Transformer Standards IEC 60076 Power transformers Transformer Main

Transformer Main Parts 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.

Technical Specifications 1. 3 -phase unit/bank of single phase units 2. Separate winding/auto transformer

Technical Specifications 12. Continuous power rating at principal tap: 12. 1. at first stage

Technical Specifications 13. Maximum temperature rise a) Oil b) Winding c) Hottest spot 14.

Technical Specifications 16. Rated short circuit strength on windings (HV/LV/TV) 17. Short circuit duration

Technical Specifications 23. Tap changer a) Type (oil/vacuum) b) rated current c) rated voltage

Distribution Transformer (Conservator Type)

Distribution Transformer (Hermetically Sealed)

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Transformer

Standards • IEC 60076 Power transformers

Transformer Main Parts 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Three-limb core LV Winding HV Winding Tapped Winding Tap Leads LV Bushings HV Bushings Clamping Frame On-Load Tap Changer Motor Drive Tank Conservator Radiators

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

Motor Drive

Cooling System

Technical Specifications 1. 3 -phase unit/bank of single phase units 2. Separate winding/auto transformer 3. Rated voltage (HV/LV/TV) 4. Rated frequency 5. Cooling system 6. Vector group 7. Rated power 9. 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

Technical Specifications 12. Continuous power rating at principal tap: 12. 1. at first stage of cooling a) HV Winding b)LV Winding c)TV Winding 12. 2. at second stage of cooling a) HV Winding b)LV Winding c)TV Winding 12. 3. at third stage of cooling a) HV Winding b)LV Winding c)TV Winding

Technical Specifications 13. Maximum temperature rise a) Oil b) Winding c) 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 75 o. C on principle tapping (max. /min. tap voltage) and: a) between HV & LV winding b) 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 duration 18. No load losses 19. Load losses 20. Type of winding 21. Type of insulation of windings (uniform/graded) a)HV b)LV c)TV 22. Max. sound level (d. B)

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

Power Transformer Outline Drawing

Distribution Transformer

Distribution Transformer (Conservator Type)

Distribution Transformer (Hermetically Sealed)

Dry Type Transformer

Shunt Reactors