Based on supply
1.Single phase transformer
2.Three phase transformer
Based on winding
1.Auto transformer (single winding)
2.Two winding transformer
3. Three winding transformer
4. Six winding transformer
Based on construction
1. Core Type transformer
2. Shell Type transformer
Based on the service
1. Distribution transformer
2. Power transformer
Based on measurement
1. Current transformer
2. potential transformer
Based on cooling
1. Dry type Transformer
2. Oil immersed type transformer
Based on function
1. Step up transformer
2.Step down transformer
3.Isolation transformer