Question

A 100 kva, 2000/200 v, 1-phase two-winding transformer is to be used as an auto-transformer for stepping up the voltage from 2000 v to 2200 v. for the autotransformer, determine the following:

(a) voltage and current rating

Answer 1

The voltage rating for the autotransformer is 2200 V and the current rating is 50 A.

Step-by-step explanation:

An autotransformer is a type of transformer that uses a single winding and is used to step up or step down the voltage. In this case, we have a 100 kVA, 2000/200 V, 1-phase autotransformer.

Since the transformer is used as an autotransformer to step up the voltage from 2000 V to 2200 V, the voltage rating for the autotransformer is 2200 V.

The current rating of the autotransformer can be calculated using the formula:

Current Rating = KVA Rating / Voltage Rating

Plugging in the given values, we get:

Current Rating = 100 kVA / 2000 V = 0.05 kA = 50 A