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.
9.8.2.4 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
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
M12400-137 v5
1. Check that the auto recloser is operative, for example by making a reclosing
shot.
Keep the CBREADY signal high.
2. Set the breaker simulating relay BR in Open position.
3. Close the BR relay and immediately apply a fault and thereby a START
signal.
4. Check that no auto reclosing takes place.
Checking the influence of circuit breaker not ready for reclosing
M12400-149 v5
1MRK 506 383-UEN A Section 9
Testing functionality by secondary injection
Line distance protection REL650 2.2 IEC 145
Commissioning manual
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