OP
Knobhead
Like RoB2 I use 500V followed by 1000V and have done so for the past 40 years. And to be honest with you I see no reason to change my methods.
Discuss 3 Phase Motor - Insulation Resistance Testing in the Commercial Electrical Advice area at ElectriciansForums.net
IF you are "looking" for a possible fault then a 1kV test could be justified.
However, it is not considered acceptable for routine maintenance checks as it CAN damage the equipment under test.
You asked why IR test the windings? Mainly as I have been told to, and a recent motor which failed was good to earth between phases, but when tested between 2 windings, it failed. Not the same terminals of the same windings by the way So should the windings to windings test be done with an ohm meter, and not a IR Tester?
The motors are IP56, but the cleaning people get very enthusiastic, and manage to get water in everywhere it seems!!
Oh I see. That is what I was testing for, insulation breakdown on the motor windings as the motor had failed.
At IP 56, the cleaners must be jet washing them individually. If that's the case, the company either needs to have words with these cleaners, or purchase very expensive IP 67 replacements!! lol!!
Reply to 3 Phase Motor - Insulation Resistance Testing in the Commercial Electrical Advice area at ElectriciansForums.net
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