GE Power Management
489 Generator Management Relay 4-21
4 SETPOINT PROGRAMMING 4.6 S5 CURRENT ELEMENTS
4
4.6.4 INADVERTENT ENERGIZATION
The logic diagram for the inadvertent energization protection feature is shown below. The feature may be armed when all of
the phase voltages fall below the undervoltage pickup level
and
the unit is offline. This would be the case when the VTs are
on the generator side of the disconnect device. If however, the VTs are on the power system side of the disconnect device,
the feature should be armed if all of the phase voltages fall below the undervoltage pickup level
or
the unit is offline. When
the feature is armed, if any one of the phase currents measured at the output CTs exceeds the overcurrent level pro-
grammed, a trip will occur.
5 seconds to arm, 250 ms to disarm.
Protection can be provided for poor synchronization by using the "U/V or Offline" arming signal. During normal synchroniza-
tion, there should be relatively low current measured. If however, synchronization is attempted when conditions are not
appropriate, a large current that is measured within 250 ms after the generator is placed online would result in a trip.
Figure 4–1: INADVERTENT ENERGIZATION
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INADVERTENT ENERG.
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[ENTER] for more
INADVERTENT ENERGIZE
TRIP: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM
RELAYS (1-4): 1---
Range: Any combination of Relays 1 to 4
ARMING SIGNAL:
U/V and Offline
Range: U/V and Offline, U/V or Offline
INADVERTENT ENERGIZE
O/C PICKUP: 0.05 x CT
Range: 0.05 to 3.00
×
CT in steps of 0.01
INADVERTENT ENERGIZE
PICKUP: 0.50 x Rated V
Range: 0.50 to 0.99
×
Rated Voltage in steps of 0.01
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
NOTE
ANDAND
ANDAND
ANDAND
OROR
OROR
V < U/V Levelphase
I > O/C Levelphase
Operate
Breaker Status =Off-Line
Arming Signal = U/V or Offline
5s
250 ms
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