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4.
Apply the fault condition, including initiation of CCRBRF (50BF), with current
below set current value.
5.
Verify that re-trip is achieved after set time
t1
, but no back-up trip is obtained.
6.
Disconnect AC and INITIATE input signals.
6.3.9.5
Verifying the back-up trip mode
In the cases below it is assumed that
FunctionMode
=
Current
is selected.
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
IP
.
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 INITIATE 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.
Checking the case
BuTripMode = 1 out of 4
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 INITIATE input signals.
Checking the case
BuTripMode = 2 out of 4
The ground-fault current setting
Pickup_N
may be equal to or below phase-current setting
Pickup_PH
.
Section 6
1MRK 505 293-UUS A
Testing functionality
62
Commissioning manual