High-Voltage Feed-Through Capacitor Insulation for Dielectric Breakdown
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Solution Overview
Problem
High-voltage feed-through capacitors face reliability issues due to dielectric breakdown caused by high inter-conductor electric field intensity, which is influenced by the electrical resistivity of the tube and second resin, and is not adequately addressed in existing configurations.
Innovation Solution
The configuration includes a tube with electrical resistivity equal to or greater than that of the second resin, reducing the inter-conductor electric field intensity and enhancing reliability by preventing dielectric breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation structures are used with arbitrary electrical resistivity values, then manufacturing is simplified, but dielectric breakdown occurs due to high inter-conductor electric field intensity
Solution Approach 1:
The patent applies parameter changes by specifying precise electrical resistivity ranges for the tube (10^7 to 10^14 Ω·m) and second resin (10^8 to 10^15 Ω·m) materials. This controlled parameter adjustment optimizes the electric field distribution between the through-conductor and second electrode, reducing inter-conductor electric field intensity to below 10^7 V/m and preventing dielectric breakdown while maintaining manufacturing feasibility.
2Reliability
If the tube and second resin have high electrical resistivity, then inter-conductor electric field intensity decreases and dielectric breakdown is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific electrical resistivity ranges for the tube and second resin materials rather than requiring exact values. This approach balances reliability improvement through high resistivity (preventing dielectric breakdown) with manufacturing feasibility by allowing tolerances within the specified ranges, thus reducing the stringency of manufacturing precision requirements.
Solution Approach 2:
The patent employs composite material selection by specifying that the tube and second resin be made from materials with high electrical resistivity properties. This material selection strategy achieves the dual goal of reducing electric field intensity (improving reliability) while working within practical manufacturing capabilities through appropriate material choice rather than demanding extreme precision in fabrication.
3Ease of manufacture
If the tube has lower electrical resistivity than the second resin, then manufacturing is easier, but electric field concentration occurs leading to dielectric breakdown
Solution Approach 1:
The patent establishes a critical parameter relationship where both the tube and second resin must have high electrical resistivity, with the second resin's resistivity being equal to or greater than the tube's. This parameter configuration prevents electric field concentration at the tube-second resin interface, eliminating the harmful effect of dielectric breakdown while remaining compatible with standard manufacturing processes.
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
This configuration effectively decreases the inter-conductor electric field intensity, thereby improving the reliability of high-voltage feed-through capacitors by preventing dielectric breakdown and ensuring stable operation.
Implementation Method 1
The tube has an electrical resistivity equal to or greater than an electrical resistivity of the second resin
Implementation Method 2
An intensity of an electric field that is formed between the second electrode and the through-conductor has an influence on reliability
Data Source
AI summary
An element body is formed with a through hole to be open at the first main surface and the second main surface opposing each other. A through-conductor includes a first portion located inside the through-hole and a second portion protruding from the second main surface. A case surrounds the element body and is electrically insulating. A cover surrounds the second portion and is electrically insulating. A tube covers the first portion and is electrically insulating. A resin is contained in the cover and is located in a space between an inner surface of the element body and the tube. The tube has an electrical resistivity equal to or greater than an electrical resistivity of the resin.