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When measuring the Insulation resistance of a motor winding
(winding to earth) using a megger meter, Applied
voltage(1000V) was automatically reduced to 500V. and the
measured insulation resistance values are also very low (in
Kohm range) Can anyone give me a reason???
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Answer Posted / sridhar
there are two reasons of getting the value low.
1. due to moisture in the motor
2. winding has become weak
to overcome these problems the methods can be adopted
1. heater or halogen lamp to be provided near to the
winding of the motor to bring the resistance value as per
std.
2. by this above method, the insulation resistance is not
upto the mark, the same winding can be overhauled to
achieve the required insulation resistance value.
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