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 the 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 advanta ges in addition to the reduced space requirements. Because the substation is nclosed 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.v

Space-saving compact and modular type GIS has been possibly developed through our most optimal constructional,
dielectrical design based on our internationally recognized high technology and engineering. Under such a design
concepts, LSIS’s GIS is just right for the customers who have only limited area for substations or inside the densely
populated cities. 

Since the main parts of switchgear and SF6 Gas are completely sealed in metal enclosure, GIS is less affected from
environmental pollution, climatic changes and dielectric deterioration in consequence of time operation than previous
conventional type.

Compact design makes it convenient to deliver GIS to the site. The installation period is shortened because it is easy
enough to connect each modules for completion of installation. Easy extension work can be performed without any
interruption of electric power by adopting modular design. All of repair works and inspections are being on the ground
level. It is possible to maintain and repair during live condition of GIS as main parts of GIS are tightly encapsulated with
SF6 gas without any influence of ambient environment. Especially, LSIS GIS adopts the hydraulic operating method, it
is not necessary to do periodic inspections as air compressor type does. LSIS GIS has been developed toward the
design concept for man free, repair free and maintenance free.

Through ERP (Enterprise Resource Planning) program and Quality System(ISO 9001), LSIS strictly control the quality
of GIS and maintain best delivery service to the customers. LSIS adopts procedures for production, delivery and
technical service which are fully environment-friendly under control of ISO 14001 for our future generation.