1. 1. SEMINAR ON POWER TRANSFORMER PRESENTED BY: ASIF AHMED KHAN
2. 2. POWER TRANSFORMER
3. 3. INTRODUCTION: CORE MATERIAL Basic material are Alloy Steel having main content Silicon & carbon Which increases permeability & reduces losses
4. 4. CONTD.. CRGO (cold rolled grain oriented silicon steel) CRGOS shows excellent Magnetic properties. The purpose of using CRGO is to reduce the hysteresis losses. So CRGOS is more used
5. 5. Power transformer core
6. 6. CORE AND ACTIVE PART ACTIVE PART C.R.G.O. STRIPS 1-STRIP HAS WIDTH OF 0.27 mm COIL OR WINDING ASSEMBLY PROCEDURE Manufacturing of LIMB Core Insulation
7. 7. CORE AND ACTIVE PART Removal of TOP FRAM for Coil assembly Winding insulation detail TOP YOKE FILLING VAPOUR PHASE OVEN HV & LV leads from top & bottom to the bushings REGULATING COILS to the tap changer
8. 8. TYPE OF WINDING
9. 9. SPIRAL It is used 100 A& for low Voltage Winding Mechanically very strong Helical Intermediate range of current Suitable for LV winding of large transformer
10. 10. Cross-over suitable of current not exceeding 20 A. Use for HV winding of small transformer Continuous disc: No of turns wound radially over one another separated by spacers HV winding Mechanically strong Cross over
11. 11. Sandwich mostly used for shell type transformer Control leakage reactance HV & LV are near so leakage flux is reduced mmf of each section is same.
12. 12. INSULATION kinds of Insulations: Major Insulation: Insulating between LV & core Also between HV & LV Insulating barriers between limbs, coils & core yoke Oil impregnated paper used as it has high dielectric strength
13. 13. MINOR INSULATION Insulation between individual turns & between layers Conductor Insulation paper & cotton Air insulated Transformer insulation used is glass tap
14. 14. TRANSFORMER TANK Plain sheet steel Tank Tube Tank Radiator Tank Tank with separate coolers
15. 15. TRANSFORMER OIL Double purpose , cooling & Insulating Permittivity is 2.5 Breakdown strength of oil used must be 50kv RMS Major disadvantage is sluging To overcome this, synthetic oil is prefered
16. 16. FINAL ASSEMBLY Installation of active part and assembly of accessories TRANSFORMER TANK
17. 17. WORK SHOP
18. 18. QUALITY TEST Design Process Time M/C size specification Process of manufacturing Dimension specification Testing specification
19. 19. THANK YOU