Answer / k.prakashchandra

Supposing that you have disconnected the neutral of GEN , you will measure the dc resistance of PT as the other end of it is earthed . 20 K ohm will be measured as 0 M ohm by the megger . If you want to test insulation of GEN , you have to isolate the winding from everything .

why we avoid parallel operation of diesl generator?

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length of 4 core cable 95mm from substation LV VFD panel to Motor at field approximately 150 meter. Motor stop and power has been isolated from LV MCC ( Substation )to disconnect Motor for services. After Motor completed service propose to reinstall and reconnect Motor Cable, found earth cable sparkling during touching at metal / motor body. Inspect by clamp meter found earth cable have current flow AC 1-2amps and all earth cable at MCC LV also have current flow as same value. why it is happen?

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