ABB REG670 2.0 IEC - Checking the Residual (Earth Fault) Current Operate Value IN> Set below IP; Checking the Re-Trip and Back-Up Times; Verifying the Re-Trip Mode

Note! If No CBPos Check or Retrip off is set, only back-up trip
can be used to check set IP>.
12.5.8.2 Checking the residual (earth fault) current operate value IN> set below
IP>
Check the low set IN> current where setting FunctionMode = Current and setting
BuTripMode = 1 out of 4
1. Apply the fault condition, including START of CCRBRF, with a current just
below set IN>.
2. Repeat the fault condition and increase the current in steps until trip appears.
3. Compare the result with the set IN>.
4. Disconnect AC and START input signals.
12.5.8.3 Checking the re-trip and back-up times
The check of the set times can be made in connection with the check of operate values
above.
Choose the applicable function and trip mode, such as FunctionMode = Current and
RetripMode = CB Pos Check .
1. Apply the fault condition, including start of CCRBRF, well above the set current
value. Measure time from START of CCRBRF.
2. Check the re-trip t1 and back-up trip times t2 and t3.
In applicable cases, the back-up trip for multi-phase start t2MPh and back-up trip
2, t2 and t3 can also be checked. To check t2MPh, a two-phase or three-phase
start shall be applied.
3. Disconnect AC and START input signals.
12.5.8.4 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 = Retrip Off
1. Set RetripMode = Retrip Off.
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, RetripMode = CB Pos Check
1MRK502053-UEN B Section 12
Testing functionality by secondary injection
Generator protection REG670 2.0 IEC 161
Commissioning manual