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 (or
SYNC at three-phase reclosing).
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 the
auto-reclosing function for the set Reset time.
Before a new reclosing sequence can be run, the CBREADY and 52A (CB closed)
must be set manually.
6.7.3.4 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.
6.7.3.5 Checking the influence of the INHIBIT signal
1. Check that the auto-reclosing function is operative, for example, by making a
reclosing shot without the INHIBIT signal.
2. Apply a fault and thereby a PICKUP 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.
6.7.3.6 Check closing onto a fault
1. Check that the closing function 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 an INITIATE signal.
4. Check that no reclosing takes place.
6.7.3.7 Checking the influence of CB not ready for reclosing
1. Check that the auto-reclosing function is operative, for example by making a
reclosing shot.
Section 6 1MRK 505 293-UUS A
Testing functionality
110
Commissioning manual
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