Applications

Power Transformer

These transformers are used to step-up voltage at the generating station for transmission purposes and then step-down the voltage at the receiving sub-station.

Distribution Transformer

These transformers are installed at the distribution sub-stations (in localities) to step-down the voltage value.

Capacity

 Power Transformer

The rating of such transformer is more than 500 KVA.

Distribution Transformer

The rating of such transformer is upto 500 KVA.

Cooling

 Power Transformer

These transformers may be self oil cooled, forced air cooled or forced water cooled.

Distribution Transformer

These transformers may be Air natural cooled or oil natural cooled. They are of self cooling type and are almost invariably oil immersed.

Losses

 Power Transformer

These transformers are usually designed to operate at full load, which would cause continuous capacity copper losses, thus affecting their efficiency. To have minimum losses during 24 hours, such transformers are designed with low copper losses.

Distribution Transformer

In such transformers, iron loss occurs for all the time where the copper loss occurs only when they load. Therefore, distribution transformers should be designed with iron loss in comparison to the full load copper loss.

Connections

 Power Transformer

These transformers may be single phase or three-phase; three-wire delta/delta or delta/star connected.

Distribution Transformer

Such transformers are usually three-phase; four wire, delta/star connected.