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How to calculate Primary current of any transformer in just 2 steps!

How to calculate Primary current of any transformer in just 2 steps! 1024 576 Gaurav Joshi

In this tutorial, I’ll explain 2 simple steps from which you can calculate primary current of any transformer. Transformer can be 1 phase or 3 phase. So, let’s get started.

Step 1

Get the following details
  • KVA/MVA rating of a transformer (For this example, assume KVA = 100)
  • Primary Voltage of transformer (Assume 11kV)

Step 2

Put the details obtained in Step 1 in the following formula

For 3 phase transformers

I_{Primary}={{KVA\times 1000}\over \sqrt3\times V_{Primary}}

Let’s put the values we assumed in Step 1 in above formula.

I_{Primary}={{100\times 1000}\over\sqrt3\times 11000}

I_{Primary}=5.25 A

For 1 phase transformers

I_{Primary}={{KVA\times 1000}\over \ V_{Primary}}

So, these are the two simple steps you can use to calculate the primary current of any single phase or three phase transformer.

In case, you are interested is knowing the 3 simple steps to calculate the short circuit current of any transformer, click here.

Gaurav Joshi

Gaurav, also known as TheElectricalGuy, is an accomplished electrical engineer with over 8 years of experience in the high and medium voltage switchgear industry. In addition to his professional endeavors, Gaurav has made significant contributions to the global electrical engineering community through his highly successful YouTube Channel. With over 195K subscribers and a prestigious silver play button from YouTube, he has become a trusted resource for electrical engineers worldwide. Gaurav's dedication to sharing knowledge extends to the creation of comprehensive courses, which have already attracted over 3000 students eager to enhance their skills in the field.

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