What is the formula for calculating full load current for 1000kva transformer?

Answer 1

All what you need to do is to know the voltage rating of the secondary side

lets say that you have a transformer with the following specifications:

500 KVA, Volatge 13.8/4.16KV

So,

Full load Current= 500 / (4.16 * 1.732) = 69 Amps

Answer 2

VA is an expression of watts in alegebra.

Transformers are rated in KVA K = 1000 V= Volts A = Amps

it is a simple algebra equation V multiplied by A is watts. [single phase for simplicity]

so 25 KVA is 25,000 VA [or watts].

Watts [or VA] divided by volts gives us amps.

transformers put out and accept different voltages.

if I wanted to input 480 volts and output 240 volts. then my ampacity is based on voltage. the 25,000 VA [or watts] on the input [primary] side of 480 volts is 52 amps. [25,000 divided by 480]

so #6 AWG primaries [input] with a 50amp Over current protection [breaker or fuse]

on the output [secondaries] side 0f 240 volts the amps are double ...104 amps at 25,000 VA or 25 KVA or 25,000 watts.

[25,000 divided by 240 volts]

Answer

To find the secondary rated current, you must divide the apparent power rating (in volt amperes) by the rated secondary voltage.

Answer 3

It depends on the voltage. KVA stands for kilo-volt-amperes, so, in order to find amperes when you know kilo-volt-amperes, you have to know voltage.

As an example, a 2 KVA single phase transformer producing 240 V would be able to produce about 8.3 amperes at full load.

Answer 4

Without knowing the rated voltages of the primary and secondary windings, you cannot determine the corresponding rated currents. Once you know the rated current of the secondary winding, you can calculate the value of any load it can handle.

Incidentally, the correct symbol is 'kV.A', not'kva'.

Answer 5

The 'power rating' (actually, 'apparent-power' rating) of a transformer is the product of its secondary voltage rating and its secondary current rating. So, if you know the transformer's power rating (in your case, 1000 kV.A), then you will need to know its rated secondary voltage in order to determine its rated secondary current:

(rated apparent power)s = (rated voltage)s x (rated current)s

Answer 6

To find the rated secondary current, divide 75 kV.A (not 'kva'!) by the transformer's rated secondary voltage. To find the resulting primary current, multiply the secondary current by the reciprocal of the turns ratio (or voltage ratio).

Answer 7

Divide 25 kV.A (not 'kva'!) by the rated secondary voltage to find the secondary rated current.

Answer 8

You need to know the rated voltage of the generator to determine its rated current. Divide the number of volt amperes by the rated voltage.

Answer 9

A transformer of this size can be rated at many different amperages. The voltage that the transformer is operating at determines what the amperage will be.

Answer 10

full load I= p/(1.73*V)