![Birla Institute Of Technology
Mesra , Jaipur Campus
SUMMER TRAINING
[1st June – 28th July 2022]
Name- Shashank Bhadouria
EEE-VII -SEM](https://image.slidesharecdn.com/summertrainingpptfinal-221109034507-5a4c12b7/85/SUmmer-Training-PPT-FINAL-pptx-1-320.jpg)
SUmmer Training PPT FINAL.pptx
- 1. Birla Institute Of Technology Mesra , Jaipur Campus SUMMER TRAINING [1st June – 28th July 2022] Name- Shashank Bhadouria EEE-VII -SEM
- 2. Contents….. ⮚ Objective ⮚ Company Profile ⮚ Basic Theories ⮚ Working Principle of Transformer ⮚ Distribution Transformer ⮚ Oil immersed distribution Transformer ⮚ Manufacturing of 3-Phase Distribution Transformer ⮚ Recommendations
- 3. objeCtives….. ⮚To apply theoretical knowledge in the practical field ⮚ To observe the manufacturing process of distribution transformer, testing ⮚Collecting knowledge regarding distribution transformer ⮚Developing skills and techniques relevant to our careers
- 4. Company profile…. ⮚ Name: Crompton ⮚ Factory location: DLF Phase III, DLF Cyber City, DLF Phase 2, Sector 24, Gurugram, Haryana ⮚ Ownership: Crompton Greaves Consumer Electricals Limited
- 6. Distribution transformer….. ⮚ Used for distribution of electrical energy ⮚ Generally, operates at low voltage as less than 33KV in industrial purpose and 440v-220v in domestic purpose ⮚ Three phase distribution transformers ,widely used in 11kv distribution line to step down the voltage level.
- 7. Basic Theories.. 7 1. Transformer is an electrical device that transfer electric power from one circuit to another 2. It does so without a change of frequency 3. It accomplishes this by electromagnetic induction 4. Where the two electric circuits are in mutual inductive influence of each other
- 8. oil immersed distribution transformer….
- 9. Manufacturing of 3-Phase Distribution Transformer
- 11. ⮚ Active Part : The ferromagnetic core and windings
- 13. Core material…. ⮚ The mostly used core material is CRGO-Cold Rolled Grain Oriented steel sheets of 3% of Silicon ⮚ Thickness of the CRGO sheets usually 0.27 mm ⮚ Oxide coating is provided for CRGO laminations to reduce eddy current losses
- 14. Core Cutting…. Straight type core cutting
- 15. Core jointing on Channel…. ⮚ This is the simplest form of joints ⮚ The flux leaves and enters at the joint in perpendicular
- 16. ⮚ Placing laminated sheets by hand or hammer manually ⮚ No air gap between the joints of two consecutive sheets ⮚ The entire assembly is done on a frame commonly known as core channel ⮚ These frames being used as a clamping support of the core assembly
- 17. Covering Copper wire with insulating tape….. ⮚ The mostly used material for winding wires or strips is copper . ⮚ The copper wires or strips are wrapped by insulating tape or DPC paper.
- 18. low voltage windings….. Vertical machine is used to prepare the LV winding The helical and double layers Number of turns varies on KVA rating
- 19. low voltage windings….. Starting End Finishing End Gape between two layers ⮚ Greater simplicity in fitting cooling ducts ⮚ More even heat distribution through the windings
- 20. high voltage windings…. ⮚ Horizontal machine is used to prepare the HV winding ⮚ HV windings are of layered construction ⮚ The conductors are made of more round wires, either with an insulating paper ⮚ The insulation between the layers consists of DPC paper
- 22. Contd. Insulation between two layers : Insulation between two layers of DPC paper
- 23. Core-Coil assembly….. Opening the upper yoke
- 24. Insulating between core and LV winding Cotton tape Press board Contd.
- 25. Placement of LV Winding: ⮚ The LV windings in the core limb . ⮚ They are fitted tightly in all three limb using pressed board. Contd.
- 26. Contd. Press Board Cutting DPC Paper Isolating HV from LV winding:
- 27. Contd. Before inserting the HV winding
- 28. Placement of HV Winding: Contd. ⮚This coil is placed on LV winding as second layer of core ⮚ First LV coil then HV coil ⮚The gap between the LV and HV coil is filled with runner of pressed board
- 29. ConneCtions….. HV Side ( Delta Connection) LV Side (Star Connection)
- 30. Contd.
- 31. Vector grouping..... The vector grouping in NEL is Dyn 11: ⮚ Delta connected HV winding ⮚ Star connected LV winding ⮚ Neutral brought out ⮚ LV is leading HV with 30° (11 o’clock)
- 32. taap Changer….. ⮚ Tapping is terminated just bellow oil level ⮚ External handle ⮚ Taping is done on HV winding ⮚ Used to regulate the output voltage to required levels Tap Changer Exterrnal Handle
- 33. Taping Wires Connected to HV coils Changer How Tapping done: p e
- 34. moisture Control….. ⮚ The whole active part of the transformer in the heat chamber ⮚ Keeping it there for 72 to 96 hours with a continuous heating temperature of 100° - 141° C to clean the moistures in it ⮚ Bringing it out after getting proper insulation
- 35. the tank…..
- 36. Functions of Transformer Tank... ⮚ A container for the cooling liquid ⮚ Providing shielding against electromagnetic field leakage
- 37. radiator…. ⮚ Made steel like tank ⮚Attached with the tank ⮚Radiate the heat from insulating oil and makes the oil cool
- 38. inserting the aCtive part into the tank….. ⮚ Whole active part is covered by press board ⮚ Crane is used to lift the active part ⮚ By handling a chain the active part is put slowly in the tank
- 39. bushings…. ⮚ Counteracting the electrical field strength ⮚ Insulating the incoming or outgoing conductor into or out of the transformer tank Conductor Insulator
- 40. Conservator…. ⮚ Providing adequate space for expansion of oil inside the tank ⮚ It also acts as a reservoir for the insulating oil. ⮚ The oil level indicator indicates the oil level ⮚ Oil level should not fall below minimum limit
- 41. filling oil…..
- 42. funCtion of transformer oil…. ⮚ Providing dielectric strength to the insulation system ⮚ Providing efficient cooling ⮚ Protecting of the transformer core and coil from chemical attack
- 43. QC tests…. Testing of Distribution Transformer: ⮚ Insulation test ⮚ Ratio test ⮚ Open circuit test ⮚ Short circuit test