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GE Power Management
469 Motor Management Relay
7-13
7 TESTING
7.3 ADDITIONAL FUNCTIONAL TESTING
7
7.3.5 SHORT CIRCUIT TEST
The 469 specification for short circuit timing is +50 ms. The pickup accuracy is as per the phase current inputs.
Perform the steps below to verify the performance of the short circuit element.
1.
Alter the following setpoints:
S2 SYSTEM SETUP\CURRENT SENSING\PHASE CT PRIMARY:
1000
S6 CURRENT ELEMENTS\SHORT CIRCUIT TRIP\SHORT CIRCUIT TRIP:
On
S6 CURRENT ELEMENTS\SHORT CIRCUIT TRIP\ASSIGN TRIP RELAYS:
Trip
S6 CURRENT ELEMENTS\SHORT CIRCUIT TRIP\SHORT CIRCUIT TRIP PICKUP:
5.0
×
CT
S6 CURRENT ELEMENTS\SHORT CIRCUIT TRIP\INTENTIONAL S/C DELAY:
0
2.
Inject current as per the table below, resetting the unit after each trip by pressing the
key, and verify
timing accuracy. Pre-trip values may be viewed by pressing
after each trip.
Table 7–18: SHORT CIRCUIT TIMING
INJECTED CURRENT
EXPECTED TIME
TO TRIP
MEASURED TIME
TO TRIP
5 A UNIT
1 A UNIT
30 A
6 A
< 50 ms
40 A
8 A
< 50 ms
50 A
10 A
< 50 ms
RESET
NEXT
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