how to test insulation resistance winding

We have a 180 ton Bitzer compressor that has come to the workshop
Mehr Espand engineering group was brought for repair
Declaring that the winding is burnt
Let's check one of the terminals
Electric arc
To test the megger, we set it to 500 volts
Maximum time allowed for testing
It is 5 seconds
But do this for one or two more seconds
Do not see because it is considered a destructive test
One end is connected to the base of the terminal and the other end to the body
2000 megaohm
All bases 2000
2000 Now if we put two heads together somewhere
OK, if you see a burnt wire, it is zero ohm
We
consider 2000 megaohm as the infinite
The next problem
is in the suction filter.
Here we have copper shavings.
We have to do the after-valfing
on the evaporator when Deller
Iron shavings and shavings
Copper has come to the side of the compressor
Second, we check this compressor
We did it and we did it
Apparently my winding is ok
Mechanically, it is OK and the compressor is new
Such a problem occurred during startup
And we came to the conclusion that the winding is healthy
We want to start it and after
Starting and replacing the compressor power terminal is ready to be sent

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NICE