GE 750 Instruction Manual page 305
Feeder management relay
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10. Reduce the injected voltages to cause an undervoltage trip, then set V
and V
to nominal.
an
11. Slowly raise V
until the Close Relay operates. This is the operating level of the
bn
UNDERVOLT RESTORE MIN VOLTS
12. Inject V
= V
= V
an
bn
cn
13. Reduce the injected voltages to cause an undervoltage trip, then set V
and V
to nominal.
cn
14. Slowly raise V
until the Close Relay operates. This is the operating level of the
bn
UNDERVOLT RESTORE MIN VOLTS
15. Inject V
= V
= V
an
bn
cn
16. Reduce the injected voltages to cause an undervoltage trip, then set V
and V
to nominal.
bn
17. Slowly raise V
until the Close Relay operates. This is the operating level of the
cn
UNDERVOLT RESTORE MIN VOLTS
18. Inject V
= V
= V
an
bn
cn
19. Reduce the injected voltages to cause an undervoltage trip, then set V
and V
to nominal.
an
20. Slowly raise V
until the Close Relay operates. This is the operating level of the
cn
UNDERVOLT RESTORE MIN VOLTS
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
3.
Inject V
= V
= V
an
bn
cn
4.
Reduce the injected voltages to cause an undervoltage trip, then set V
to nominal.
5.
Slowly raise V
until the Close Relay operates. This is the operating level of
an
UNDERVOLT RESTORE MIN VOLTS
6.
Inject V
= V
= V
an
bn
cn
7.
Reduce the injected voltages to cause an undervoltage trip, then set V
to nominal.
8.
Slowly raise V
until the Close Relay operates. This is the operating level of
bn
UNDERVOLT RESTORE MIN VOLTS
9.
Inject V
= V
= V
an
bn
cn
10. Reduce the injected voltages to cause an undervoltage trip, then set V
V
to nominal.
bn
11. Slowly raise V
until the Close Relay operates. This is the operating level of
cn
UNDERVOLT RESTORE MIN VOLTS
c) For Delta VTs
Make the test connections specified in FIGURE 7–2: Relay Test Wiring – Delta
Connection on page 7–4. The following procedure 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
3.
Inject V
= V
= nominal voltage into the bus voltage input of the relay.
ab
cb
4.
Reduce the injected voltages to cause an undervoltage trip, then set V
5.
Slowly raise V
until the Close Relay operates. This is the operating level of
ab
UNDERVOLT RESTORE MIN VOLTS
6.
Repeat Steps 3 through 5 except adjust V
The following procedure checks Pickup with Two or Three Phases For Operation:
http://www.GEmultilin.com
setpoint for V
with Van.
bn
= nominal voltage into the bus voltage input of the relay.
setpoint for V
with V
bn
= nominal voltage into the bus voltage input of the relay.
setpoint for V
with V
cn
= nominal voltage into the bus voltage input of the relay.
setpoint for V
with V
cn
to "0".
= nominal voltage into the bus voltage input of the relay.
for V
.
an
= nominal voltage into the bus voltage input of the relay.
for V
.
bn
= nominal voltage into the bus voltage input of the relay.
for V
.
cn
to 0.
for V
.
ab
.
cb
750/760
Feeder Management Relay
to 0
cn
to 0
an
.
cn
to 0
an
.
bn
to 0
bn
.
an
and V
an
cn
and V
an
cn
and
an
to 0 V.
cb
7–51
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