Answer / satish babu

The No load current depends on the Core grade used in the
transformer laminations & the flux density at which it
operates,
a) 1-2% in high quality materials
b) 5- 10% in economy grades,

Answer / harish

dear satyendra it is no load current so wt is the use of
load????
generally no load current is 5-10% of rated value , but it
further depends on type of trformer 1 or 3 phase

Answer / dennis

No Load current will depend on Core Grade, Core Thickness,
Flux Density, Frequency and the quality of workmanship (how
good are gaps closed).

Answer / j.prabhakaran

The amount of no load current can be only calculated if we
knows the value of core loss of transformer and capacitance
current across the circuit.....

Answer / dr. alaa baiumy abdel azim &a

frist we will get the rated current of the winding
I = 630 * 1000 / CUBIC ROOT OF 3 * 11 * 1000
I = 33 Amper
I NO LOAD = 0.5% OF I RATED
NO LOAD CURRENT = O.OO5 * 33
= 165 m A

Answer / nyi lwin

transformer no load current 630 KVA....1 hour unite
question

Answer / mash

it depend on the turns of coil what is the Gage of wire...

Answer / amit sonmale

Ctually No load Curent Depend on Transfarmer eficiancy To
take load.Depend on his Copper loss.

Answer / gaurav srivastava

it is a tricky question....

u know that when transformer is at no load. the secondry
windings are open...so that there is no current flow at
secondry winding...

and for primery winding we calcute these value from OPEN
CIRCUIT TEST.

that is mentioned in all books thats have transformer
chapeter...


GAURAV SRIVASTAVA (UNITED COLLEGE OF ENGINEERING AND
RESEARCH) ALLAHABAD

Answer / nilesh

630/19.05(11*1.732)=33.07amp

how will i find Transformer rating if supply voltage is 11k.v and how will i find incomer if transformer rating is 12MVA

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