Welcome to my Presentation On Transformer

Presented By Emon Arifin Shakil ID#09305034

• • • • • • • • • • • Step down transformer Step up transformer Core type Transformer Shell type transformer Spiral core type transformer Distribution Transformer Power Transformer Current transformer Potential transformer Single phase transformers Poly phase transformer

Components of a Transformer

• • • • • • • • Winding Iron core Transformer tank Yoke Conservator Transformer Oil Bushing Oil level indicator • • • • • Breather Radiator tubes for cooling Tap changer Buchholz relay Thermo-meter

6

Types of winding

• • • • Cylindrical winding Distributed Cross-over Windings Spiral Winding Helical Winding Fig: Cylindrical winding Fig: Spiral winding Fig: Helical winding

7

Bushing

Low voltage bushing • • The insulation of the terminals of winding. These bushings are made of well china clay. These are housed on the upper side of tank through winding bushing gasket.

line and terminals of the is provides Service connected through bushing.

High side bushings are large and low side bushings are small High voltage bushing

8

Conservator

• It is transformer oil storage tank and if the main tank oil reduces the conservator will feed the oil to main tank.

• And if the oil get expansion that oil will go to conservator Fig: Conservator

9

Breather

• • A transformer breather is an • accessory of an oil filled type transformer which is attached into the oil conservator tank.

It protect moisture entering the conservator tank.

Sili ca gel • In the refrigeration breather system, an air dryer is fitted to the conservator vessel.

• Fig: Breather

1 0

Assembling of Transformer

1 7

Connection

• • LT/secondary winding uses delta connection HT/primary winding uses star or Y connection • • A delta system is a good short distance distribution system.The delta system can be illustrated by a simple triangle. A wire from each point of the triangle would represent a three-phase, three-wire delta system. The voltage would be the same between any two wires. Description of star connection Fig: Delta- Wye connection

2 1

• Y Y Connection Use : rare, don't use causes harmonics and balancing problems • Y Δ Connection Use : high voltage transmissions.

• Δ Δ Connection Use: Industrial applications.

Cont.

Fig: Wye-Wye connection

2 2

Cont.

2 3