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1MRK502053-UEN B
12.5.8.6
12.5.8.7
Generator protection REG670 2.0 IEC
Commissioning manual
Testing functionality by secondary injection
BuTripMode = 2 out of 4
Checking the case
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
) will be above set value IN>.
0
5.
Verify that back-up trip is not achieved.
6.
Disconnect AC and START input signals.
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.
RetripMode = Contact
Verifying the case
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).
6.
Apply input signal(s), for start of CCRBRF.
7.
8.
Arrange disconnection of CB closed signal(s) well before set back-up trip time
t2.
9.
Verify that back-up trip is not achieved.
Section 12
163
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Troubleshooting
