Phase B
1. Reconfigure the test equipment to inject fault current into the B phase.
2. Repeat the test, this time ensuring that the breaker trip contacts relative to B phase operation close
correctly.
3. Record the B phase trip time.
4. Switch OFF the ac supply and reset the alarms
Phase C
1. Repeat the above procedure for the C phase.
2. Switch OFF the ac supply and reset the alarms.
The average of the recorded operating times for the three phases should be less than 40 ms for 50 Hz, and less
than 35 ms for 60 Hz when set for instantaneous operation.
Note:
For applications using magnetising inrush current restraint, use a test current higher than the Inrush High setting to obtain
fast operating times. A setting of at least twice the Inrush High setting is recommended.
The expected operating time is typically within +/- 5% (for IDMT) or +/-2% (for DT) of that for the curve equation
plus the “instantaneous” delay quoted above.
When the tests are completed, restore the original settings of any elements which were disabled for testing
purposes. Use the CONFIGURATION column.
Chapter 25 - Commissioning Instructions P543i/P545i
666 P54x1i-TM-EN-1
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