4-28 489 Generator Management Relay
GE Power Management
4.6 S5 CURRENT ELEMENTS 4 SETPOINT PROGRAMMING
4
Figure 4–5: GROUND DIRECTIONAL DETECTION
4.6.10 HIGH-SET PHASE OVERCURRENT
If any individual phase current exceeds the pickup level for the specified trip time a trip will occur if the feature is enabled.
The element operates in both online and offline conditions. This element can be used as a backup feature to other protec-
tion elements. In situations where generators are connected in parallel this element would be set above the maximum cur-
rent contribution from the generator on which the protection is installed. With this setting, the element would provide proper
selective tripping. The basic operating time of the element with no time delay is 50 ms at 50/60 Hz.
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HIGH-SET PHASE O/C
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[ENTER] for more
HIGH-SET PHASE O/C
TRIP: Off
Range: Off, Latched, Unlatched
ASSIGN TRIP
RELAYS (1-4): 1---
Range: Any combination of Relays 1 to 4
HIGH-SET PHASE O/C
PICKUP: 5.00 x CT
Range: 0.15 to 20.00 x CT in steps of 0.01
HIGH-SET PHASE O/C
DELAY: 1.00 s
Range: 0.00 to 100.00 s in steps of 0.01
59G
A
A
C(B)
C(B)
B(C)
B(C)
TO 50:0.025
GROUND
INPUTS
50:0.025
I0
TO Vneutral OF EACH 489
AUXILIARY
CONTACT
GROUNDING SWITCH
808812A3.CDR
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
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