values should be within 1% of the expected values, plus an additional allowance for the accuracy of the test
equipment being used.
8.3 ON-LOAD BUSBAR DIFFERENTIAL TEST
This test ensures the busbar differential protection function has the correct load conditions. For this test you
must first know the actual direction of current flow in the complete system. If you do not already know this,
you must determine it using adjacent instrumentation or protection already in-service.
For a differential load current flowing in zone x, the Ix Z
x Diff cell in the MEASUREMENTS 2 column should
show a value near 0 (where x=zone 1 to 4).
If there is any uncertainty, check the phase angles of the phase currents and the status of all equipment in
the topology. Also confirm the correct terminal connections in their respective zones.
MiCOM P747 Chapter 14 - Commissioning Instructions
P747-TM-EN-1 363
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