Hitachi Relion 670 Series Commissioning Manual page 220

Section 11
Testing functionality by secondary injection
11.10.2.4 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 RI 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
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 RI signal.
4. Check that no auto reclosing takes place.
Checking the influence of circuit breaker not ready for reclosing
1. Check that the auto recloser function is operative, for example by making an auto reclosing shot.
Keep the CB simulator BR closed. Remove the CBREADY signal by opening SRY.
2. Apply a fault and thereby a RI signal.
3. Check that no auto reclosing takes place.
Checking the influence of synchrocheck (at three-pole reclosing)
1. Check that the auto recloser is operative, for example, by making a three-pole reclosing shot with
the synchrocheck SESRSYN (25)conditions fullfilled.
Set the SESRSYN (25) function to Disabled to eliminate the signal connected to input signal SYNC.
2. Apply a fault causing three-phase trip and thereby a RI and a TR3P signal to the auto recloser.
3. Wait for the tSync time-out limit.
Check that no reclosing is made.
Checking the response when auto recloser is Off
Procedure
1. Check that the auto recloser is operative, for example by making a reclosing shot.
Set the autoreclosing operation to Disabled, for example by external control.
The output READY shall be low, and PREP3P shall be high.
2. Apply a single phase fault and thereby a RI signal.
3. Check that a definitive three phase trip and no auto reclosing takes place.
Testing auto reclosing in a multi-breaker arrangement
The usual arrangement is to have an auto recloser per circuit-breaker. They can be in different circuit
breaker related IEDs or in a common IED.
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Line distance protection REL670
Commissioning manual