When using an insulation resistance meter or checking the star-connected windings, the test can be carried out as shown in figure (a); for delta-connected motors, the wiring of the three-phase windings must be disconnected and connected as shown in figure (b). Test method shown.
Figure uses an insulation resistance meter or multimeter to detect motor stator winding open circuit faults
(a) Star-connected motor; (b) Delta-connected motor
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