High-Set Phase Overcurrent - GE 489 Instruction Manual

4.6 S5 CURRENT ELEMENTS
GROUNDING SWITCH
59G
4
TO Vneutral OF EACH 489
T
HIGH-SET PHASE O/C
T
[ENTER] for more
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.
4-28
AUXILIARY
CONTACT
Figure 4–5: GROUND DIRECTIONAL DETECTION
ð
HIGH-SET PHASE O/C
ENTER
TRIP: Off
ESCAPE
ASSIGN TRIP
ESCAPE
RELAYS (1-4): 1---
MESSAGE
HIGH-SET PHASE O/C
ESCAPE
PICKUP: 5.00 x CT
MESSAGE
HIGH-SET PHASE O/C
ESCAPE
DELAY: 1.00 s
MESSAGE
489 Generator Management Relay
4 SETPOINT PROGRAMMING
C(B)
C(B)
A
A
B(C)
B(C)

4.6.10 HIGH-SET PHASE OVERCURRENT

Range: Off, Latched, Unlatched
Range: Any combination of Relays 1 to 4
Range: 0.15 to 20.00 x CT in steps of 0.01
Range: 0.00 to 100.00 s in steps of 0.01
I0
TO 50:0.025
50:0.025 GROUND
INPUTS
808812A3.CDR
GE Power Management