Insulating material housing for accommodating a vacuum interrupter tube

A detachable cap on the insulating housing for vacuum switching tubes enhances dielectric strength and current-carrying capacity by lengthening the arc path and preventing gaps, addressing the challenges of arcing and installation complexity in existing designs.

WO2026145984A1PCT designated stage Publication Date: 2026-07-09SIEMENS AG
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SIEMENS AG
Filing Date
2025-12-18
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Existing insulating housings for vacuum switching tubes face challenges in achieving high dielectric strength and current-carrying capacity while preventing arcing between adjacent switch poles and grounded metal parts, often requiring bulky modifications and complex installation.

Method used

A detachable cap made of insulating material, such as polycarbonate, is attached to the pole shell to close the opening, providing a longer arc path and enhancing dielectric properties without enlarging the pole shell, while allowing heat dissipation and preventing air gaps.

Benefits of technology

The cap design significantly increases dielectric strength and current-carrying capacity, simplifies installation, reduces the need for additional partitions, and maintains compact size, with improved arcing prevention and heat dissipation.

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Abstract

The invention relates to an insulating material housing (1) for accommodating a vacuum interrupter tube and a heat sink (4), wherein the insulating material housing (1) comprises a pole shell (10) having a cylindrical portion (11) which, in the installed state, is oriented in a vertical direction and comprises an upwardly facing opening (12) which is delimited by a circumferential rim (13) lying in a plane perpendicular to the vertical direction, wherein a heat sink (4) is arranged inside the pole shell (10) and has a heat-sink surface (5) which faces the opening (12) and is spaced apart from and parallel to the rim (13) of the opening (12). The insulating material housing (1) comprises a cap (14) which is made of an insulating material and which is detachably connectably mounted on the pole shell (10) for closing the opening (12), wherein the cap (14) comprises a base portion (15) extending in the vertical direction and a cover portion (16) extending substantially perpendicularly to the vertical direction, wherein a cap opening (17) is provided in the cover portion (16).
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