ABB Relion 670 Series Commissioning Manual page 92

Section 10
Testing functionality by secondary injection
10.4.6.7 Verifying instantaneous back-up trip at CB faulty condition
Applies in a case where a signal from CB supervision function regarding CB being faulty and unable to
trip is connected to input 52FAIL.
1. Repeat the check of back-up trip time. Disconnect current and input signals.
2. Activate the input 52FAIL. The output CBALARM (CB faulty alarm) should appear after set time
tCBAlarm. Keep the input activated.
3. Apply the fault condition, including initiation of CCRBRF (50BF), with current above set current
value.
4. Verify that back-up trip is obtained without intentional delay, for example within 20ms from
application of initiation.
5. Disconnect injected AC and BFI_3P input signals.
10.4.6.8 Verifying the case FunctionMode = CB Pos
It is assumed that re-trip without current check is selected, RetripMode = UseFunctionMode.
1. Set FunctionMode = CB Pos.
2. Apply input signal for CB closed to relevant input or inputs 52A_A, 52A_B or 52A_C.
3. Apply the input signal, or signals for the start of CCRBRF.
4. Verify that phase selection re-trip and backup trip are achieved after set times.
5. Disconnect the start signal(s). Keep the CB closed signal(s).
6. Apply input signal(s), for start of CCRBRF.
7. Arrange disconnection of CB closed signal(s) well before set backup trip time t2
8. Verify that backup trip is not achieved.
10.4.6.9 Verifying the case RetripMode = Contact
It is assumed that re-trip without current check is selected, RetripMode = Contact.
1. Set FunctionMode = Contact
2. Apply input signal for CB closed to relevant input or inputs 52a_A (B or C).
3. Apply input signal, or signals for initiation of CCRBRF (50BF).
4. Verify that phase selection re-trip and back-up trip are achieved after set times.
5. Disconnect the trip signal(s). Keep the CB closed signal(s).
6. Apply input signal(s), for initiation of CCRBRF (50BF).
7. Arrange disconnection of CB closed signal(s) well before set back-up trip time t2.
8. Verify that back-up trip is not achieved.
9. Disconnect injected AC and BFI_3P input signals.
10.4.6.10 Verifying the caseFunctionMode = Current or CB Pos
To be made only whenFunctionMode = Current or CB Pos is selected. It is suggested to make the tests
in one phase only, or at three-pole trip applications for just three-pole tripping.
Checking the case with fault current above set value Pickup_PH
The operation shall be as in RetripMode = UseFunctionMode.
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Commissioning manual