Insulation Resistance Test
Insulation Resistance Test
(OP)
In the upcoming shutdown, we want to do the IR test and measure the winding resistance of generator winding. The generator is rated 11kV , 20.38 MW , 1337A, 0.8 pf. We dont have enough time in the shutdown open up things completed.
1. What can be the best way to measure winding resistance and IR test without opening the Terminal box?
2. What important test we must carry out (This is 12000hrs maintenance of the generator)
Thanks for your time and support
1. What can be the best way to measure winding resistance and IR test without opening the Terminal box?
2. What important test we must carry out (This is 12000hrs maintenance of the generator)
Thanks for your time and support






RE: Insulation Resistance Test
If it is only IR, generator neutral disconnecting switch point also can be considered.
For generator, I don't think you need to do much during 12,000hrs maintenance. winding resistance as measured at gcb terminals includes the connections and cable from generator to gcb and should provide you information in case there is loose connection anywhere and you can pickup the thread for doing some more checks. Same is with IR.
Hope the above helps.
RE: Insulation Resistance Test
The further you move away from the generator, then small changes in your machine may become hidden in the total resistance of the circuit.
RE: Insulation Resistance Test
RE: Insulation Resistance Test
It is better to start a new thread but the Megalert only tests the insulation when the unit is shut down, as I understand it. It is connected all the time but not continuously monitoring (impossible to do while energized).
RE: Insulation Resistance Test
You may also like to look at the US Bureau of Reclamation notes:
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