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1MRK 504 165-UEN Rev. K
11.11.2.3
Verifying the auto recloser
Select the test cases to be run according to what is applicable to the particular application. It can be,
for example,
•
three-phase single-shot auto reclosing
•
two-shot reclosing
•
single-phase and three-phase single-shot auto reclosing
Below, a case with single-phase and three-phase single-shot auto reclosing is described.
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.
11.11.2.4
Checking the auto reclosing conditions
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
1.
Check that the auto recloser is operative, for example, by making a reclosing shot without the
INHIBIT signal.
2.
Apply a fault and thereby a START signal. At the same time, or during the dead time, apply a
signal to the input INHIBIT.
3.
Check that the auto reclosing sequence is interrupted and no auto reclosing takes place.
Check closing onto a fault
Transformer protection RET670
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
Section 11
Testing functionality by secondary injection
M12400-91 v12
M12400-123 v5
M12400-129 v5
M12400-137 v5
239
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