P54x/EN CM/La4 Commissioning
(CM) 10-50
MiCOM P543, P544, P545 & P546
CM
The fault current on the A-phase should be set to 3 times the [3316: I Rev] setting, and in
antiphase to the forward injections, i.e:
Ia = 3 x I Rev 180˚ - Line
Phases B and C should retain their healthy prefault voltage, and no current. The duration of
injection should be set to 100 ms.
Prepare the dynamic A phase reverse fault, as detailed above. Ensure that the test set is
simulating Steps 1 and 2 as one continuous transition. Connect a timer to start when the
fault injection (Step 2) is applied, and to stop when the Delta scheme Signal Send contact
closes. Apply the test, and record the signal send contact response time. Switch OFF the
ac supply and reset the alarms.
The recorded operating time should typically be less than 20 ms for 50 Hz, and less than
16.7 ms for 60 Hz applications.
Upon completion of the tests any current differential, distance, DEF, overcurrent,
earth fault, breaker fail or supervision elements which were disabled for testing
purposes must have their original settings restored in the CONFIGURATION column.
Ensure that any wires/leads temporarily fitted to energize the channel receive opto
input have been removed.
8.4.9 Out of step protection (if enabled)
If the out of s
tep tripping protection function is being used, it should be tested. If not, skip to
section 8.4.10
Out of step tripping p
rotection applies only to P54x relays with hardware version J or later,
and with software version 33 or later.
This test is suitable for injection sets with a state sequencer function as dynamic impedance
conditions are going to be tested. Up to four states impedances that will be applied during
the Out of Step commissioning are presented in Figure 6.
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