Adapun bagian-bagian dari transformator daya antara lain :
1. Electromagnetic Circuit (Inti besi)
2. Current carying circuit (Winding)
3. Bushing
4. Pendingin
5. Oil preservation & expansion (Konservator)
6. Dielectric ( Minyak isolasi transformator & Isolasi kertas )
7. Tap Changer
8. NGR (Neutral Grounding Resistant)
9. Proteksi transformator