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BIT Mesra Jaipur Summer Training on Manufacturing of Distribution Transformers
1. Birla Institute Of Technology
Mesra , Jaipur Campus
SUMMER TRAINING
[1st June ā 28th July 2022]
Name- Shashank Bhadouria
EEE-VII -SEM
2. Contentsā¦..
ā® Objective
ā® Company Profile
ā® Basic Theories
ā® Working Principle of Transformer
ā® Distribution Transformer
ā® Oil immersed distribution Transformer
ā® Manufacturing of 3-Phase Distribution Transformer
ā® Recommendations
3. objeCtivesā¦..
ā®To apply theoretical knowledge in the practical field
ā® To observe the manufacturing process of distribution transformer, testing
ā®Collecting knowledge regarding distribution transformer
ā®Developing skills and techniques relevant to our careers
4. Company profileā¦.
ā® Name: Crompton
ā® Factory location: DLF Phase III, DLF Cyber City, DLF Phase 2, Sector 24, Gurugram,
Haryana
ā® Ownership: Crompton Greaves Consumer Electricals Limited
6. Distribution
transformerā¦..
ā® Used for distribution of electrical energy
ā® Generally, operates at low voltage as less than 33KV in
industrial purpose and 440v-220v in domestic purpose
ā® 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
13. Core materialā¦.
ā® The mostly used core
material is CRGO-Cold
Rolled Grain Oriented steel
sheets of 3% of Silicon
ā® Thickness of the CRGO
sheets usually 0.27 mm
ā® Oxide coating is provided
for CRGO laminations to
reduce eddy current losses
15. Core jointing on Channelā¦.
ā® This is the simplest form of joints
ā® The flux leaves and enters at the joint in
perpendicular
16. ā® Placing laminated sheets by hand or
hammer manually
ā® No air gap between the joints of two
consecutive sheets
ā® The entire assembly is done on a frame
commonly known as core channel
ā® These frames being used as a clamping
support of the core assembly
17. Covering Copper wire with insulating tapeā¦..
ā® The mostly used
material for winding
wires or strips is
copper .
ā® The copper wires or
strips are wrapped by
insulating tape or DPC
paper.
18. low voltage windingsā¦..
Vertical machine is used to prepare the
LV winding
The helical and double layers
Number of turns varies on KVA
rating
19. low voltage windingsā¦..
Starting End
Finishing End
Gape between two layers
ā® Greater simplicity in fitting
cooling ducts
ā® More even heat
distribution through the
windings
20. high voltage windingsā¦.
ā® Horizontal machine is used to prepare the
HV winding
ā® HV windings are of layered construction
ā® The conductors are made of more round
wires, either with an insulating paper
ā® The insulation between the layers
consists of DPC paper
28. Placement of HV
Winding:
Contd.
ā®This coil is placed on LV winding as
second layer of core
ā® First LV coil then HV coil
ā®The gap between the LV and HV coil
is filled with runner of pressed board
31. Vector grouping.....
The vector grouping in NEL is Dyn
11:
ā® Delta connected HV winding
ā® Star connected LV winding
ā® Neutral brought out
ā® LV is leading HV with 30Ā°
(11 oāclock)
32. taap Changerā¦..
ā® Tapping is terminated
just bellow oil level
ā® External
handle
ā® Taping is done on HV
winding
ā® Used to regulate the
output voltage to
required levels
Tap Changer
Exterrnal Handle
34. moisture Controlā¦..
ā® The whole active part of the transformer
in the heat chamber
ā® Keeping it there for 72 to 96 hours with
a continuous heating temperature of
100Ā° - 141Ā° C to clean the moistures in it
ā® Bringing it out after getting proper
insulation
36. Functions of Transformer Tank...
ā® A container for the cooling
liquid
ā® Providing shielding
against electromagnetic
field leakage
37. radiatorā¦.
ā® Made steel like
tank
ā®Attached with the
tank
ā®Radiate the heat
from insulating oil
and makes the oil
cool
38. inserting the aCtive part into the tankā¦..
ā® Whole active part is covered by
press board
ā® Crane is used to lift the active part
ā® By handling a chain the active part
is put slowly in the tank
39. bushingsā¦.
ā® Counteracting the electrical field
strength
ā® Insulating the incoming or outgoing
conductor into or out of the transformer
tank
Conductor
Insulator
40. Conservatorā¦.
ā® Providing adequate space for
expansion of oil inside the tank
ā® It also acts as a reservoir for the
insulating oil.
ā® The oil level indicator indicates the
oil level
ā® Oil level should not fall below
minimum limit
42. funCtion of transformer oilā¦.
ā® Providing dielectric strength
to the insulation system
ā® Providing efficient cooling
ā® Protecting of the transformer
core and coil from chemical
attack
43. QC testsā¦.
Testing of Distribution Transformer:
ā® Insulation test
ā® Ratio test
ā® Open circuit test
ā® Short circuit test