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What is GIS Substation and how it operate? where these type
of substation installed?
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Answer Posted / sudheer
GIS means gas insulated substations.
SF6 Gas Insulated Substations (GIS) are preferred for
voltage ratings
of 72.5 kV, 145 kV, 300 kV and 420 kV and above. In such a
substation,
the various equipments like Circuit Breakers, Bus-Bars.
Isolators,
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 provides the phase to ground insulation. As the
dielectric strength
of SF6 gas is higher than 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
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What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side
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