Why is starter necessary for a three-phase induction motor?
Answer Posted / subhakanta sahu
As we know at the time of starting an induction motor the rotor is stand still hence the slip is 1.if slip is 1 the rotor induced voltage is maximum hence drives maximum current in the rotor circuit.This rotor current current has impact on stator current(As per LENZ's law).This is the reason why an induction motor takes high current at starting(About 5 to 7 times the full load current).
This high current causes voltage fluctuation,unwanted power loss & unwanted stress to the system or equipment.So it has to be reduced by using different starting methods.
There are two possible ways to limit the starting current
1.Reduce the applied voltage.
2.Increase the rotor resistance.
Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
what is an unbalance in acircuit? in a three phase 3wire circuit how an unbalance will come? in a three phase four wire system how an un balance is coming?
Draw the line diagram of diffretial relay connected to transformer?
before synchronizing an alternator,power factor is leading ,why?
sir,in our plant we r using SATEC PM172E power reading meeters in HT panel side it is monitoring the MB data smart viewer(sever).but last one week we did not get readings inthe server only available in meeter.tell me how communicate meter and server. and also what steps we take for checking.
What is Traction? 1KVA Alternator, How much urrent taken?
sir i had plane to do some project with the base of hopkinson test in AC supply its possible
describe the Operation of induction generators from bus bars
What is magneto on a gas generator. how it functions. its out put is d.c or a.c. how it can be checked for correct functioning
hey guys help me out.....what are the industrial uses/functions of nozzles in industries
Please provided formula for calculate the cable size from step up transformer to M.V panel, run overhead aluminum cables, total load is 5mega watt, total length 900 feet.
If o/p power is doubled by how much does the sound increase
Who are the manufacturer for Nitrogen based Fire Protectio/explosion prevention for Oil Filled Transformers? India and international both?
what is vtg limit of earth and neutral at transformer side?
How relay works, reverse relay, master relay, os relay, earth fault relay and what is its setting point
how can maintain the power factor and why and this is how do work tell us