Why is starter necessary for a three-phase induction motor?
Answer Posted / farha
A starter is needed for a three phase induction motor
because at the time of starting, if induction motor is
started directly, it will draw large amount of current
which causes damage to adjoining equipments.
Thus, a starter is needed in order to limit the starting
current.After the motor has started at reduced starting
current and hence reduced voltage, the connections are
diverted towards the mains supply so that now, the motor
can run at higher starting current and voltage.
Four types of starting methods are employed:
1.Star-Delta
2.Auto transformer method
3.Primary resistor starting.
4.Direct On-line.
Low rating upto 7 H.P motors can be started directly.
Is This Answer Correct ? | 607 Yes | 51 No |
Post New Answer View All Answers
what is mean by kneepoint voltage? when it will happen? ( my doubt is, if CT secondary is open means ct get saturation or blas? what are factors are required for calculations? plz give currect anws:
What is true sine wave or pure sine wave inverter?? Is it sine wave or step wave?? If it is step wave, waves with how much step is considered as pure sine wave? Is it possible to produce pure sinewave using power electronics?
What is nichols chart?
we are going to install a solar PV site and how can we calculate PV Solar Panel Efficiency, can anybody tell me complete method for its calculation.
What is the unit audit? if our Max demand is something and we found much more unit then how to improve our max demand?
What is a difference between indoor transformer and outdoor transformer of same rating
what is mind in cable
What tests should i carry over on a newly rewinded DC Generator with voltage rating of 38 volts and current rating of 350 amps, to certify that the machine is OK?
aternator every parts and its working
What will happen if we introduce negative feedback to a control system that uses a positive feedback?
Why do we need interlocking in a HT metering or Ring main unit switchgear?
What products have you designed which have entered high volume production?
What the difference between ac and dc inductor an capacitor
Describe Non I.S. Earth System and why is it used?
Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV