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8 COMMISSIONING TESTS
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
3.
Inject V
= V
= V
an
bn
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 the
an
point for V
.
an
6.
Repeat Steps 3 through 5 except adjust V
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
3.
Inject V
= V
= V
an
bn
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 the
an
point for V
with V
an
6.
Inject V
= V
= V
an
bn
7.
Reduce the injected voltages to cause an undervoltage trip, then set V
8.
Slowly raise V
until the Close Relay operates. This is the operating level of the
an
point for V
with V
an
9.
Inject V
= V
= V
an
bn
10. Reduce the injected voltages to cause an undervoltage trip, then set V
11. Slowly raise V
until the Close Relay operates. This is the operating level of the
bn
point for V
with Van.
bn
12. Inject V
= V
= V
an
bn
13. Reduce the injected voltages to cause an undervoltage trip, then set V
14. Slowly raise V
until the Close Relay operates. This is the operating level of the
bn
point for V
with V
bn
15. Inject V
= V
= V
an
bn
16. Reduce the injected voltages to cause an undervoltage trip, then set V
17. Slowly raise V
until the Close Relay operates. This is the operating level of the
cn
point for V
with V
cn
18. Inject V
= V
= V
an
bn
19. Reduce the injected voltages to cause an undervoltage trip, then set V
20. Slowly raise V
until the Close Relay operates. This is the operating level of the
cn
point for V
with V
cn
GE Multilin
Courtesy of NationalSwitchgear.com
to "0".
= nominal voltage into the bus voltage input of the relay.
cn
and V
bn
to "0".
= nominal voltage into the bus voltage input of the relay.
cn
.
cn
= nominal voltage into the bus voltage input of the relay.
cn
.
bn
= nominal voltage into the bus voltage input of the relay.
cn
= nominal voltage into the bus voltage input of the relay.
cn
.
cn
= nominal voltage into the bus voltage input of the relay.
cn
.
bn
= nominal voltage into the bus voltage input of the relay.
cn
.
an
750/760 Feeder Management Relay
and V
bn
cn
in turn.
cn
to 0 and Vcn to nominal.
bn
to 0 and V
cn
to 0 and V
cn
to 0 and V
an
to 0 and V
an
to 0 and V
bn
8.6 CONTROL SCHEMES
to "0".
UNDERVOLT RESTORE MIN VOLTS
UNDERVOLT RESTORE MIN VOLTS
to nominal.
bn
UNDERVOLT RESTORE MIN VOLTS
to nominal.
an
UNDERVOLT RESTORE MIN VOLTS
to nominal.
cn
UNDERVOLT RESTORE MIN VOLTS
to nominal.
bn
UNDERVOLT RESTORE MIN VOLTS
to nominal.
an
UNDERVOLT RESTORE MIN VOLTS
set-
set-
set-
set-
8
set-
set-
set-
8-45
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