Protection Engineering Basics and Schemes Protection Engineering | Page 50

1.2.6.1 Phase Check Test

It is not the exact method to check the phase sequence but it is available method.

Circuit diagram

Method: � This can be done while system is alive, but take all PPEs before executing this test � Take one Phase Rotation meter, which must be correctly calibrated � Take one Proven Voltage transformer, whose phase sequence is A < 0 0, B < −120 0 and C < pg. 50