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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 earth-fault current setting
IN>
is below phase current setting
IP>
.
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 earth-fault 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.
Checking the case
BuTripMode = 2 out of 4
The earth-fault current setting
IN>
may be equal to or below phase-current setting
IP>
.
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 (earth fault) above set
IN>
.
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 (earth fault) 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 (earth fault)
current (3I
0
) will be above set value
IN>
.
5.
Verify that back-up trip is not achieved.
6.
Disconnect AC and START input signals.
10.4.6.6
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 CBFLT.
1.
Repeat the check of back-up trip time. Disconnect current and START input
signals.
2.
Activate the input CBFLT. The output CBALARM (CB faulty alarm) should
appear after set time
tCBAlarm
. Keep the input activated.
3.
Apply the fault condition, including start of CCRBRF, with current above set
current value.
4.
Verify that back-up trip is obtained without intentional delay, for example
within 20ms from application of start.
1MRK 504 160-UEN -
Section 10
Testing functionality by secondary injection
Transformer protection RET650 2.1 IEC
79
Commissioning manual
Содержание RET650 2.1 IEC
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