1. Set Operation = On.
2. If the synchrocheck SESRSYN is not to be operated, ensure that the signal
SYNC input is activated. If SESRSYN is to be included, ensure that it is
supplied with the appropriate AC quantities.
3.
Simulate CB closed position by closing switch SC to make the BR relay start.
4. Simulate CBREADY by closing the switch SRY, and leave it closed.
5. Inject AC quantities to give a trip, for example, a one-phase trip, to the BR
and to the START input of the auto recloser.
Observe and preferably record the operation. The BR relay shall trip and
reclose (start). After reclosing, the SRY switch can be opened for about 5s
and then closed again.
The auto reclosing open time and the sequence should be checked, for
example in the event recording. Check also the operation indications
(disturbance report) and the operation counters on the local HMI under Main
menu/Test/Function status/Control/AutoRecloser79,5(0–>1)/
SMBRREC(79,5(0–>)):x
Should the operation not be as expected, this should be investigated. It could
be caused by an inappropriate setting or missing condition such as
CBREADY.
6. Repeat the sequence by simulating a permanent fault.
Shortly after the reclosing shot, a new fault is applied. If a single-shot auto
reclosing program is selected, there shall be one reclosing operation and then
blocking of the auto recloser for the set reclaim time.
Before a new reclosing sequence can be run, the CBREADY and CBCLOSED
must be set manually.
7. Repeat the sequence by simulating a three-phase transient and permanent
faults, and other applicable cases, such as signal to STARTHS and high-speed
reclosing.
If just single-phase reclosing is selected, ARMode = 1ph, a check can be run
to make sure that a three-phase trip does not result in any auto reclosing.
Other similar cases can be checked as required.
11.10.2.4 Checking the auto reclosing conditions
M12400-123 v5
When checking the influence of a releasing condition it is suggested to first run an
auto reclosing sequence with the condition fulfilled. When the condition signal is
removed, and a new sequence is run, it indicates that the result was due to the
changed condition. In case of a blocking signal the procedure should be similar.
Start without the blocking or inhibit signal, and then run a sequence with the
blocking or inhibit signal added.
Checking the influence of the INHIBIT signal
M12400-129 v5
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 233
Commissioning manual
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