Transformer innovators since 1945

Gas Insulated Switchgear (GIS)

Hyosung designs and manufactures a wide variety of SF6 Gas-Insulated-Switchgear (GIS) system to satisfy customers' specific substation requirements.

Hyosung believes in giving you the highest quality system at a reasonable price. Hyosung's units are currently installed in urbanized areas and built near industrial areas, including underground power substations in large commercial buildings, switchyards of power plants and new or expanding substations.


Hyosung prides itself on the ability to design and manufacture GIS that is 100% compatible with your exact specifications. Hyosung designs and constructs a wide variety of high voltage SF6 GIS ranging from 28.5kV units to 800kV units, with short ciruit ratings up to 63kA. All of Hyosung's equipments comply with IEC, ANSI, IEEE and other international standards and it has shipped to customers all over the world.

Special features
- High reliability
Features enhanced insulating properties and reduced long term operational costs by means of sealed metal enclosure filled with SF6 gas assuring first-rate reliability.

- Compact design
Possesses extensive experience in designing optimum phase and feeder spacing dimensions according to site conditions. This results in compact dimensions that reduce space requirements to less than 20% of conventional air insulated substations.

- Safety
Ensures personnel safety by earthed enclosure, numerous interlocks and lockout devices and provides greater stability during earth quakes with a lower center of gravity.

- Elimination of periodic maintenance
Virtually eliminates long-term maintenance costs and contamination of critical components by means of SF6 gas-filled metal enclosures, automatic monitoring of operating mechanisms and SF6 gas system.

- Efficient installation
Reduces installation time and costs since assembly is performed in the factory and shipped in one complete bay.

- Environmental compatibility
Minimizes operation noise to make it advantageous for urban and suburban indoor substations. Also eliminates radio interference problems.

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