Verifying The Back-Up Trip Mode; Verifying The Case Retripmode = Contact - ABB RET650 Series Commissioning Manual

Section 7
Testing functionality
7.4.6.5

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 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 INITIATE 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
Pickup_N .
3. Verify that back-up trip is achieved after set time. If selected, re-trip should also appear.
4. Disconnect AC and INITIATE 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 INITIATE input signals.
7.4.6.6 Verifying the case
It is assumed that re-trip without current check is selected,
1. Set
2. Apply input signal for CB closed to input 52a_A (B or C).
3. Apply input signal, for initiation of CCRBRF (50BF).
56
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 .
Pickup_PH but above Pickup_N . The residual ground-fault should then be above set
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 .
RetripMode = Contact
FunctionMode = Contact
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FunctionMode = Current is selected.
Pickup_N is below phase current setting
Pickup_N may be equal to or below phase-current setting
t2 . It may be made at issue of
RetripMode = Contact .
Transformer protection RET650
Commissioning manual
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