2. Index
⚫ Proposed Seminar Title
⚫ Literature Survey and Review
⚫ Block Diagram, construction &working principal in brief if applicable.(only overview
ont in detail)
⚫ Latest trends, case studies (if applicable) in the seminar topic only overview ont in detail)
⚫ Conclusion
⚫ References
3. Literature survey.
⚫ The gas insulated substations (GIS) are made up of a
set of equipment submerged in SF6 gas and a metal
enclosure in which all the equipment associated
with the substation is located.
⚫ The GIS are being widely used in the high voltage
electrical sector, due to this, developments and a
high degree of research corresponding to new trends
or emerging technologies that allow advances in this
equipment are being presented.
4. Working
⚫ Gas Insulated Substations (G.I.S)
⚫ Definition:A gas insulated substation (GIS) is a
substation that uses a superior dielectric gas, sulfur
hexafluoride (SF6),
⚫ high-voltage.The basic principle of gas-insulated
equipment:Is that the high-voltage current- carrying
parts are within a metal enclosure and are held in a
concentric configuration by cast epoxy spacer
insulators.
5. Need of GIS
⚫ Need for GISNon availability of sufficient
space.Difficult climatic and seismic conditions at
site.Urban site.Reduction in length of
feeders.Improvement of the quality of voltage
regulation due to short length feeder.
⚫ The total space required for GIS is 10% of the needed
of conventional substation.GIS technology can be
used for installation in areas where the real estates is
appreciable.
6. Future trends of GIS
Compact design of switch gear by using three phase
modules.Use vacuum circuit breaker cells in medium
high voltage GISOptimization GIS design to allow
easier maintenance.
Replacement of existing air insulated substation by GIS
will accelerate specially near Urban centers.
7. Conclusion
GIS – Necessary for extra HV and Ultra HV.Some
important areas to be studied include.More
conservative design.
Decomposition product management techniques.
Achieving & maintaining high levels of availability
require- more integrated approach to quality control
by both users and manufactures.
