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Section 11
Testing functionality by secondary injection
An adequate time interval between the faults should be considered, to overcome a reclaim time
caused by the possible activation of the autorecloser function SMBRREC. The function must
issue a three-phase trip in all cases when trip is initiated by any protection or some other built-
in or external function. The following functional output signals must always appear
simultaneously: TRIP, TRL1, TRL2, TRL3 and TR3P.
11.12.1.3
1ph/3ph operating mode
In addition to various other tests, the following tests should be performed. They depend on the
complete configuration of an IED:
Procedure
1.
Make sure that TripLockout and AutoLock are both set to Off.
2.
Initiate different single-phase-to-earth faults one at a time.
Single-phase tripping will only be allowed when an autoreclose attempt will follow. The
autorecloser function SMBRREC has the functionality such as the long trip time, CB ready and
so on, which can prevent a proper single-phase tripping and autoreclose. To by-pass this
problem the fault initiation should be with a test set and with the autoreclose in full service with
a test set connected to the distance protection function. Consider using an adequate time
interval between faults, to overcome a reclaim time of which is activated by SMBRREC. Only a
single-phase trip should occur for each separate fault and only one of the trip outputs (TRLn)
should be activated at a time. Functional outputs TRIP and TR1P should be active during each
fault. No other outputs should be active.
3.
Initiate different phase-to-phase and three-phase faults.
Consider using an adequate time interval between faults, to overcome a reclaim time, which is
activated by SMBRREC. A three-phase trip should occur for each separate fault and all of the
trips. Functional outputs TRIP, all TRLn and TR3P should be active at each fault.
4.
Initiate a single phase-to-earth fault and switch it off immediately when the trip signal is issued
for the corresponding phase. Initiate the same fault once again within the reclaim time of the
used SMBRREC.
A single-phase fault shall be given at the first fault. A three-phase trip must be initiated for the
second fault. Check that the corresponding trip signals appear after both faults. Functional
outputs TRIP, TRLn and TR1P should be active during first fault. No other outputs should be
active. Functional outputs TRIP, all TRLn and TR3P should be active during second fault.
5.
Initiate a single phase-to-earth fault and switch it off immediately when the trip signal is issued
for the corresponding phase. Initiate the second single phase-to-earth fault in one of the
remaining phases within the time interval, shorter than tEvolvingFault (default setting 2.0s) and
shorter than the dead-time of SMBRREC, when included in the protection scheme.
Check that the second trip is a three-phase trip and that a three-phase autoreclosing attempt is
given after the three-phase dead time. Functional outputs TRIP, TRLn and TR1P should be
active during the first fault. No other outputs should be active. Functional outputs TRIP, all
TRLn and TR3P should be active during second fault.
11.12.1.4
1ph/2ph/3ph operating mode
In addition to other tests, the following tests, which depend on the complete configuration of an IED,
should be carried out.
Procedure
1.
Make sure that AutoLock and TripLockout are both set to Off.
2.
Initiate different single-phase-to-earth faults one at a time.
234
No other outputs should be active.
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1MRK 505 378-UEN Rev. K
SEMOD54375-116 v5
SEMOD54375-143 v6
Line differential protection RED670
Commissioning manual
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