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

Answer Posted / r.c.tiwari

becouse at the time of starting motor take high current
very less duration & over load relay generaly made by
bymatelic contect elements.by matelic element take a time
for heating.so over load rely not trip at the time of
starting.

Is This Answer Correct ?    21 Yes 2 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

What is the difference between the relay and the circuit breaker?

607


I HAVE BEEN SELECTED FOR APGENCO A.E(ELECTRICAL) 2008.HOW MUCH WEIGHTAGE FOR INTERVIEW AND WRITTEN TEST.HOW I HAVE TO PREPARE. PLEASE GIVE INFORMATION IF U KNOW.WHAT ABT G.D THIS TIME.CALL RATIO 1:2

2419


Give the expression for the frequency of oscillations in an op-amp sine wave oscillator?

643


we have a 2.5hp Starite electric motor water pump,the elec motor burned out,we need to replace starting capacitor(old capacitor specs erased),what microfarad rating capacitor do we need? 110-125V

1351


Is it possible to measure the voltage of a battery from a single terminal?

1230






A 400 V, 50 Hz, Δ connected synchronous generator has a field reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 1200 A at 0.8 pf lagging. Under full-load conditions, the friction and windage losses are 40 KW and the core losses are 30 KW. What is the machine’s overall efficiency? Ignore any field circuit losses.

1335


what are the major & minor faults that occur in an inverter and in UPS ? And how to repair and resolve them ?

1828


specify the inbuilt protections in DG

1616


ROC converges if pole and zero lies inside a) origin b) z=1 c) pole d) zero ? Explanation please? if ROC does not converges then?

2457


In PFI plant one stage capacitor connection is directly connected(with out megnetic contact controll). but why?

1877


why using transformer and thyristor switch in 3 phase apfc panel

2373


Whether the vacuum contactor requires Short circuit protection?If No,why?

1579


What are the uses of lead compensator?

599


Hello Guys !! i want to rrb section engineer electrical(signal) previous model papers? any body help me?

1423


what is meant by poly phase induction motor ? how its operating by single phase or three phase?

1719