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Section 10
Testing functionality by secondary injection
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
5.
Verify that back-up trip is not achieved.
6.
Disconnect AC and START input signals.
10.4.6.7
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.
10.4.6.8
Verifying the case FunctionMode = CB Pos
It is assumed that re-trip without current check is selected, RetripMode = UseFunctionMode.
1.
Set FunctionMode = CB Pos.
2.
Apply input signal for CB closed to relevant input or inputs CBCLDL1, CBCLD2 or CBCDL3.
3.
Apply the input signal, or signals for the start of CCRBRF.
4.
Verify that phase selection re-trip and backup trip are achieved after set times.
5.
Disconnect the start signal(s). Keep the CB closed signal(s).
6.
Apply input signal(s), for start of CCRBRF.
7.
Arrange disconnection of CB closed signal(s) well before set backup trip time t2
8.
Verify that backup trip is not achieved.
10.4.6.9
Verifying the case RetripMode = Contact
It is assumed that re-trip without current check is selected, RetripMode = Contact.
1.
Set FunctionMode = Contact
2.
Apply input signal for CB closed to relevant input or inputs CBCLDL1, CBCLD2 or CBCDL3.
3.
Apply the input signal, or signals for the start of CCRBRF.
4.
Verify that phase selection re-trip and back-up trip are achieved after set times.
5.
Disconnect the start signal(s). Keep the CB closed signal(s).
86
) will be above set value IN>.
0
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1MRK 505 372-UEN Rev. K
M12104-179 v7
M12104-197 v7
GUID-06D1545D-31F7-4B48-821E-151212962A81 v1
M12104-213 v10
Busbar protection REB670
Commissioning manual
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