GE DBF, Instructions Manual

Page: 44 / 65

6. ACCEPTANCE TESTS
GEK-106168E DBF Breaker Failure Protection 37
6.10. RELAY MEASUREMENT TESTS
6.10.1. CURRENT MEASUREMENT
1. Change setpoint GENERAL/FUNCTION PERMIT/50BF 1P FUNCTION to PER.
2. Change setpoint GENERAL/FUNCTION PERMIT/50BF 3P FUNCTION to NO PER.
3. Change setpoint GENERAL/FUNCTION PERMIT/3P No INT FUNCT to NO PER.
4. Change setpoint TABLE 1/50BF SETTINGS/PH LOSET PICKUP to 5A (1A in relays with 1A nominal current).
5. Change setpoint TABLE 1/50BF SETTINGS/1 PHASE TIMER T1 to 0.050s.
6. Change setpoint TABLE 1/50BF SETTINGS/Nº OUTPUT STAGES to 1.
7. Energize digital input 3POLE BF INITIATE (terminals E7-E8 for relays with expansion board). If the relay has
not expansion board, energize CC1 PHASE A BF INITIATE.
8. Increase current applied on A1-A2 (phase A) until contact A12-B12 closes. Check that the operating value of
the current is within
±
5% of setpoint (5A for relays with 5A nominal current and 1A for 1A nominal current
relays).
9. Repeat step 8 applying current on B1-B2 (phase B). If the relay has not an expansion board energize CC2
PHASE B BF INITIATE.
10. Repeat step 8 applying current on A3-A4 (phase C). If the relay has not an expansion board energize CC3
PHASE C BF INITIATE.
6.10.2. TIMING MEASUREMENT
1. Connect the stop input of the precision timer to the A12-B12 output (trip 1).
2. Apply the operating current level of the previous test to terminals A1-A2 (phase A).
3. Simultaneously energize the digital input 3POLE BF INITIATE and the starting input of the precision timer.
4. After 1 PHASE TIMER T1 (0.050s) the relay will trip.
5. Verify that the actual operating time is equal to 1 PHASE TIMER T1 (accuracy
±
5% or 30 ms, whichever is
greater).