How to test 3-phase motor using MEGGER meter ? Winding resistance and insulation test.

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[chnbrs]

So should we connect the plus end of the megger to the body or to the winding? so how should the correct polarity be?

[yubachuck]

Firstly: What is the allowable value of the insulation resistance? Secondly: You must reverse the connections of your device, the positive terminal will be connected on the winding and the negative terminal on the the motor housing. Good luck!

[Joe.]

What about spinning the motor to look for shorts? Video is good but I had a motor that blew a 200 amp breaker. We megged it and it looked good until we spun the shaft. That’s when the short appeared.

[rajinmithra]

How to test the winding insulation of a submersible motor using a megger meter(Rish insu 20 insulation resistance tester)

[IK-quhw]

Sir motor windings are connected in star or delta ? Bcoz there's no strip.

[falgunpatel]

Apart from this tests which one is insulation resistance (IR) test?

[garbo]

Taking too much time. Out in the real world the production boss demands quick but accurate troubleshooting. I was an industrial electrician for 50 great years and NEVER removed jumpers on an POS IEC motor or wasted time measuring resistance from IEC motor coil to another. If a winding is shorted or grounded does not matter because motor must be replaced ASAP. Ran several 480 motors with 5 meggerohms from motor coil to ground. You placed one merger lead on a painted surface . A big no no . Must be clipped to ground screw or bare clean metal. Should tell people that merger voltage is supposed to be double the line voltage plus a hundred volts so you need a 1, 000 volt merger to properly measure a 480 volt motor. I own a nice 5, 000 volt merger that found grounds in several 4, 160 volt motors over the years.

[Idrathernot.]

Where are the equivalents to 7, 8 & 9 leads?? What kind of sorcery is this?

[Joey-JoJo-Jr.]

I don’t see a MEGGER. I see a FLUKE tester.

[aldinandigodinez]

It is unnecessary to remove the star connection when doing insulation resistance test.

[papakutty]

Please explain with audio this is not useful.. can't understand for freshers