Gas Insulated Substation (GIS)

Gas Insulated Substation (GIS) is a compact, multi component assembly enclosed in a ground metallic housing which the primary insulating medium is compressed sulphurhexaflouride(SF6) gas. It generally consists components of

a) Bus bars
b) Circuit Breakers
c) Disconnecting switches
d) Earthing switches
e) Current transformers
f) Voltage transformers
g) Cable and boxes
h) Gas supply and gas monitoring equipment
j) Local co..............etc

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GAS INSULATED SUBSTATION

INTRODUCTION
Conventional substations requires, small installation size, protection against atmospheric pollution and moisture, noiseless operation, nonexplosive and flame resistant, reduced maintenance, minimal radio interference, but totally enclosed substations using SF6 gas as insulation that are also known as GIS is now in widespread use in the electrical power industry .
It consist of
¢ Bus bars
¢ Circuit breakers
¢ Disconnecting switches
¢ Earthing switch..............etc

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GAS INSULATED TRANSFORMER
SF6 GAS INSULATED TRANSFORMER
EMPLOYS SF6 GAS INSTEAD OF THE CONVENTIONAL OIL BOTH AS AN INSULATING AND COOLING AGENT
SF6 – AN OVERVIEW
 SF6 is Sulphur hexafluoride formed by chemical reaction of molten sulphur and fluorine.
 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 not ..............etc

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INTRODUCTION
Composed of pipes that houses conductors in SF6
Invented in 1974
Both overhead & underground system
Drawbacks of XLPE lead to GIL
Most economic, environment friendly & maintenance free alternative



WHY GIL
Installation expense is less
XLPE needs extra cooling arrangement
Allowe..............etc

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SF6 Gas insulated Substations (GIS) are preferred for voltage ratings of 72.5KV, 145KV, 245KV, 420KV and above. In such a situation, the various equipments like circuit breakers, busbars, isolators, and load break switches; current transformers, voltage transformers, earthing switches etc. are housed in metal enclosed modules filled with SF6 gas.

The SF6 gas provides the phase to ground insulation. As the dielectric strength of SF6 gas is higher than the air, the clearances required are smaller. Hence, the overall size of each equipment and..............etc

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