A gas insulated substation (GIS) is a high voltage substation in which the major structures are contained in a sealed environment with sulfur hexafluoride gas as the insulating medium. GIS technology originated in Japan, where there was a substantial need to develop technology to make substations as compact as possible. The clearance required for phase to phase and phase to ground for all equipment is much lower than that required in an air insulated substation; the total space required for a GIS is 10% of that needed for a conventional substation.
Gas insulated substations offer other advantages in addition to the reduced space requirements. Because the substation is enclosed in a building, a GIS is less sensitive to pollution, as well as salt, sand or large amounts of snow. Although the initial cost of building a GIS is higher than building an air insulated substation, the operation and maintenance costs of a GIS are less.
The primary applications for gas insulated substations include:
Beta has completed several noteworthy GIS projects in recent years. The Glendale substation was unique in both its architectural design and engineering challenges – incorporating an aesthetically pleasing substation into the Los Angeles area. Beta was also involved in the design and construction of a GIS substation in Anaheim, California that is completely hidden by a park.
Beta’s electrical engineering team designs and builds high voltage projects across the country, specializing in EPC services for gas insulated substations (GIS), switchyards and substations and high voltage transmission lines.
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