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Question
how we calculate the 30 KW 3phase electric motor current on 
noload
 Question Submitted By :: Iqbal
I also faced this Question!!     Rank Answer Posted By  
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 1
formula for no load current of 3phase electric motor

P= 1.732VI

I= P/1.732V, ur required result can be achived by putting
value in this formula
 
Is This Answer Correct ?    81 Yes 151 No
Zahid
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 2
30 KW MOTOR NOMALLY FULL LOAD 54 AMPS, BUT WITH OUT LOAD
30% CURRENT WILL TAKE,ANY THREE PHASE INDUCTION MOTOR WITH
OUT LOAD 30PERSENT CURRENT WILL TAKE.
 
Is This Answer Correct ?    134 Yes 34 No
J.kesavan
 
 
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 3
to calculate the P=root 3*line voltage *line current. By
substituting the values we can calculate fullload current
to know the no load current we have to know the RPM
usutken 40 % of full load currrent is taken on noload
 
Is This Answer Correct ?    19 Yes 44 No
Parimala
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 4
No load current of a 3phase induction motor varies
according to its KW and rpm. Normally as a thumb rule
fraction HP motors (below 2.2KW) will be 50% of full load
current. Above 2.2KW may be 20% to 30% OF full load
current.
 
Is This Answer Correct ?    54 Yes 14 No
D.g.skandan
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 5
no standerd farmulla to calculate the noload current but as
a thumbrule 3 ph induction motor will draw 30% current on
no load but few motor will take 50 to 60 % current
 
Is This Answer Correct ?    43 Yes 8 No
Suresh
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 6
practically the no load current of 3 phase motor varies
from 25% to 35% whereas in 1phase it is nera to full laod.
 
Is This Answer Correct ?    19 Yes 13 No
Surajkant
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 7
Actually,there is no standard formula to calculate the
noload current of the motor.Normally 25% to 40% of full
load current of the motor.Also depending upon motor KW and
supplier..
 
Is This Answer Correct ?    33 Yes 3 No
Suthan Prabhu
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 8
I agree with suthan prabu. there is no formula to calculate.
depends on the manufacturers design, but full load curret can be calculated.
 
Is This Answer Correct ?    15 Yes 9 No
Pillay
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 9
Simply take the formula of

KW = 1.732 * V * I * cos phi

ie

30 = 1.732*415*I*.8
[as voltage is 415v & in our country standard p.f 0.8]

I = 52.166 Amps
 
Is This Answer Correct ?    30 Yes 75 No
Partha
 
  Re: how we calculate the 30 KW 3phase electric motor current on noload
Answer
# 10
In=p/1.732*v*p.f

=30x1000/1.732*.8*380

=57A

Ino=57/3
19A
 
Is This Answer Correct ?    47 Yes 25 No
Mahmoud
 

 
 
 
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