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6. ACCEPTANCE TESTS
GEK-106168E DBF Breaker Failure Protection 33
6.9. FUNCTIONS
6.9.1 50BF 1P UNIT TEST
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 TABLE 1/FUNCTION PERMIT/3P No INT FUNCT to NO PER.
4. Change setpoint 50BF SETTINGS/Nº OUTPUT STAGES to 2.
5. 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.
6. Apply 2A to terminals A1-A2 (phase A).
7. Energize digital input CC1 PHASE A BF INITIATE (terminal C9-D10).
8. Check that after T1 time delay (1s), the following contacts are closed:
A12-B12
C4-D4
C5-D5
In case the relay under test includes an expansion board, check also the operation of the following contacts:
E1-F1
E2-F2
E3-F3
9. Check that after 2nd Stage Timer delay (2s), the following contacts are closed:
C1-D1
C6-D6
C7-D7
and if the relay is equipped with an expansion board also the following contacts must be closed:
E4-F4
E5-F5
E6-F6
10. Repeat steps 7, 8, 9 and 10 using phase B current (B1-B2 terminals) and CC2 PHASE B BF INITIATE (D9-
D10 terminals) to start the breaker failure operation.
11. Repeat steps 7, 8, 9 and 10 using phase C current (A3-A4 terminals) and CC3 PHASE C BF INITIATE (C10-
D10 terminals) to start the breaker failure operation.
12. Change setpoint TABLE 1/50BF SETTINGS/Nº OUTPUT STAGES to 1.
13. Repeat steps 7 to 12 to check that in this case contacts C1-D1, C6-D6, C7-D7, E4-F4, E5-F5 and E6-F6 close
at the same time than contacts: A12-B12, C4-D4, C5-D5 and E1-F1, E2-F2, E3-F3 (if an expansion board is
available).