Vacuum Interrupter Insulating Case Design
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Solution Overview
Problem
Vacuum interrupters face challenges in achieving adequate external dielectric strength, especially in harsh outdoor environments, due to limitations in existing encapsulation methods such as the use of polymers which are sensitive to pollution and ozone corrosion, and require cumbersome solutions like sealed enclosures with dielectric fluids.
Innovation Solution
The design extends the tubular insulating case to surround the metal caps, increasing the external insulating distance and using ceramic or glass-ceramic extensions with a filling resin to enhance dielectric performance, eliminating the need for additional encapsulation materials and maintaining the interrupter's compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer encapsulation is used to achieve external insulation, then dielectric performance is improved, but reliability deteriorates due to sensitivity to pollution and ozone corrosion
Solution Approach 1:
The invention changes the material parameter from polymer to ceramic/glass-ceramic, which fundamentally alters the chemical composition and structure to achieve resistance against pollution and ozone corrosion while maintaining dielectric performance
Solution Approach 2:
The invention uses composite construction by extending the ceramic insulating case to surround metal caps, creating a composite structure that combines the advantages of ceramic (corrosion resistance, dielectric strength) and metal (conductivity, mechanical strength) without using vulnerable polymer materials
2Reliability
If sealed enclosure with dielectric fluid is used to ensure external insulation, then dielectric strength is improved, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for separate sealed enclosures and dielectric fluids by integrating the insulating function directly into the extended ceramic insulating case structure, thereby simplifying the device while maintaining dielectric strength
Solution Approach 2:
The extended ceramic insulating case serves multiple functions simultaneously: it provides mechanical support, maintains vacuum seal, and delivers external insulation, eliminating the need for separate dedicated insulation components
3Reliability
If insulating distance is increased to improve external insulation, then dielectric performance is improved, but device dimensions increase
Solution Approach 1:
The invention extends the insulating case along the longitudinal dimension to surround the metal caps, effectively increasing the external insulating distance in a direction that does not significantly increase the overall device footprint, thus improving dielectric performance while maintaining compactness
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 solution enhances external dielectric performance without altering the interrupter's internal dimensions or requiring unreliable polymer encapsulations, ensuring durability in harsh conditions and extending the device's lifespan.
Implementation Method 1
The insulating case is extended on its outside part so as to surround and enclose the caps (51, 52)... increasing the external insulating distance and using ceramic or glass-ceramic extensions with a filling resin to enhance dielectric performance
Data Source
Figure 1a
Figure 1b~1c
Figure 2a~2b
AI summary
The present invention relates to a vacuum interrupter (1 ) comprising a tubular insulating case (3, 4) extending along a longitudinal axis (AA), two conducting caps (51, 52) each securely fixed at an open end of the tubular insulating case (3, 4) at a sealing area (7) to form a tightly sealed chamber (2). The vacuum interrupter is characterised in that the tubular insulating case (3, 4) is shaped so as to enclose the conducting caps (51, 52) and extend beyond said caps (51, 52) along its longitudinal axis (AA).