TransformerTransformer

Standards

• IEC 60076Power transformers

Transformer Main Parts

1. Three-limb core2. LV Winding3. HV Winding4. Tapped Winding5. Tap Leads6. LV Bushings7. HV Bushings8. Clamping Frame9. On-Load Tap Changer10. Motor Drive11. Tank12. Conservator13. Radiators

Active Part

Active Part

Windings and Cores

Conductors

Papers

Pressboards

Oil

Bushing

Tank

Conservator

Breather

Buchholz Relay

Non Return (Shutter) Valve

Pressure relief devices

Thermometers

Oil Level Indicator

On Load Tap Changer

On Load Tap Changer

Motor Drive

Cooling System

Technical Specifications1. 3-phase unit/bank of single phase units2. Separate winding/auto transformer3. Rated voltage (HV/LV/TV)4. Rated frequency5. Cooling system6. Vector group7. Rated power9. Rated current (HV/LV/TV)10. Insulation level (HV/LV/TV/Neutral)

a) LIWL (winding /bushing)b) SIWL (winding /bushing)c) PFWL (winding /bushing)

11. Creepage distance

12. Continuous power rating at principal tap:12.1. at first stage of cooling a) HV Winding b)LV Winding c)TV Winding12.2. at second stage of cooling a) HV Winding b)LV Winding c)TV Winding12.3. at third stage of cooling a) HV Winding b)LV Winding c)TV Winding

Technical Specifications

13. Maximum temperature risea) Oilb) Windingc) Hottest spot

14. Insulation level (HV/LV/TV/Neutral)a) LIWL (winding /bushing)b) SIWL (winding /bushing)c) PFWL (winding /bushing)

15. Positive sequence impedance at 75oC on principle tapping (max./min. tap voltage) and:a) between HV & LV windingb) between HV & TV winding (if applicable)c) between TV & LV winding (if applicable)

Technical Specifications

16. Rated short circuit strength on windings (HV/LV/TV)17. Short circuit duration18. No load losses19. Load losses20. Type of winding21. Type of insulation of windings (uniform/graded)

a)HV b)LV c)TV

22. Max. sound level (dB)

Technical Specifications

23. Tap changer

a) Type (oil/vacuum) b) rated current c) rated voltage d) total range e) total number of steps f) variation per step g) position of tapping h) insulation level

Technical Specifications

Power Transformer Outline Drawing

Distribution Transformer

Distribution Transformer(Conservator Type)

Distribution Transformer(Hermetically Sealed)

Dry Type Transformer

Shunt Reactors