ABB Relion 670 Series Commissioning Manual page 177

1MRK 506 371-UUS E
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
2. Interrupt the current, with a margin before back-up trip time,
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
applicable cases the modes
which corresponds to the actual case.
Checking the case
It is assumed that the ground-fault current setting
Pickup_PH .
1. Set
2. Apply the fault condition, including initiation of CCRBRF (50BF), with one-phase current
below set
set
3. Verify that back-up trip is achieved after set time. If selected, re-trip should also appear.
4. Disconnect AC and BFI_3P input signals.
Checking the case
The ground-fault current setting
Pickup_PH .
1. Set
2. Apply the fault condition, including initiation of CCRBRF (50BF), with one-phase current
above set
3. Verify that back-up trip is achieved after set time. If selected, re-trip should also appear.
4. Apply the fault condition, including initiation of CCRBRF (50BF), with at least one-phase
current below set
be arranged by feeding three- (or two-) phase currents with equal phase angle (I0-
component) below
will be above set value
5. Verify that back-up trip is not achieved.
6. Disconnect AC and BFI_3P input signals.
11.5.8.6 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.
Line distance protection REL670
Commissioning manual
Pickup_PH .
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 .
Pickup_PH but above Pickup_N . The residual ground-fault should then be above
Pickup_N .
BuTripMode = 2 out of 4
BuTripMode = 2 out of 4 .
Pickup_PH and residual (ground fault) above set Pickup_N .
Pickup_PH and residual (ground fault) above set Pickup_N . The current may
Pickup_PH , but of such value that the residual (ground fault) current (3I
Pickup_N .
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Pickup_N is below phase current setting
Pickup_N may be equal to or below phase-current setting
Testing functionality by secondary injection
t2 . It may be made at issue of
Section 11
M12104-150 v8
M12104-165 v6
M12104-179 v7
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0
M12104-197 v7
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