Vacuum Circuit Breaker Movable Electrode Connection Terminal
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Solution Overview
Problem
Conventional vacuum circuit breakers have high electrical and thermal resistance at connecting portions due to small contact areas between the movable-electrode-side connection-terminal and the flexible conductor, and between the movable-electrode-side connection-terminal and the movable electrode-rod, limiting their continuous current-carrying capacity and operation speed.
Innovation Solution
The design increases the contact area between the movable-electrode-side connection-terminal and the flexible conductor, and between the movable-electrode-side connection-terminal and the movable electrode-rod, by gripping the flexible conductor with multiple faces of the connection-terminal and applying high contact pressure, without enlarging the connection-terminal, thereby reducing electrical and thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact area between the movable-electrode-side connection-terminal and the flexible conductor is increased, then the electrical resistance and thermal resistance are reduced, but the movable-electrode-side connection-terminal becomes larger, resulting in increased mass and lowered operation speed
Solution Approach 1:
The connection-terminal is designed with multiple faces (first face, second face, and side face) that contact the flexible conductor at different locations and orientations. This multi-dimensional contact arrangement increases the total contact area without requiring an increase in the overall size or mass of the connection-terminal, thereby reducing electrical and thermal resistance while maintaining fast operation speed.
2Reliability
If the connection-terminal is made larger to increase contact area, then the electrical resistance and thermal resistance are reduced, but the mass increases and operation speed decreases
Solution Approach 1:
Instead of increasing the size of the connection-terminal, the invention utilizes multiple faces (first face, second face, and side face) to contact the flexible conductor. This multi-facial configuration distributes the contact area across different surfaces and orientations, achieving high current-carrying capacity without increasing the overall mass of the moving component.
3Reliability
If the connection between the movable-electrode-side connection-terminal and the movable electrode-rod is improved by increasing contact area, then thermal conductivity is enhanced, but the connection-terminal becomes more complex and larger
Solution Approach 1:
The connection-terminal employs multiple faces (first face contacting the flexible conductor, second face contacting the movable electrode-rod, and side face providing additional contact) to establish thermal conduction paths in different spatial dimensions. This multi-directional contact arrangement enhances thermal conductivity without requiring a complex or large-scale terminal structure.
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 enhances thermal conductivity, reduces heat generation, and increases the continuous current-carrying capacity of the vacuum circuit breaker without increasing the size of the connection-terminal, allowing for more efficient heat dissipation and improved operation speed.
Implementation Method 1
the electrical resistance and thermal resistance are reduced at connecting portions of the movable-electrode-side connection-terminal and the flexible conductor
Implementation Method 2
thermal conductivity is enhanced, reduces heat generation, and increases the continuous current-carrying capacity
Data Source
AI summary
An object is to provide a vacuum circuit breaker that has a lower electrical and thermal resistance at contacting portions between a movable electrode-rod and a movable-electrode-side connection-terminal so that a continuous current-carrying capacity is made larger without reinforcement and/or enhancement of an operating mechanism. The vacuum circuit breaker herein provided includes a vacuum interrupter held inside an insulation frame; a fixed electrode-rod mounted on one side of the vacuum interrupter; a movable electrode-rod mounted on the other side of the vacuum interrupter; a flexible conductor for electrically connecting the movable electrode-rod with a main-circuit conductor; and a movable-electrode-side connection-terminal fastened on the outer circumference of said movable electrode-rod; wherein the flexible conductor is gripped by a first face and a second face of the movable-electrode-side connection-terminal.