ABB REG670 Commissioning Manual page 210

Section 13
Testing functionality by secondary injection
204
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.
BuTripMode = 1 out of 4
Checking the case
It is assumed that the ground-fault current setting Pickup_N is below phase current
setting Pickup_PH.
1. Set BuTripMode = 1 out of 4.
2. Apply the fault condition, including initiation of CCRBRF (50BF), with one-
phase current below set Pickup_PH but above Pickup_N . The residual ground-
fault should then be above set Pickup_N.
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.
BuTripMode = 2 out of 4
Checking the case
The ground-fault current setting Pickup_N may be equal to or below phase-current
setting Pickup_PH.
1. Set BuTripMode = 2 out of 4.
2. Apply the fault condition, including initiation of CCRBRF (50BF), with one-
phase current above set Pickup_PH and residual (ground fault) above set
Pickup_N.
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 Pickup_PH and residual (ground fault) above set
Pickup_N. The current may be arranged by feeding three- (or two-) phase
currents with equal phase angle (I0-component) below Pickup_PH, but of such
value that the residual (ground fault) current (3I
Pickup_N.
5. Verify that back-up trip is not achieved.
6. Disconnect AC and BFI_3P input signals.
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
1MRK 502 073-UUS A
) will be above set value
0
Commissioning manual
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