Answer / vinayak

ans is kva/1.732*volts

so 500kva/1.732*433 volts = 666.66amps on lv side

and 500kva/1.732*11000v= 26.24 amps on hv side

Answer / mohd mansoor

For 500 kva, It's depend on Voltage,some countryes have
different voltages, according to india,


if ur apply the formula- KVA=1.732x Volt x Amp x 0.8

1kva= 1.39 Amps,

500 kva x 1.39 = 695 Amps.

Answer / ashish

For 500 KVA Transformer the full load current is 696 Amp.
So we Can Supply the load Upto 696 Amp only....

Answer / kapil

what is .8 doing in the above formula, while the rating is
given in the KVA and not in Kwatt.

the formula is ..KVA=1.732x Volt x Amp
where voltage will be taken as 415 volt. which is very
common in 3 phase motor rating.
this will produce the same answer as above [695 amps]

Answer / jyotirmaya patra

From where you got all these voltage like 440,415,433.

The simple formulae for calculation of current I, if KVA is
given ;

I = (1000 X VA ) / 1.732 x V

So put your available system voltage and get your answer.

Answer / nwachukwu kelechi

The general formula for a 3-phase power transformer is
given by:
power(KVA)=1.732*V*I*pf.
therefore,depending on the pf under consideration, assuming
a unit power factor,500kva power and input voltage of
11000V we have;
current(I1)= 500KVA/(1.732*11000*1)=26.24Amps.
If the output voltage is 400V, the current will then be:
current(I2)= 500KVA/(1.732*400*1)= 721.7Amps.

Answer / senthil kumar.g

1 kva=1.33amps for EB
1kva=1.39amps for DG the varation is bcoz of p.f

Answer / attique ur rehman

the formula for calculating Single Phase Current is

I = 1000 * KVA/Voltage

Formula for calculating Three Phase Current is

I=1000 * KVA/voltage * 1.732

So for 500KVA we can calculate as below

I= 1000 * 500KVA/440 * 1.732 = 656.6Amps (Depending on
Voltage), if the voltage rating is changed your amps will
automatically change

Answer / kuttivenu

To calculate the Current

Kva= 1.732*V*I/1000
Ams=696A

Answer / mohamed ali.m

Formula is here

Example : 500KVA ( 500x 1000) =500000VA
: 500000/415/1.732= 695 Amps

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