GE DBF, Instructions Manual

Page: 41 / 65

6. ACCEPTANCE TESTS
34 DBF Breaker Failure Protection GEK-106168E
6.9.2 50BF 3P UNIT TEST
The DBF relay outputs are factory set with the default settings shown in the external connections drawing (Figure
2).
1. Change setpoint GENERAL/FUNCTION PERMIT/50BF 1P FUNCTION to NO PER.
2. Change setpoint GENERAL/FUNCTION PERMIT/50BF 3P FUNCTION to PER.
3. Change setpoint GENERAL/FUNCTION PERMIT/3P No INT FUNCT to NO PER.
4. Change setpoint TABLE 1/50BF SETTINGS/Nº OUTPUT STAGES to 2.
5. Change setpoint TABLE 1/50BF SETTINGS/BF Logic (3P/2P) to 3 PHASE.
6. The precision timer will be started at the same time than the corresponding contact converter (digital input) is
energized. The timer stop input will be wired to any DBF contact under test, i.e. contact C4-D4.
7. Apply 3A to terminals A1-A2 (phase A), B1-B2 (phase B) and A3-A4 (phase C).
8. Energize digital input CC7 3 POLE BF INITIATE (if the relay has not an expansion board, energize digital
inputs CC1 PHASE A BF INITIATE and CC2 PHASE B BF INITIATE simultaneously).
9. Check that after T2 time delay (1s), the following contacts are closed:
A12-B12
C4-D4
C5-D5
10. Check that after 2nd Stage Timer delay (2s), the following contacts are closed:
C1-D1
C6-D6
C7-D7
11. Change setpoint TABLE 1/50BF SETTINGS/Nº OUTPUT STAGES to 1.
12. Repeat steps 8 to 9. Check that after T2 time delay (1s), all the contacts are closed:
A12-B12 C1-D1
C4-D4 C6-D6
C5-D5 C7-D7
13. Change setpoint TABLE 1/50BF SETTINGS/BF LOGIC (3P/2P) to 2 PHASE.
14. Apply 3A to terminals B1-B2 (phase B) and terminals A3-A4 (phase C).
15. Energize digital inputs CC2 PHASE B BF INITIATE and CC3 PHASE C BF INITIATE.
16. Check that after T2 time delay (1s), the following contacts are closed:
A12-B12 C1-D1
C4-D4 C6-D6
C5-D5 C7-D7
17. Repeat steps 15 to 17 choosing any other pair of phases to apply ac current and any other pair of BF initiation
inputs.