Vacuum switch tube

摘要

A vacuum switch tube has a housing which has two insulating housing regions arranged and configured symmetrically in respect of a center plane. Each of the two insulating housings contains a plurality of insulating housing parts. Shielding elements extend into the interior of the vacuum switch tube and are arranged between neighboring insulating housing parts and between insulating housing parts and neighboring additional housing parts. The shielding elements have improved dielectric properties and a simultaneously material-saving structure. Accordingly, the geometrical dimensions of the shielding elements are determined in dependence on a connected voltage and possible critical field strength between neighboring shields.

主权项

1. A vacuum interrupter, comprising:
a housing having two insulating housing regions formed and disposed symmetrically with respect to a central plane, each of said two insulating housing regions having a plurality of insulating housing parts and further housing part; shielding elements extending into an interior of the vacuum interrupter and disposed between respectively adjacent ones of said insulating housing parts and between said insulating housing parts and respectively adjacent ones of said further housing parts, said shielding elements having geometric dimensions determined depending on a voltage applied and a critical field strength between adjacent ones of said shielding elements, said shielding elements having bent ends, said geometric dimensions selected from the group consisting of a distance ds between ends of adjacent ones of said shielding elements, a distance S between a respective one of said shielding elements along an axial extent and one of said insulating housing parts and a radius of curvature R of said bent ends of said shielding elements; a contact system; and said shielding elements disposed adjacent said insulating housing parts disposed furthest removed from said contact system have the distance S from said insulating housing parts and the distance ds with respect to one another and at their ends having the radius of curvature R, where S, ds and R according toΔ⁢⁢Umaxds·[1+(dsɛr·s)2]·dsR3≤Ecritadhere to a maximum voltage difference ΔUmax at said furthest removed insulating housing part and the critical field strength, the critical field strength resulting from field computations of the vacuum interrupter, and the maximum voltage difference ΔUmax resulting fromΔ⁢⁢Umax=Δ⁢⁢U⁡(N)≈(3⁢N-2)-4⁢⁢α·(N-1)N2·Uwhere α: is a coupling factor being a measure of what proportions constitutes a voltage drop across said insulating housing parts closest to said contact system, andεr: is a dielectric constant of said insulating housing part depending on a number of said insulating housing parts.