gas insulated transformer (2)
TRANSCRIPT
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SEMINAR REPORTON
“GAS INSULATED TRANSFORMER”
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SF6 GAS INSULATED TRANSFORMER
EMPLOYS SF6 GAS INSTEAD OF THE CONVENTIONAL OIL BOTH AS AN INSULATING AND COOLING AGENT.
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CONTENTS
SF6---AN OVERVIEWAPPLICATIONS OF A GAS INSULATED
TRANSFORMERFEATURES OF A GAS INSULATED
TRANSFORMERLAYOUT COOLING APPARATUS OF A GAS
INSULATED TRANSFORMERIMPORTANT ACCESSORIESCONCLUSION
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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.
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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.
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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.
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LAYOUT OF A GAS INSULATED TRANSFORMER
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Pressure rise on internal fault
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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
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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.
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IMPORTANT ACCESSORIES
DIAL THERMOMETER PRESSURE GAUGE TEMPERATURE COMPENSATING
PRESSURE SWITCH
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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.
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Thank you for a very patient hearing.