This document summarizes the key components and manufacturing process of a power transformer. It discusses the core materials used, including cold rolled grain oriented silicon steel which has excellent magnetic properties and reduces hysteresis losses. It describes the winding assembly process and different types of windings like spiral, helical, and sandwich windings. It also covers the different insulation materials and methods used, as well as testing procedures to ensure quality.

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

10. 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

11. •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

12. 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.

13. 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

14. MINOR INSULATION
• Insulation between individual turns &
between layers
Conductor Insulation
• paper & cotton
• Air insulated Transformer insulation used is
glass tap

15. TRANSFORMER TANK
• Plain sheet steel Tank
• Tube Tank
• Radiator Tank
• Tank with separate coolers

17. 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

18. FINAL ASSEMBLY
• Installation of active part and assembly of
accessories
• TRANSFORMER TANK

19. WORK SHOP

20. QUALITY TEST
• Design
• Process Time
• M/C size specification
• Process of manufacturing
• Dimension specification
• Testing specification

21. THANK YOU