Vacuum Interrupter Field Coupler for Balanced Dielectric Capacitance
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Solution Overview
Problem
Existing vacuum interrupter assemblies face challenges in maintaining favorable dielectric properties due to internal asymmetry and external influences from switchgear components, leading to electric field distortion and impaired dielectric performance.
Innovation Solution
The introduction of a field coupler made of electrically conductive material, which adds a field coupler capacitance to either the stationary contact-vapor shield capacitance or the moveable contact-vapor shield capacitance, ensuring that both capacitances are substantially equal, thereby counterbalancing field asymmetry and reducing electric field strength on the contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a vacuum interrupter is used in different kinds of switchgear, then the vacuum interrupter must adapt to different electrical environments, but the dielectric characteristics vary in different settings leading to unfavorable dielectric properties
Solution Approach 1:
The patent introduces a field coupler that can be dynamically adjusted or configured to compensate for electric field distortions in different switchgear environments. The field coupler's capacitance value can be selected or adjusted based on the specific electrical environment, allowing the vacuum interrupter to adapt its dielectric characteristics dynamically rather than being fixed during manufacturing.
Solution Approach 2:
The patent changes the electrical parameter (capacitance) by introducing a field coupler with specific capacitance values. This parameter change compensates for the varying dielectric characteristics in different switchgear configurations, allowing the same vacuum interrupter design to perform reliably across different electrical environments without requiring redesign or additional coatings.
2Volume of moving object
If miniaturization of components is demanded, then the vacuum interrupter size is reduced, but undesired distortion of the electric field occurs
Solution Approach 1:
The patent intentionally introduces asymmetry through the field coupler configuration to counterbalance the asymmetry caused by miniaturization. The field coupler is positioned and sized to create a deliberate asymmetric capacitance distribution that compensates for the electric field distortion resulting from the reduced vacuum interrupter dimensions, thereby restoring favorable dielectric properties.
3Reliability
If additional coatings are applied to the vapor shield, then the dielectric performance is improved, but the manufacturing process becomes cumbersome
Solution Approach 1:
The patent introduces a field coupler as an intermediary component that provides the necessary dielectric performance improvement without requiring direct modification of the vapor shield. Instead of applying additional coatings to the vapor shield, the field coupler acts as a separate element that couples the stationary contact to the vapor shield, achieving the desired electric field distribution while keeping the manufacturing process simple and avoiding cumbersome coating operations.
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 alleviates electric field distortion, enhances dielectric performance, and reduces the risk of dielectric breakdown by maintaining a stable vapor shield potential and minimizing capacitive coupling to ground.
Implementation Method 1
The field coupler is arranged and configured such that it adds a field coupler capacitance to at least one of the stationary contact-vapor shield capacitance and the moveable contact-vapor shield capacitance
Data Source
AI summary
Described herein is a VI assembly that includes a VI having a stationary contact on a stationary contact potential, a moveable contact on a moveable contact potential, and a vapor shield. The stationary and moveable contacts define a contacting area. The moveable contact is moveable relative to the stationary contact along an axis of the VI. The VI assembly further includes at least one field coupler. The stationary contact and the vapor shield have a predetermined stationary contact-vapor shield capacitance with respect to each other. The moveable contact and the vapor shield have a predetermined moveable contact-vapor shield capacitance with respect to each other. The field coupler is configured such that it adds a field coupler capacitance to at least one of the stationary contact-vapor shield capacitance and the moveable contact-vapor shield capacitance to make the stationary contact-vapor shield capacitance and the moveable contact-vapor shield capacitance substantially equal.