GE 750 Instruction Manual page 304
Feeder management relay
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- Instruction manual (504 pages) ,
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750/760
Feeder Management Relay
7–50
7.
Change the Undervoltage Restoration function setpoint to Control, and the
diagnostic message should change to control and the Alarm LED should turn off.
Return this setpoint to Alarm.
8.
Assert logic input Block Restoration. The diagnostic alarm message and LED
should be removed from the display, and any output relays that operated should
reset.
9.
De-assert the logic input. The alarm message and LED should again be
displayed and output relays operated. After the delay programmed in
Incomplete Sequence Time the alarm message and LED should be removed
from the display and output relays reset.
10. Return the reduced voltage to nominal, resetting both the undervoltage trip
condition and undervoltage restoration.
11. Reduce voltage until Undervoltage 1 trips, then immediately return the voltage
to nominal. The diagnostic alarm message and LED should be displayed, and
output relays operated.
12. Provide a Reset to the relay, and the alarm message and LED should be
removed from the display and output relays reset. Remove the Reset.
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.
b) For Wye VTs
Make the test connections specified in FIGURE 7–1: Relay Test Wiring – Wye
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
= V
an
bn
cn
4.
Reduce the injected voltages to cause an undervoltage trip, then set V
V
to "0".
cn
5.
Slowly raise V
until the Close Relay operates. This is the operating level of the
an
UNDERVOLT RESTORE MIN VOLTS
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
cn
4.
Reduce the injected voltages to cause an undervoltage trip, then set V
and Vcn to nominal.
5.
Slowly raise V
until the Close Relay operates. This is the operating level of the
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
and V
to nominal.
bn
8.
Slowly raise V
until the Close Relay operates. This is the operating level of the
an
UNDERVOLT RESTORE MIN VOLTS
9.
Inject V
= V
= V
an
bn
cn
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to "0".
= nominal voltage into the bus voltage input of the relay.
setpoint for V
.
an
and V
bn
to "0".
= nominal voltage into the bus voltage input of the relay.
setpoint for V
with V
an
= nominal voltage into the bus voltage input of the relay.
setpoint for V
with V
an
= nominal voltage into the bus voltage input of the relay.
Control Schemes
and
bn
in turn.
cn
to 0
bn
.
cn
to 0
cn
.
bn
GE Multilin
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