What Is A Transformer? It’s Types And Working

The coils are former wound and mounted in layers stacked with insulation between them. A shell type transformer may have a simple rectangular form (as shown in above fig), or it may have a distributed form.

(B) On the basis of their purpose

1. Step up transformer: Voltage increases (with a subsequent decrease in current) at secondary.
2. Step down transformer: Voltage decreases (with subsequent increase in current) at secondary.

(C) On the basis of type of supply

1. Single phase transformer
2. Three phase transformer

Also Read: Induction motor definition and working principles

(D) On the basis of their use

1. Power transformer: Used in transmission network, high rating
2. Distribution transformer: Used in distribution network, comparatively lower rating than that of power transformers.
3. Instrument transformer: Used in relay and protection purpose in different instruments in industries
   • Current transformer (CT)
   • Potential transformer (PT)

(E) On the basis of cooling employed

1. Oil-filled self cooled type
2. Oil-filled water cooled type
3. Air blast type (air cooled)

Working Of Transformer –