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

WHAT IS MEANT BY DERATING OF THYRISTOR?

0 Answers   TATA, Trane,

What difference between ref protection and differential protection ?

0 Answers   EPC, INEL Power System Engineers,

Determine the BTU size of an aircon for 20 sq metre room

0 Answers  

What is full form of ELECTRICAL?

3 Answers   Changwoon, DP World, Electrical, GSS, HCL, ITI, L&T, Maruti Suzuki, MCC, SMR, Somany Ceramics, TRDP, Wipro,

What are applications of Shunt release?

2 Answers   Techno Electric and Engineering,

What the formula for calculating no.of earthings & size of earth strip for 100mX90m shop.

0 Answers  

how tubelight circuit is connected and how it works?

7 Answers   Punj Lloyd Ltd,

when the rheostat kept in minimum to maximum position in motors what will happen?

7 Answers  

I want to measure resistance between Neutro and earth conductor for 3 phase Transformer what should i do

1 Answers  

what is the most probable reason of failure of current transformer?

2 Answers   L&T,

what are the reasons of low voltage during start the DG?

1 Answers   Godrej, Tata Power,

what is the difference SCR & TRIAC?

13 Answers   TCS,