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SEMINAR REPORT ON “GAS INSULATED TRANSFORMER”
Submitted By:-CHANDAN KUMAR SINHA
[1222004]
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
ELECTRICAL ENGINEERING (POWER SYSTEM)
18-02-2014
SF6 GAS INSULATED TRANSFORMER
EMPLOYS SF6 GAS INSTEAD OF THE CONVENTIONAL OIL BOTH AS AN INSULATING AND COOLING AGENT.
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
CONTENTS
SF6 ---AN OVERVIEWGAS PROPERTIESAPPLICATIONS OF A GAS INSULATED
TRANSFORMER(GIT)FEATURES OF A GITLAYOUT COOLING APPARATUS OF A GAS
INSULATED TRANSFORMERDIFFERENCE BETWEEN OIT $ GITCONCLUSION
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
SF6 – AN OVERVIEW SF6 or sulfur hexafluoride gas molecules are
combined by one sulfur and six fluorine atoms
S + 3F2 = SF6 + 262 KCal.
Each sulphur atom in SF6 molecule creates covalent bond with 6 fluorine atoms.
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
SF6 GAS PROPERTIES
It is colourless, odourless, 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 eco-friendly and not poisonous. It can be recycled.
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
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.
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
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.
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
LAYOUT OF A GAS INSULATED TRANSFORMER
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
Oil immersed transformer
Gas insulated transformer
Insulation/cooling Insulating oil SF6 gas(Pressure 0.14 or 0.43MPa-g(20ˆ))
Solid Insulation Material
Oil Impregnated Paper, Pressboard
PET Film,PPS Film, Aramide Paper, Pressboard
Conservator Necessary Unnecessary
18-02-2014
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
Difference between oil immersed transformer and gas insulated transformer
Pressure rise on internal fault
Significant tank pressure increases do not occur during internal failures due to the Gas characteristics. The risk of a tank explosion or fire incident can be completely eliminated.
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
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.
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
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.
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014
REFERENCE
http://www.electrical4u.com/sulfur-hexafluoride-sf6-gas-properties/http://www.engineeringtoolbox.com/refrigerants-d_902.htmlhttps://www.toshiba.com/ind/data/tag_files/GIT_Brochure.pdf
18-02-2014
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
Thank you
NATIONAL INSTITUTE OF TECHNOLOGY PATNA
18-02-2014