Answer / j.kesavan

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.

Answer / d.g.skandan

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.

Answer / mahmoud

In=p/1.732*v*p.f

=30x1000/1.732*.8*380

=57A

Ino=57/3
19A

Answer / suresh

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

Answer / suthan prabhu

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..

Answer / vikram

P = 30 kw
V= 415
I = ?
PF =0.8
p= 1.732 VI PF

I = 30000/1.732*415*0.8

I= 52.17 Amp (Full load current)

No load current will be 30% of FL current

N.L Current = 30% * 52.17

NLC = 15.65 A (Without taking Efficiency of motor into account)

Answer / surajkant

practically the no load current of 3 phase motor varies
from 25% to 35% whereas in 1phase it is nera to full laod.

Answer / s.p.singh

There is no standerd formula for calculating no load
current, It depend on the desine and material used in
motor. There is a major role of material(winding wire&
stamoing)to anhancing the efficiancy of motor.

Answer / pillay

I agree with suthan prabu. there is no formula to calculate.
depends on the manufacturers design, but full load curret can be calculated.

Answer / k.arivazhagan

3 ph induction motor will run 30% current on
no load but few motor will take 40% current


EXAMPLE:

KW=3.7KW,Amps=7.45,(Assume 40% Of No Load Amps)

No Load Amps = 7.45*0.4
= 2.98A

how give earthing to shif and aeroplane which is away from earth?

1 Answers   ABC,

15 kva dg set single phase takes 63amp( approximate) while same rating 15kva three phase takes 35amp approximate. why ? and what will be per phase current for 15 kva

2 Answers   TVI,

How shall i design a liquid rotor starter

0 Answers  

Differance between power circuit and control circuit

3 Answers  

is the surge effect the solar panel, if yes so tell me how can surge effect the panel? explain brifly

1 Answers  

can you give main difference between ELCB And RCCB?

38 Answers   MCB Bank, Reliance, Wipro,

what is a pf factor in generator.

3 Answers   CSEB,

What is the importance of counter based plan & how is it scheduled?

0 Answers   TATA,

what is subtransient , transient and study state ac components

2 Answers  

how to calculate short circuit calculation of the transformer by usuing the percentage impedence? formula needed.

2 Answers   L&T,

WHAT IS DIFFERENCE BETWEEN MANUAL CONTROL AND MAGNETIC CONTROL AND STATE ITS ADVANTAGE /DISADVANTAGE

0 Answers   Siemens,

Why we are getting low voltage in star connection?

2 Answers