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The test voltage applied in the HV test of rotor winding of three-phase IM when it is subjected to be reversed or braked by reversing the primary supply while the motor is running is
1000 V + twice the rated voltage with a minimum of 1500 V
1000 V + twice the open circuit standstill voltage as measured between slip rings or secondary terminals
1000 V + four times the open circuit standstill secondary voltage
All of these