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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