Gas-insulated Circuit Breaker Research Articles

Protection of SF6 Gas Insulated Substations - Industry Survey Results

This paper summarizes the result of an industry survey of gas insulated equipment protection practices and develops recommendations where necessary. Tables are included to show the type of gas insulated equipment located at each substation (current transformers, voltage transformers, switches, bus bars, bushings, lightning arresters, and cable end terminations), the equipment configuration (single or three conductors), the type of gas monitoring equipment used (density or pressure), the use of gas monitoring equipment (alarm and/or trip), unique relaying protection applications, and unique operating procedures. Gas insulated circuit breakers are specifically excluded from this survey.

Gas-Insulated Switchgear and Interrupter

The historical progress of gas-insulated equipment in Japan is reviewed and the trend of technologies is discussed in the present paper. Since gas-insulated switchgear (GIS) and gas circuit breaker (GCB) have been widely applied to substation equipment, advanced technologies for high realiability and compactness of GIS are still required. Recent progress of analytical technologies, using digital computers, can meet their requirements. Technologies of gas insulation have contributed to the application of the equipment for the power transmission system and been attempted to advance GIS, such as ultra high voltage (UHV) GIS and HVDC GIS, with electronic diagnostic technologies.