Study on the transverse burning action to contact shield during high-current vacuum interruptions in a solid insulated switchgear

Abstract

Solid insulated switchgear (SIS) has been accepted widely and became much small-size, nowadays. However, the miniaturization of SIS has restriction on the distance between the internal bus and the vacuum interrupter (VI). This will not only affect the electrical insulation and partial discharge characteristics of the SIS, but also will affect the current breaking capacity of the SIS. In order to improve the breaking capacity of a miniaturization SIS, the purpose of this paper is to study the transverse magnetic blowing action in a SIS, to calculate the electrodynamic force affected by pass bus conductor, and to simulate the magnetic field distribution between contact gaps generated by pass bus conductor. Lastly, a magnetic shielding solutions for the transverse magnetic blowing action is given, which has passed the test verification. The results showed that a magnetic shield in a vacuum interrupter is a powerful solution to solve the arc transverse blowing action to contact shield caused by the bus magnetic field in a SIS vacuum Interruption.