why overload relay is not tripped at time of starting of motor allthough

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Question

why overload relay is not tripped at time of starting of 
motor allthough staring current is too high?

Question Submitted By :: Surajkant

I also faced this Question!!

Rank

Answer Posted By

Re: why overload relay is not tripped at time of starting of motor allthough staring current is too high?

Answer
# 1

when motor starts high Inrush current flows,
Relays are made smarter/biased to sense this Inrush current
and wait to let this current vanished. Inrush current has 2nd harmonics components and this makes it easy to recognize this current from normal current.

Is This Answer Correct ?

1 Yes

0 No

Ikab

Re: why overload relay is not tripped at time of starting of motor allthough staring current is too high?

Answer
# 2

As simple one, we are using the starters ( DOL, Star Delta) 
liket that for this purpose.

So this starter will help to start the motor with reduced 
starting current.

Is This Answer Correct ?

0 Yes

2 No

Lokesh

Question	Asked @	Answers
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