The Development Of Medium-voltage Gas-insulated Switchgear Up To 4000A

Medium voltage switchgear is the regional power supply system of electrical equipment.Its basic function is to control points,closing operation,and has the function of measurement and protection.Power supply system has to work continuously for a long time,the requirement of reliability is higher.Based on the existing medium voltage switchgear,on the basis of analyzing the composition and structure of our company,Some details about Medium-Voltage Gas-Insulated Switchgear up to 4000 A is introduced,and several key parts of the design process is presented.This paper describes the composition and selection principle of primary schemes of GIS(Gas Insulated Switchgear),and determines the general structure arrangement by comparing different elements and box structure,analyzes the insulating characteristics of SF6 gas and calculates the SF6 gas clearance and along surface insulation.It puts forward the factors that should be considered and strength analysis methods when designing gas chamber structure and analyzes the reasons of influencing the temperature rise of gas chamber and offers the ways of radiating.The vacuum circuit breaker and three position disconnector are designed for C-GIS and special micro-computer controller for the three-position disconnector is developed.On the basis of new type sensors,suitable control and protection system for C-GIS is suggested.The type test items for C-GIS and its internal elements are introduced.Our product has completed all the type tests,and all through the test.Now,our product has released to manufacturing.