Explain how you can give the overload setting to any Motor
Protection
Relay for a HT motors with formula and example?
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Answer Posted / prabhas
Motor current rating is calculated by using the formula
I= P/1.73*V*PF
Normany it is 1.8times of power of the motor will be their
in 420v 3 phase motor.
Ex: 500Kv HT motor 11kv voltage
is Approx. 32A is the rated current.
so 32.5 or 33A is OL Setting.
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