Triple Point Interface Angle for High Voltage Field Control
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Solution Overview
Problem
Existing electric field control devices for high voltage components are damaged at the triple point where the insulating, semi-conducting, and resistive layers meet, limiting their use to specific voltage levels.
Innovation Solution
Designing the interface between the resistive and insulating layers to make an angle of 60°-120°, preferably 70°-110°, at the triple point to extend equipotential lines and reduce material usage, with manufacturing methods such as grinding or recesses to achieve this angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the interface angle between resistive and insulating layers at the triple point is not optimized (conventional design), then the device can be manufactured with simpler processes, but the device will be damaged at higher voltages due to stress concentration at the triple point
Solution Approach 1:
The patent changes the geometric parameter of the interface angle between the resistive and insulating layers at the triple point from conventional values to a specific range (60°-120°). This parameter change redistributes the electric field and reduces stress concentration, enabling the device to withstand higher voltages without damage.
Solution Approach 2:
The patent addresses a two-dimensional stress distribution problem by introducing a specific angular geometry in the cross-sectional view of the triple point. By controlling the interface angle between layers in this cross-section, the patent transforms the stress distribution pattern, preventing concentration at the triple point and improving voltage withstanding capability.
2Strength
If more resistive layer material is used to increase voltage handling capability, then the device can withstand higher voltages, but the cost increases significantly due to expensive field controlling material
Solution Approach 1:
By optimizing the interface angle parameter at the triple point, the patent improves voltage distribution and reduces stress concentration. This allows the device to achieve higher voltage withstanding capability with less resistive layer material, directly reducing the quantity of expensive field controlling material required.
Solution Approach 2:
The patent applies a specific interface angle configuration locally at the triple point region, where stress concentration occurs. This localized geometric optimization efficiently manages the electric field and stress distribution at the critical triple point, maximizing voltage handling capability while minimizing the overall amount of resistive layer material needed in the entire device.
3Strength
If the interface angle at the triple point is optimized to 60°-120°, then voltage withstanding capability increases, but the manufacturing precision requirements increase to achieve and maintain this specific angle
Solution Approach 1:
The patent specifies an angle range (60°-120°) rather than a single precise value, which maintains the beneficial effect of stress reduction while providing manufacturing tolerance. This parameter specification balances performance optimization with practical manufacturability.
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
Enables the device to handle higher voltages without damage, reducing material costs and preventing stress on high voltage components like cable joints and terminations.
Implementation Method 1
The electric potential between the live part and ground is distributed by means of a material with a suitable resistance forming said resistive layer
Implementation Method 2
said angle of said interface strongly influences the behaviour of the materials in said triple point, and that considerably higher voltages may be taken by these materials without damaging the device in this region by selecting said angle within said interval thanks to the advantageous extension of the equipotential lines
Data Source
AI summary
A device for controlling an electric field at a high voltage component including a resistive layer for field control, an insulating layer arranged on the resistive layer and a semi-conducting or conducting layer arranged on the insulating layer. The three layers meet at a triple point where the insulating layer ends. An interface between the resistive layer and the insulating layer makes in the triple point an angle to the semi-conducting or conducting layer of 60°-120°.