Answer / arockia doss

Reasons Behind :

1. Loose Connection
2. Three phase cut into two phase
3. Winding Failure
4. Mechanical Damage/Overlaod
5. Higher Voltage/Frequency

If its so ,Breaker should get trip. If not it will damage
the motor.

Answer / pillay

that means the motor is finding it harder to maintain
the speed. it could be due to so many reasons as already said
by DASS and VENKAT.
What happens is if any of the motor protective devices dont
trigger the motor to stop than it will continue to run
until the windings give way due to overheat and finally insulation breakdown which is commonly known as burnt.

Answer / venkatesh sk

moto should be terminal loose& connetion&load more &
frquency very&motor capacity low& voltage low

Answer / gagan kumptar gua

when a motor take high current the wiring of the winding
will be burnt becouse H is proposnal to square of
current.it happens due to loose connection or over load and
change in frequency of voltage.

Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on External earth fault REF relay trips along with earth fault relay.The REF relay has no complant as we tested relay.Why is it happening?

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