Gas Insulated Substations
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21-09-2008, 09:47 AM

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 the complete substation is reduced to about 10% of conventional air ? insulated substations. As a rule GIS are installed indoor. However outdoor GIS have also been installed earlier.

The various modules of GIS are factory assembled and are filled with SF6 gas at a pressure of about 3 Kg/ cm2. Thereafter they are taken to site for final assembly. Such substations are compact and can be installed conveniently on any floor of a multi - storied building or in an underground substation.As the units are factory assembled, the installation time is substantially reduced.

Such installation are preferred in cosmopolitan cities, industrial townships, etc. where cost of land is very high and higher cost of SF6 insulated switch gear (GIS) is justified by saving due to reduction in floor area requirement. They are also preferred in heavily polluted areas where dust, chemical fumes and salt layers can cause frequent flashovers in conventional outdoor air-insulated substations. The GIS has monitoring system.

The gas density in each compartment is monitored. If pressured drops slightly, the gas is automatically tapped up. With further gas leakage, the low-pressure alarm is sounded or automatic tripping or lock out occurs. By this method we can save the space required for the substation to build up. This means that gas-insulated substation can be built in any metropolitan city. Many experiments are going on the use of SF6 gas
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07-03-2012, 11:05 AM

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24-09-2012, 05:24 PM

Gas Insulated Substation

.doc   Gas Insulated Substationn1234.doc (Size: 54.5 KB / Downloads: 48)

Why we need GIS

1) Gas insulated Substations have found a broad range applications in power systems over the last three decades because of their high reliability Easy maintenance, small ground space requirements etc.,.
2) In our country also few GIS units have been in operation and a large number of units are under various stages of installation.
3) Although GIS has been in operation in several years, some of the problems are needful attention
4) These problems include VFTO during switching operations or earth faults and transient enclosure voltages and particle contamination.

Advantages of GIS:

a) Because of the entire equipment being enclosed in enclosures, filled with pressurized SF6 gas, installation is not subject to environmental pollutions, as experienced along coastal areas or certain types of industries.
b) Such installations are preferred in cosmopolitan cities, industrial townships, etc., where cost of land isveryhighand higher cost of SF6 insulated switchgear is justified by saving due to reduction in floor area requirement. It is not necessary that high voltage or extra high voltage switchgear to be installed out doors. c) Since most of the construction is modular and the assembly is done in the works, one site erection time both for supporting structures and switchgear is greatly reduced.


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