Verifying The Back-Up Trip Mode - ABB RELION REG670 Commissioning Manual

Section 12
Testing functionality by secondary injection
1. Set
2. Apply the fault condition, including start of CCRBRF, well above the set current value.
3. Verify that no re-trip, but back-up trip is achieved after set time.
Checking the re-trip with current check,
1. Set
2. Apply the fault condition, including start of CCRBRF, well above the set current value.
3. Verify that re-trip is achieved after set time
4. Apply the fault condition, including the start of CCRBRF, with the current below the set
current value.
5. Verify that no re-trip, and no back-up trip is obtained.
Checking re-trip without current check
1. Set
2. Apply the fault condition, including start of CCRBRF, well above the set current value.
3. Verify that re-trip is achieved after the set time
4. Apply the fault condition, including start of CCRBRF, with current below set current value.
5. Verify that re-trip is achieved after set time
12.5.9.5

Verifying the back-up trip mode

In the cases below it is assumed that
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 start of CCRBRF, with phase current well above set
value
2. Interrupt the current, with a margin before back-up trip time,
of re-trip command.
3. Check that re-trip is achieved, if selected, but no back-up trip is obtained.
The normal mode
applicable cases the modes
which corresponds to the actual case.
Checking the case
It is assumed that the earth-fault current setting
1. Set
2. Apply the fault condition, including start of CCRBRF, with one-phase current below set
IP> but above IN> . The residual earth-fault should then be above set IN> .
3. Verify that back-up trip is achieved after set time. If selected, re-trip should also appear.
4. Disconnect AC and START input signals.
Checking the case
The earth-fault current setting
1. Set
2. Apply the fault condition, including start of CCRBRF, with one-phase current above set
IP> and residual (earth fault) above set IN> .
3. Verify that back-up trip is achieved after set time. If selected, re-trip should also appear.
166
RetripMode = Retrip Off .
RetripMode = CB Pos Check .
RetripMode = No CBPos Check .
IP> .
BuTripMode = 1 out of 3 should have been verified in the tests above. In
1 out of 4 and 2 out of 4 can be checked. Choose the mode below,
BuTripMode = 1 out of 4
BuTripMode = 1 out of 4 .
BuTripMode = 2 out of 4
IN> may be equal to or below phase-current setting IP> .
BuTripMode = 2 out of 4 .
RetripMode = CB Pos Check
t1 and back-up trip after time t2
t1 , and the back-up trip after time t2 .
t1 , but no back-up trip is obtained.
FunctionMode = Current is selected.
IN> is below phase current setting IP> .
1MRK 502 067-UEN B
M12104-48 v6
M12104-58 v8
M12104-146 v5
M12104-150 v7
t2 . It may be made at issue
M12104-165 v6
M12104-179 v7
Commissioning manual