How to Calculate the Rating of Single Phase & Three Phase Transformers in kVA

How to Calculate the Rating of Single Phase & Three Phase Transformers in kVA

The rating of a transformer is the maximum amount of power that it can deliver to the load.

It is expressed in kVA (kilovolt-amps), which is the product of the voltage and current in the transformer.

The rating of a transformer depends on the number of phases, the primary and secondary voltages, and the primary and secondary currents.

To calculate the rating of a single phase transformer, you can use this formula:kVA = (V x I) / 1000where V is the voltage (in volts) and I is the current (in amps) on either the primary or secondary side of the transformer.

For example, if you have a single phase transformer with a primary voltage of 120 V and a primary current of 10 A, you can find its rating by multiplying 120 x 10 and dividing by 1000.

The result is 1.2 kVA.To calculate the rating of a three phase transformer, you can use this formula:kVA = (√3 x V x I) / 1000where √3 is the square root of 3 (approximately 1.732), V is the line-to-line voltage (in volts) and I is the line current (in amps) on either the primary or secondary side of the transformer.

For example, if you have a three phase transformer with a primary line-to-line voltage of 480 V and a primary line current of 20 A, you can find its rating by multiplying √3 x 480 x 20 and dividing by 1000.

The result is 16.6 kVA.You can also use online calculators to find the rating of transformers, such as [this one](^5^). You just need to enter the number of phases, the voltage and the current, and it will give you the kVA rating.

I hope this helps you understand how to calculate the rating of single phase and three phase transformers in kVA. If you have any other questions, please feel free to ask me. 😊