What is the Formula to calculate KVA?

Answer 1

(volts x amps)/1000

Answer

The 'volt ampere' (V.A) is the unit of measurement for apparent power of a load, and is the product of the supply voltage and the load current. To convert volt amperes into kilovolt amperes, divide by 1000.

Answer 2

to calculate kva rating of single phase transformer:

kva rating= Q =Vp * Ip * 10^-3

where,

Vp= terminal voltage of primary winding

Ip= current of primary winding

so,

Q = V * I *10^-3

=2.22 * f * phi *Kw *Aw *delta * 10 ^-3

where,

f= frequency in hertz

phi= maximum flux in weber

Kw=window space factor

Aw=window area in m2

delta= current density in A/m2

but,

phi (maximum flux) =maximum flux density * net area of core

=Bm * Ai

so,

Q=2.22 * f *Bm * Ai *Kw *Aw *delta * 10 ^-3 kva

to calculate three phase transformer,

Q= 3.33 *Bm* Kw* Aw*Ai * 10 ^-3

Answer 3

it's the transformer capacity power

Answer

It's the product of the transformer's secondary rated voltage and rated current. And the correct symbol is kV.A.

Answer 4

http://www.federalpacific.com/university/transbasics/chapter2.html