SEMINAR REPORTON

“GAS INSULATED TRANSFORMER”

SF6 GAS INSULATED TRANSFORMER

EMPLOYS SF6 GAS INSTEAD OF THE CONVENTIONAL OIL BOTH AS AN INSULATING AND COOLING AGENT.

CONTENTS

SF6---AN OVERVIEWAPPLICATIONS OF A GAS INSULATED

TRANSFORMERFEATURES OF A GAS INSULATED

TRANSFORMERLAYOUT COOLING APPARATUS OF A GAS

INSULATED TRANSFORMERIMPORTANT ACCESSORIESCONCLUSION

SF6 – AN OVERVIEW

SF6 is Sulphur hexafluoride formed by chemical reaction of molten sulphur and fluorine.

It is colorless, odorless, nonflammable, non-corrosive and chemically stable.

High dielectric strength. Quenches arc effectively and has excellent

cooling properties. Good thermal conductivity and excellent thermal

stability. It’s not poisonous and eco-friendly. It can be recycled.

APPLICATIONS OF SF6 GAS INSULATED TRANSFORMER

Hospitals, underground shopping centers, substations where a high level of fire safety is required.

Water treatment plants and hydroelectric power plants where waterways must be kept unpolluted.

Thermal power plants, chemical plants, public works facilities etc where high reliability is required.

FEATURES OF A GAS INSULATED TRANSFORMER

Highly flame resistant and non explosive.High resistance to moisture.Reduced installation space.High reliability.Causes no pollution.Explosion proof tank.Easy inspection and maintenance work.

LAYOUT OF A GAS INSULATED TRANSFORMER

Pressure rise on internal fault

CONSTRUCTIONAL FEATURES

Constructional Features

Oil Immersed Transformer

(OIT)

Gas Insulated Transformer

(GIT)

Insulation/Cooling Insulating Oil SF6 (Pressure 0.14 or

0.43MPa-g)

Solid Insulation Material

Oil Impregnated Paper, Pressboard

PET Film, PPS Film, Aramide Paper,

Pressboard

Conservator Necessary Unnecessary

On Load Tap Changer

Arcing Switching in Oil

Vacuum Interrupter

COOLING APPATARTUS

Employs a cooling medium in liquid phase such as a Refrigerant R113 otherwise known as Trifluorotrichloroethane or C2F3Cl3.

SF6 gas is obviously used as the second cooling medium.

IMPORTANT ACCESSORIES

DIAL THERMOMETER PRESSURE GAUGE TEMPERATURE COMPENSATING

PRESSURE SWITCH

CONCLUSION Incessant research and continuous

developments have made construction of large capacity gas insulated transformer possible.

With the eco-friendly aspects of SF6 gas and considering the huge advantages of the gas, long strides can be made in this regard to further utilize it and increase the efficiency of the transformer and making the power system more reliable and safer.

Thank you for a very patient hearing.