To meet the increasing demand for electricity, distribution equipment capable of handling the highest voltages has to be erected in built-up areas. Such substations must meet a number of severe requirements, including small size, effective protection against atmospheric pollution, noiseless operation, nonflammability, reduced maintenance, and minimum radio interference. Conventional high-voltage substations using atmospheric air as the main dielectric cannot satisfy these requirements, but totally enclosed substations using sulphur hexafluoride (SF6) gas insulation can.
The design concept of the Gas-Insulated Substation (or GIS) has been developed by Mitsubishi Electric on the basis of many years' study of the application of SF6 as an insulating and interrupting medium. Since our first unit was shipped in 1965, more than 10000 SF6-gas circuit breakers have been replaced in service, both in Japan and abroad.
In 1968, an 84kV Mitsubishi GIS was placed in experimental service at an outdoor substation of the Kansai Electric Power Co. Since that time, we have been developing higher and higher voltages, and in 1970 a 550kV substation was completed.
In 1976, an even more advanced GIS was developed and placed in service. In this new development, the circuit breakers, disconnecting switches, grounding switches, lightning arresters, current and voltage transformers, and busbars for all three phases are installed in a common enclosure.
Products :
- Three-phase-enclosure type GIS (72.5kV-170kV)
- Single-phase-enclosure type GIS (72.5kV-300kV)
- Single-phase-enclosure type GIS (362kV-800kV)
For detailed information of the products, please contact :
Mitsubishi Electric (HK) Ltd
Address: 41/F, Manulife Tower, 169 Electric Road, North Point, Hong Kong Tel : (852)-2510-0555 Fax: (852)-2510-9830 (852)-2510-9822