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 reclosing
program is selected, there shall be one reclosing operation and then blocking of
SMBRREC for the set Reclaim time.
Before a new reclosing sequence can be run, the CBREADY and CBPOS (CB
closed) 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,
FirstShot
=
1ph
, a check can be run to
make sure that a three-phase trip does not result in any reclosing. Other similar
cases can be checked as required.
10.10.2.4
Checking the reclosing conditions
When checking the influence of a releasing condition it is suggested to first run a
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 autorecloser function SMBRREC 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 open
time, apply a signal to the input INHIBIT.
3.
Check that the reclosing sequence is interrupted and no reclosing takes place.
Check closing onto a fault
1.
Check that the autorecloser function SMBRREC 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 apply immediately a fault and thereby a START signal.
4.
Check that no reclosing takes place.
Checking the influence of CB not ready for reclosing
1.
Check that the autorecloser function SMBRREC is operative, for example by
making a reclosing shot.
1MRK 506 355-UEN A
Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC
207
Commissioning manual
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