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

could i arrange a faulty and healthey battery bank togather in parallel , if your ans is not then why?

3 Answers  

resistance switching is used in case of- ? a. air blast CB b. bulk oil CB c. minimum oil CB d. all types of CB

4 Answers   HCL, SSC,

Why compensation is necessary in feedback control system?

0 Answers  

Why, the starting current of 3 phase Induction Motor is 7 to 8 times its rated current?

9 Answers   L&T,

Why thwe Direction of Rotation of a TABLE Fan & CEILING Fan are different?

8 Answers   Wipro,

what is the ground fault relay,which purpose it will be use,clearly tell me plz

0 Answers  

directional over current relay when acted & how it works

3 Answers   NCC, ThyssenKrupp,

How can find thermal state value in relay for calculate thermal overload.

0 Answers  

why some transmission lines have 7 wires n why some have 3 n 4??

3 Answers  

how hydrogen or helium is a cooling agent for alternator./ generator of big size.

1 Answers  

What is rms value wher it is used??????????

1 Answers  

Why Hg means mecuiry used in vaccum mesuring unit?

2 Answers   Manhattan,