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1. TECHNOLOGICAL UNIVERSITY(MYITKYINA)
DEPARTMENT OF ELECTRICAL POWER ENGINEERING
DESIGN CALCULATION OF
DISTRIBUTION TRANSFORMER (315KVA)
BE Mini Thesis
Title Defense
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Presented by;
Mg Sai Seng Pha
Supervised by;
Daw
Date – 28.8.2022

2. Outlines of Presentation
Introduction
Aim and Objectives
Implementation Program
Outlines of thesis
Distribution Transformer (315 KVA)
Main Parts of Distribution System
Conclusion
Future Plan
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3. Introduction
 Distribution transformer is a static device which is
constructed with two or more windings.
 Distribution transformer require minimum maintenance to
provide many years of reliable trouble free service.
 Distribution transformer can energized for 24 hours a day
even when they don't carry any load.
 Distribution transformer not only help to distribute the
correct levels of energy but also they combat energy waste
and core losses too.
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4. Aim and Objectives
To be safe for people and property
To be easy installation
To change from high voltage to low voltage, used in homes and
businesses
To have small leakage reactance
To achieve the best use of materials and to minimize costs
To distributed electrical energy from power generation plant 4

5. Implementation Program
Describing the general awareness of transformers
Studying the transactions, structures and design calculation of
distribution transformer.
Calculating the core and winding design
Studying about the accessories of distribution transformers
Calculating the temperature rise, voltage regulation, losses and
transformer efficiency
Comparison of test data and designed calculations
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6. Outlines of Presentation
Chapter (1) Introduction
Chapter (2) Overview of Distribution Transformer
Chapter (3) Design Calculation of 315 KVA Distribution Transformer
Chapter (4) Discussion and Conclusion
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7. Distribution Transformer (315 KVA)
A transformers consist of a magnetic core made from laminations of
sheet silicon steel (transformer steel) stacked.
A Transformer in which the core and windings are immersed in an
insulating liquid.
A transformer bring down (step down) the voltage and incidental level
of a power transmission line to a predetermined scale like 240/120 V.
A Transformer mainly work at efficiency at 60-70%, small size and
light, easy in installation, having low magnetic losses.
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8. Main Part of Distribution Transformer
Laminated Core
Windings
Insulating Material
Transformer Oil
Tap Charger
Oil Conservator
Breather 8

9. Continues,
Cooling Tubes
Buchholz Relay
Explosion Vent
Radiator
Breather Unit
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10. Conclusion
The selection of core diameter, flux density, core length, type of
winding and tap charger are relatively important to do the design of
distribution transformer.
The transformer oil is the most important of all insulating materials
used in transformers.
Four step cores are used for transformer design and this step core is
flexible for chosen rating.
Temperature rise is limited to avoid damage to insulation and inner
fault.
Both sides of primary and secondary windings are wound based on
the calculation of number of turns to be convenient for the users. 10

11. Future Plan
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