Hitachi Relion 670 Series Commissioning Manual page 168

Section 11
Testing functionality by secondary injection
11.5.8.5 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
1. Set RetripMode = Always.
2. Apply the fault condition, including initiation of CCRBRF (50BF), well above the set current value.
3. Verify that re-trip is achieved after the set time t1, and the 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 re-trip is achieved after set time t1, but no back-up trip is obtained.
6. Disconnect AC and BFI_3P input signals.
11.5.8.6 Verifying the back-up trip mode
In the cases below it is assumed that FunctionMode = Current is selected.
Checking that back-up tripping is not achieved at normal CB tripping
Use the actual tripping modes. The case below applies to re-trip with current check.
1. Apply the fault condition, including initiation of CCRBRF (50BF), with phase current well above set
value Pickup_PH.
2. Interrupt the current, with a margin before back-up trip time, t2. It may be made at issue of re-trip
command.
3. Check that re-trip is achieved, if selected, but no back-up trip is obtained.
4. Disconnect AC and BFI_3P input signals.
The normal mode BuTripMode = 1 out of 3 should have been verified in the tests above. In applicable
cases the modes 1 out of 4 and 2 out of 4 can be checked. Choose the mode below, which corresponds
to the actual case.
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Commissioning manual