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A transformer bank is rated at 300kva and consists of three 100kva transformers has a three phase 480v delta primary and a 120v/240v 3phase, 4 wire delta connected secondary. What is the calculated rating of the transformers primary and secondary currents?

Respuesta :

The rating of the transformers primary and secondary currents will be 360.8A and 180.4A.

How to calculate the current?

From the information given, the rating of the transformer bank is given as 300kVA. The full load primary current will be:

✓3 × V × I = 300 × 10³

✓3 × 480 × I = 300 × 10³

I = 360.8A

Also, the secondary load current will be calculated thus:

Transformation ratio = 240/480 = 0.5

Load current = 360.8 × 0.5

= 180.4 A

In conclusion, primary and secondary currents will be 360.8A and 180.4A.

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