Capacitive Voltage Sensor Assembly with Porous Shield
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Solution Overview
Problem
Existing capacitive voltage sensors suffer from issues such as air bubbles in the dielectric resin leading to partial discharges, resin detachment, and poor adhesion to sensor components, especially under varying temperature conditions, which affect their accuracy and reliability.
Innovation Solution
A capacitive voltage sensor assembly featuring a tubular shield with through holes and a circular sensor element with conductive and insulating layers, where the dielectric material fills the holes and gaps, ensuring secure adhesion and preventing unwanted discharges by forming a monolithic structure and using a mass of dielectric material to insulate and secure the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dielectric resin is used to surround sensor components, then electrical insulation is provided, but air bubbles form causing unwanted partial discharges
Solution Approach 1:
The tubular shield incorporates a plurality of through-holes that allow the dielectric resin to penetrate and impregnate the entire sensor assembly. This porous structure enables complete resin saturation, eliminating air bubbles while maintaining electrical insulation properties.
Solution Approach 2:
The tubular shield acts as an intermediary structure between the electrode and the dielectric resin. It guides the resin flow through its through-holes and ensures uniform distribution, preventing air bubble formation during the impregnation process.
2Reliability
If dielectric resin is used for insulation, then electrical isolation is achieved, but resin detaches from sensor elements causing partial discharges
Solution Approach 1:
The tubular shield serves as an intermediary structure that facilitates uniform resin distribution and ensures intimate contact between the resin and sensor elements. This intermediate structure prevents resin detachment by maintaining consistent adhesion across all surfaces.
Solution Approach 2:
The sensor assembly is designed with through-holes in the tubular shield before the resin impregnation process. This preliminary structural arrangement ensures that the resin can penetrate and bond to all surfaces uniformly, preventing future detachment issues.
3Strength
If dielectric resin is used to constrain sensor organs, then structural support is provided, but poor adhesion leads to discontinuities under temperature cycling
Solution Approach 1:
The tubular shield with through-holes creates a porous structure that allows complete resin penetration. This ensures the resin bonds to all sensor components uniformly, maintaining adhesion continuity even under thermal expansion and contraction during temperature cycling.
Solution Approach 2:
The resin impregnation process ensures that each local region of the sensor assembly receives adequate resin saturation through the tubular shield's through-holes. This localized quality control prevents adhesion discontinuities that would otherwise occur during temperature variations.
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 effectively prevents partial discharges and ensures reliable operation by eliminating air bubbles and ensuring secure adhesion of the sensor components, even under temperature variations, thereby enhancing the accuracy and longevity of the capacitive voltage sensor.
Implementation Method 1
a capacitive sensor which detects the electric field generated by a voltage element of the same capacitive sensor
Implementation Method 2
a mass of dielectric insulating material surrounding the tubular shield and the circular sensor element
Data Source
AI summary
A capacitive voltage sensor assembly includes an electrode extending along a longitudinal axis, the electrode having a first end and a second end opposite the first end, and a tubular shield surrounding and spaced radially outward from a portion of the electrode. The tubular shield includes a plurality of through holes. The sensor assembly also includes a circular sensor element positioned radially inward of the tubular shield and including a first layer made of electrically conductive material and a second layer made of electrically insulating material. The circular sensor element includes a plurality of circumferentially spaced gaps.