ABB Relion 670 Series Commissioning Manual page 90

Section 10
Testing functionality by secondary injection
10.4.6.3 Checking the residual (ground fault) current trip value Pickup_N set below
Pickup_PH
Check the low set Pickup_N current where setting FunctionMode = Current and setting BuTripMode = 1
out of 4
1. Apply the fault condition, including BFI_3P of CCRBRF (50BF), with a current just below set
Pickup_N.
2. Repeat the fault condition and increase the current in steps until trip appears. Note that the
INITIATE signal shall be re-applied for each new current value.
3. Compare the result with the set Pickup_N.
4. Disconnect AC and BFI_3P input signals.
10.4.6.4 Checking the re-trip and back-up times
The check of the set times can be made in connection with the check of trip values above.
Choose the applicable function and trip mode, such as FunctionMode = Current and RetripMode =
UseFunctionMode.
1. Apply the fault condition, including initiation of CCRBRF (50BF), well above the set current value.
Measure time from BFI_3P of CCRBRF (50BF).
2. Check the re-trip t1 and back-up trip times t2 and t3.
In applicable cases, the back-up trip for multi-phase pickupt2MPh and back-up trip 2, t2 and t3 can
also be checked. To check t2MPh, a two-phase or three-phase initiation shall be applied.
3. Disconnect AC and BFI_3P input signals.
10.4.6.5 Verifying the re-trip mode
Choose the mode below, which corresponds to the actual case.
In the cases below it is assumed that FunctionMode = Current is selected.
Checking the case without re-trip, RetripMode = Off
1. Set RetripMode = Off.
2. Apply the fault condition, including initiation of CCRBRF (50BF), well above the set current value.
3. Verify that no re-trip, but back-up trip is achieved after set time.
4. Disconnect AC and BFI_3P input signals.
Checking the re-trip with current check, RetripMode = UseFunctionMode
1. Set RetripMode = UseFunctionMode.
2. Apply the fault condition, including initiation of CCRBRF (50BF), well above the set current value.
3. Verify that re-trip is achieved after set time t1 and back-up trip after time t2.
4. Apply the fault condition, including initiation of CCRBRF (50BF), with current below set current
value.
5. Verify that no re-trip, and no back-up trip is obtained.
6. Disconnect AC and BFI_3P input signals.
Checking re-trip without current check
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Busbar protection REB670
Commissioning manual