Observes heat

Indicate oil level

Prevents the moisture entry

Reduces tank pressure

To minimise the hysteresis losses

To minimise the eddy current loss

To minimise the copper loss

To minimise the friction loss

To avoid leakage of flux

To reduce the tank size

For effective cooling

To reduce copper loss

Instrument transformer

Ignition transtor

Scott connected transformer

Isolation transformer

Air core transformer

Shell type transformer

Audio frequency transformer

Instrument transformer