Date Code 20010719 701 Motor Protection Relay
Commissioning
Relay Commissioning Procedure
7.7
Step 17. If your relay is equipped with voltage inputs, check the following:
Phase voltage magnitudes should be nearly equal.
Phase voltage phase angles should be balanced and have proper
phase rotation.
The negative-sequence voltage magnitude, V2, and zero-
sequence voltage magnitude, 3V0, if shown, should both be
nearly zero.
NOTE: If the relay reports V1 near zero and V2 nearly equal to
VAB/1.74, there is a phase rotation problem. Verify the relay ac
voltage connections and the phase rotation setting, PHROT. A
nonzero 3V0 meter value, if shown, typically indicates a single-
phase voltage connection problem.
Step 18. The SEL-701 Relay is now ready for continuous service.
To Next Page
Loading...
