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Discuss What should be the minimum resistance required between 3 phase and grounding (connecting wire to earth) in the Electrical Forum area at ElectriciansForums.net

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Hi
I am new to electrical engineering. I want to measure the 3 phase voltage near the water pumpset motors.

I have connected phase lines to earth through a diode and six 1 mega ohm resistors (measuring the voltage across resistor). The same earthing wire is connected to ground in my dc circuit.

Now my motor is damaged and the winding is burned.

I am not sure what is the reason? Will this circuit causes damage to the motor windings? Please suggest.

What is the minimum resistance required between 440v to earthing during motor on ( carying current of 20 amps).

P.s: I have taken earthing as i dont have neutral point

Thanks
Manjunath
 
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