ABB Relion 650 Series Commissioning Manual page 58

Section 5
Testing functionality
50
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.
Procedure:
1. Apply the fault condition, including start of CCRBRF, with phase current
well above set value "IP"
2. Arrange switching the current off, 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.
4. Disconnect AC and start 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.
BuTripMode = 1 out of 4
Checking the case
It is assumed that EF current setting IN> is below phase current setting IP>.
Procedure:
1. Set BuTripMode = 1 out of 4.
2. Apply the fault condition, including start of CCRBRF, with one phase current
below set IP> but above IN>. The residual (EF) 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.
BuTripMode = 2 out of 4
Checking the case
The EF current setting IN> may be equal to or below phase current setting IP>.
Procedure:
1. Set BuTripMode = 2 out of 4
2. Apply the fault condition, including start of CCRBRF, with one phase current
above set IP> and residual (EF) above set IN It can be obtained by applying a
single phase current.
3. Verify that back-up trip is achieved after set time. If selected, re-trip should
also appear.
4. Apply the fault condition, including start of CCRBRF, with at least one phase
current below set IP> and residual (EF) above set IN>. The current may be
arranged by feeding three (or two) phase currents with equal phase angle (I0-
component) below IP>, but of such value that the residual (EF) current (3I
will be above set value IN>.
5. Verify that back-up trip is not achieved.
6. Disconnect AC and start input signals.
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REC650
Commissioning Manual