Research of high current interruption process in SF6 gas insulated disconnecting switch

Abstract

This paper is connected with research of interruption processes in SF6 gas-insulated switchgear with increased breaking performance for rated 1600 A rated bus — transfer current switching test at different operating voltage levels. A special attention was derived to investigation of current breaking process duration at performed tests. The paper describes aspects of high current interruption with experimental results processing. The article presents switching performance estimations of 20 V and 100 V bus transfer voltage with mathematical prognostic functions in the form of approximation. AC volt-ampere characteristics are presented. Mathematical function of «Hot» rate of rise of dielectric strength of contact gap during arc quenching is presented. Different arc quenching technologies are described. Increasing of arcing time of examples with different grain size values is presented.