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- 1. SEMINAR ON POWER TRANSFORMER PRESENTED BY: ASIF AHMED
KHAN
- 2. POWER TRANSFORMER
- 3. INTRODUCTION: CORE MATERIAL Basic material are Alloy Steel
having main content Silicon & carbon Which increases
permeability & reduces losses
- 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. Power transformer core
- 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. 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. TYPE OF WINDING
- 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. 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. 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. 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. MINOR INSULATION Insulation between individual turns &
between layers Conductor Insulation paper & cotton Air
insulated Transformer insulation used is glass tap
- 14. TRANSFORMER TANK Plain sheet steel Tank Tube Tank Radiator
Tank Tank with separate coolers
- 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. FINAL ASSEMBLY Installation of active part and assembly of
accessories TRANSFORMER TANK
- 17. WORK SHOP
- 18. QUALITY TEST Design Process Time M/C size specification
Process of manufacturing Dimension specification Testing
specification
- 19. THANK YOU