i have a 160 kw 4pole, 415v 50hz motor, iam want to know if i can use a soft starter to run it. will i need to power this motor by electrical genset? my locked rotor current is 2076 amps, will i need a bigger alternator (2500kva to 3000kva)
Why not. Your 160KW motor running ampere is about 262 Amp. You have to select a good soft-starter that able to ram from 0 current to its maximum full load current. This, it help you to reduce your motor starting current problem and you don't have to get a very big alternator (generator set).
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If you use DOL (Direct On Line) starting, your generator set capacity should be minimum 4 x 160 = 640 KW
If you use soft starter, then 450 KW generator set should work.
The extra capacity is needed only during the starting of the motor.
- MS
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its suitable to use a soft starter to run this motor, but what will be the full load amps and locked rotor current when using soft starter? the aim is to use soft starter to reduce the size of the alternator and to determine which size alternator is suitable?
It is very difficulty for us to determine the correct alternator for you. I don't have much information of what will be your actual connected load or future connected load or how much power will be taken from this generator.
For example, since you have a 160KW motor with 4 pole, 50Hz the nominal running current for your motor is about 262 ampere. The alternator you required is 230KVA. This is, with condition, that you have to get a soft-starter that able to ramps from 0 ampere to the motor full load current of 262 ampere.
But in reality, as an electrical engineer, we always take few factors in to consideration and do some study for the future electrical additional load that may taken the supply from this generator.
Here is the formula for calculate your alternator.
Motor running current = 262 Amps
Voltage = 415 V,
KVA (Alternator) = (V*I*1.732)* 20% for extra some power
KVA (Alternator = 226 KVA ~ 230KVA
Well you can size your own alternator using the above formula.
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Motors and Soft Starters
Re: can i use a soft starter
