High Voltage Sensing Capacitor with Incomplete Electrode Overlap
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Solution Overview
Problem
Existing high-voltage sensing devices are not suitable for busbars in switchgear and can experience partial discharge failures due to electrode and dielectric material exposure, leading to potential safety hazards and equipment damage.
Innovation Solution
A high-voltage sensing capacitor with electrodes having incomplete overlap and encapsulated within a dielectric insulator body, providing a high-impedance interface to deliver microampere-level currents for visual and audible alerts, while minimizing partial discharge risks through complete encapsulation and use of cycloaliphatic epoxy resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrodes and dielectric material are exposed to air in existing high-voltage interface apparatus, then the device structure is simpler and easier to manufacture, but corona and fringing occur which create partial discharge conditions leading to dielectric degradation and potential catastrophic failure
Solution Approach 1:
The patent applies encapsulation of electrodes and dielectric material within an insulator body, creating a protective shell that isolates the internal components from air exposure. This prevents corona discharge and partial discharge conditions while maintaining the functional integrity of the high-voltage interface apparatus.
2Reliability
If complete encapsulation of electrodes is implemented, then partial discharge is prevented and dielectric integrity is maintained, but device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent merges the electrodes, dielectric material, and insulator body into a single integrated encapsulated structure. This combination eliminates the need for separate assembly steps and reduces manufacturing complexity while ensuring complete encapsulation for reliable partial discharge prevention.
3Strength
If electrodes have incomplete overlap with physical separation, then partial discharge risk is reduced and dielectric strength is improved, but capacitive coupling efficiency decreases
Solution Approach 1:
The patent optimizes the parameters of electrode geometry, overlap area, and separation distance to achieve the desired balance between dielectric strength and capacitive coupling. By carefully controlling these parameters, the device maintains sufficient capacitive current generation for indicator operation while preventing partial discharge through adequate physical separation.
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 isolates the indicator unit from high-voltage sources, preventing catastrophic failures and ensuring safe operation by providing reliable visual and audible alerts for high-voltage conditions on busbars, while maintaining the integrity of the dielectric material.
Implementation Method 1
The sensing capacitor provides a very high impedance interface to the high-voltage bus, thereby delivering only microampere-level currents to an indicator unit
Implementation Method 2
an insulator body of a dielectric material substantially completely encapsulating the pair of electrical conductors and the physical separation therebetween
Data Source
AI summary
A high-voltage sensing capacitor as an interface apparatus that may be used to attach an indicator unit to a high-voltage AC electrical bus and to provide safety to maintenance personnel. The high-impedance nature of the sensing capacitor effectively isolates the indicator unit from the high-voltage source to which it is connected. Multiple electrical phases can be interfaced using a plurality of such sensing capacitors. The sensing capacitor can be directly mounted to a high-voltage busbar. The indicator unit may provide visual and/or audible alerts to maintenance personnel when high voltage conditions are detected on the busbar by the sensing capacitor. The sensing capacitor is comprised of a portable, unitary capacitive structure that includes a molded insulator body encapsulating two electrodes. The electrodes of the capacitor only partially or incompletely overlap within the insulator body. The electrode spacing and configuration is structured to provide a deliberate amount of coupling between the two electrodes in the presence of an AC electric field. Because of rules governing Abstracts, this Abstract should not be used to construe the claims in this patent application.