V
cn
to nominal.
8. Slowly raise V
bn
until the Close Relay operates. This is the operating level of UNDERVOLT RESTORE MIN VOLTS for 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
an
and V
bn
to nominal.
11. Slowly raise V
cn
until the Close Relay operates. This is the operating level of UNDERVOLT RESTORE MIN VOLTS for V
cn
.
b) FOR DELTA VTS
Make the test connections specified in Figure 8–2: Relay Test Wiring – Delta 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
ab
= V
cb
= nominal voltage into the bus voltage input of the relay.
4. Reduce the injected voltages to cause an undervoltage trip, then set V
cb
to 0 V.
5. Slowly raise V
ab
until the Close Relay operates. This is the operating level of UNDERVOLT RESTORE MIN VOLTS for V
ab
.
6. Repeat Steps 3 through 5 except adjust V
cb
.
The following procedure checks Pickup with Two or Three 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
ab
= V
cb
= nominal voltage into the bus voltage input of the relay.
4. Reduce the injected voltages to cause an undervoltage trip, then set V
cb
to nominal.
5. Slowly raise V
ab
until the Close Relay operates. This is the operating level of UNDERVOLT RESTORE MIN VOLTS for V
ab
.
6. Inject V
ab
= V
cb
= nominal voltage into the bus voltage input of the relay.
7. Reduce the injected voltages to cause an undervoltage trip, then set V
ab
to nominal.
8. Slowly raise V
cb
until the Close Relay operates. This is the operating level of UNDERVOLT RESTORE MIN VOLTS for V
cb
.
8.6.6 UNDERFREQUENCY RESTORATION
Make the test connections specified in Figure 8–1: Relay Test Wiring – Wye Connection or Figure 8–2: Relay Test Wiring –
Delta Connection on page 8–3. The following procedure checks Logic and Timers for Underfrequency Restoration:
1. Program the
UNDERFREQ 1 FUNCTION as “Trip”, MIN VOLTAGE as “0”, and UNDERFREQ 2 FUNCTION as “Disabled”.
2. Assert or De-assert a logic input to simulate a closed breaker.
3. Inject a voltage at nominal voltage and frequency into the bus voltage Phase A input.
4. Initially set
UNDERFREQ RESTORATION setpoint to Alarm, and other setpoints as required.
5. Reduce the frequency to below the underfrequency pickup level. After the programmed delay Underfrequency 1
should cause a trip, which should not initiate underfrequency restoration as the breaker is closed. Diagnostic message
"Ufreq Restore Init" should not be displayed.
Courtesy of NationalSwitchgear.com

GE Feeder Management Relay 750 Specifications

General

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