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|Mamoru Okabe||High Voltage Switchgear Design Dept., High Voltage Switchgear Business Div., Japan AE Power Systems Corporation|
|Akira Okada||International Substation Engineering Dept., Power & Industrial Systems,
|Hitoshi Yamada||High Voltage Switchgear Design Dept., High Voltage Switchgear Business Div., Japan AE Power Systems Corporation|
|Yuichiro Yamane||High Voltage Switchgear Design Dept., High Voltage Switchgear Business Div., Japan AE Power Systems Corporation|
To survive in the competitive electric industry, Hitachi needed to manufacture substation equipment efficiently by avoiding waste and developing more compact and reliable equipment. Toward this goal, Hitachi has standardized a new GIS (gas insulated switchgear) and serialized the standard GIS. The important design concept is a fully assembled bay transported directly from the factory. This design makes the equipment more reliable. The modular components, which reduce the number of parts, also have improved the reliability. For more compact components, a new smaller interrupter without a condenser between poles has been developed for CBs (circuit breakers) as a key component of GIS. Smaller DSs (disconnecting switches) were achieved by adopting the three-position DS of the blade and linear systems for a 168-kV or less GIS and for a 245-kV or larger GIS, respectively. Since the enclosures of main buses of all ratings are the three-phase common type, installation volume has definitely been decreased. The average installation volume as a whole is only 50% of the current GIS. A rational series of standard GIS could be brought about by using the same design concept for all rated-voltage classes and only two types of operation mechanisms for the CB; the motor-spring and hydraulic mechanisms.
|The Hitachi Hyoron (Japanese Only)|
GIS, CB, DS