Non-Linear Double-Motion Circuit Breaker With Lighter Contact Assembly
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Solution Overview
Problem
Existing high-voltage circuit breakers with non-linear double-motion mechanisms are energy-intensive, prone to mechanical failure due to numerous moving parts, and expensive due to the need for heavy components with silver coatings for conductivity and hardness.
Innovation Solution
A simplified non-linear double-motion circuit breaker design with a primary and secondary movable contact, where the secondary contact lacks a counter-contact, utilizing a linkage mechanism that reduces the mass of the secondary contact and employs a fixed dielectric shield to enhance dielectric resistance, allowing quicker and more reliable disconnection with reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy components with silver coatings are used to ensure conductivity and hardness, then reliability is improved, but manufacturing cost increases and device complexity increases
Solution Approach 1:
The patent removes the counter-contact component from the secondary movable contact assembly. This extraction eliminates the need for silver coating on this component, reducing manufacturing cost while maintaining reliability through the fixed dielectric shield design that provides sufficient electrical isolation and mechanical stability.
Solution Approach 2:
The patent replaces expensive silver-coated counter-contact components with simpler, less expensive materials. The fixed dielectric shield provides the necessary functional properties without requiring costly silver plating, achieving the same reliability outcome through a more economical material selection.
2Speed
If heavy components are used to ensure sufficient acceleration and speed for disconnection, then speed is improved, but energy consumption increases
Solution Approach 1:
By removing the counter-contact from the secondary movable contact, the patent reduces the moving mass that requires acceleration. This extraction allows the disconnection mechanism to achieve the same speed performance with lighter components, thereby reducing the energy required for actuation while maintaining the required disconnection speed.
3Adaptability or versatility
If numerous moving parts are used in the mechanism, then functionality is improved, but reliability deteriorates due to increased susceptibility to mechanical failure
Solution Approach 1:
The patent eliminates the counter-contact component and its associated moving parts from the secondary movable contact assembly. This reduction in the number of moving components decreases the complexity of the mechanism and reduces the points of potential mechanical failure, thereby improving reliability while maintaining the essential functionality through the simplified design.
4Adaptability or versatility
If counter-contact is used to engage the contact cylinder, then functionality is improved, but device complexity increases
Solution Approach 1:
The patent removes the counter-contact component from the secondary movable contact, thereby simplifying the device structure. The functionality previously provided by the counter-contact engagement is replaced or supplemented by the fixed dielectric shield design, achieving the same operational capability with fewer components and reduced structural complexity.
5Reliability
If silver coating is applied to contact cylinder and counter-contact cylinder, then conductivity is improved, but manufacturing cost increases
Solution Approach 1:
By removing the counter-contact component, the patent eliminates the need for silver coating on this part. The fixed dielectric shield design provides sufficient electrical properties without requiring expensive silver plating, thereby maintaining the necessary conductivity and hardness characteristics while significantly reducing manufacturing costs.
Data Source
AI summary
The invention concerns a double-motion circuit breaker comprising primary and secondary movable contacts slidingly mounted within primary and secondary holders, wherein the primary movable contact comprises a tulip and a contact cylinder attached thereto, and the secondary movable contact comprises a pin for engaging the tulip but no counter-contact for engaging the contact cylinder. The circuit breaker also has a non-linear linkage mechanism with a pin and slot mechanism, and a fixed dielectric shield provided on the secondary holder. During disconnection, the linkage mechanism is preferably arranged to move the pin more than the tulip, proportionally to their maximum stroke, so as to quickly bring the pin tip within the fixed dielectric shield, whereafter the tulip moves more than the pin. This circuit breaker is cheaper, lighter and can be disconnected more quickly.