Ceramic Insulator Discharge Path Breakers for Vacuum Interrupters
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Solution Overview
Problem
Vacuum interrupters face challenges in achieving high dielectric strength, particularly at high voltages, due to discharge build-up along ceramic insulators, which limits their technical and economic feasibility, and the use of segmented insulation with metal structures increases costs and mechanical complexity.
Innovation Solution
A ceramic insulator with a cavity and electrically conductive discharge path breakers, such as metal or metal-oxide mixtures, is designed to enhance dielectric strength by interrupting discharge paths, featuring a closed ring structure perpendicular to the insulator's longitudinal extent, with optimized metallization for improved electrical and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulator length is increased to achieve high dielectric strength, then the dielectric strength improves, but the cost and mass increase significantly
Solution Approach 1:
The insulator surface is segmented into multiple sections by discharge path breakers arranged in series along the insulator. These breakers divide the continuous discharge path into multiple shorter segments, allowing the insulator to achieve high dielectric strength at 100 kV and above without requiring excessive length, thereby reducing material costs and manufacturing complexity while maintaining reliable electrical insulation performance
2Reliability
If the insulator length is increased to achieve high dielectric strength, then the dielectric strength improves, but the device complexity increases
Solution Approach 1:
Rather than uniformly increasing the entire insulator length, the invention applies discharge path breakers at specific critical locations along the insulator surface where discharge is most likely to occur. This localized approach effectively interrupts discharge paths and enhances dielectric strength without requiring a proportionally longer insulator, thereby avoiding excessive structural complexity while achieving the desired electrical performance
3Reliability
If segmented insulation with metal structures is used to interrupt discharge paths, then the dielectric strength improves, but the production cost increases
Solution Approach 1:
The discharge path breakers are integrated directly into the ceramic insulator body as a unified component rather than being separate metal structures attached to the insulator. This merging of the discharge path breakers with the insulator material simplifies the manufacturing process, reduces the number of assembly steps, and lowers production costs while maintaining the effectiveness of discharge path interruption and the required dielectric strength
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly increases dielectric strength, reduces production costs, and simplifies mechanical design by effectively interrupting discharge paths within the vacuum interrupter, enabling higher voltage applications with reduced material and energy requirements.
Implementation Method 1
the discharge structure is dominated by the desorption of adsorbed gas layers by field-emitted electrons
Implementation Method 2
a plurality of electrically conductive discharge path breakers extending perpendicularly to the longitudinal extent of the ceramic insulator
Implementation Method 3
the discharge structure is dominated by the desorption of adsorbed gas layers by field-emitted electrons
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a ceramic insulator (10) for vacuum interrupters (1), the ceramic insulator (10) extending along a longitudinal extent (20) and forming a cavity (15) in said longitudinal extent (20). The cavity (15) comprises a first opening (31) on a first end (30) of the longitudinal extent (20) and a second opening (33) on a second end (32) of the longitudinal extent (20), a second opening (33). The openings are designed so that they can be sealed in a gas-tight manner using appropriate connecting means (40). The sealed first opening (35) is designed to guide at least one fixed contact (38) into the cavity (15), and the sealed second opening (37) is designed to guide at least one moving contact (37) into the cavity (15). The ceramic insulator (10) comprises, on an inner face of the cavity (15), one or multiple electrically conductive discharge path interrupters (12) extending perpendicularly to the longitudinal extent (20) of the ceramic insulator (10).