Power frequency test voltages for AC motor windings

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3.1. Power frequency test voltages for AC motor windings. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

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Table 29

Test item	Electric motor power, kW	Rated motor voltage, kV	Test voltage, kV
Stator winding	40 and more, as well as electric motors of responsible mechanisms * Less than 40	0,4 and below 0,5 0,66 2,0 3,0 6,0 10,0 0,66 and below	1,0 1,5 1,7 4,0 5,0 10,0 16,0 1,0
Rotor winding of synchronous electric motors intended for direct starting, with excitation winding closed to a resistor or power supply	-	-	1,0
Winding of the rotor of an electric motor with a phase rotor	-	-	1,5 U_р**, but not less than 1,0
Field damping resistor for synchronous motors	-	-	2,0
Rheostats and ballast resistors	-	-	1,5 U_р, but not less than 1,0

* The test must be carried out immediately after stopping the motor before cleaning it from contamination.
* Ur - voltage on the rings with an open stationary rotor and rated voltage on the stator.

See other articles Section Rules for the technical operation of consumer electrical installations (PTE).

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