Breaker Conductor Thin-Section Cutting to Limit Arc Spread
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Solution Overview
Problem
The increasing current-carrying capacity of breaker devices in electric vehicles and machine tools leads to larger conductors, which, when split or cut, easily generate and spread electric arcs, causing failure and damage during electrical interruption.
Innovation Solution
A breaker device design featuring a conductor with a thin portion connected to a partition portion and a thicker portion, where the cutting occurs at a smaller cross-sectional area, reducing the electric arc generation area, and incorporating a pusher with specific geometries to minimize arc spread and prevent holder damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the conductor has a large cross-sectional area to ensure sufficient current-carrying capacity, then the current-carrying capacity is improved, but the conductor easily causes electric arc spread when cut
Solution Approach 1:
The conductor is divided into multiple sections with different cross-sectional areas. The thin portion (Smaller area) is positioned at the cutting location to reduce arc generation, while the thick portion (larger area) maintains overall current-carrying capacity. This segmentation allows the conductor to satisfy both high current capacity requirements and safe cutting characteristics.
Solution Approach 2:
Different portions of the conductor are given different cross-sectional areas tailored to their specific functions. The thin portion at the cutting zone is optimized for arc suppression, while the thick portion in the current-carrying zone is optimized for electrical capacity. This local differentiation resolves the contradiction between overall capacity and local safety.
2Quantity of substance
If the conductor is cut at a large cross-sectional area, then the current-carrying capacity is maintained, but the electric arc generation area increases
Solution Approach 1:
The conductor cross-section is segmented into a thin portion and a thick portion. The thin portion is specifically positioned at the cutting location to minimize arc generation area, while the thick portion maintains the overall current-carrying capacity of the conductor assembly.
Solution Approach 2:
The conductor design transitions from a uniform cross-section to a variable cross-section along its length. By changing the cross-sectional dimension at different locations (thin at cutting zone, thick at current-carrying zone), the design simultaneously achieves small arc generation area and high current capacity.
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 design effectively reduces the spread of electric arcs and minimizes damage to the breaker device by cutting at a smaller cross-sectional area and directing the arc through paths that allow for efficient cooling and containment, enhancing the device's operational reliability.
Implementation Method 1
a drive source configured to move the pusher from the first internal space toward the second internal space
Implementation Method 2
When split or cut, a conductor having a large cross-sectional area easily causes an electric arc. The electric arc is likely to spread from a cut section of the conductor as a starting point.
Data Source
AI summary
This breaker device includes: a holder including a first internal space and a second internal space located below the first internal space; a conductor located between the first internal space and the second internal space and held on the holder; a pusher disposed in the first internal space; and a drive source that moves the pusher from the first internal space toward the second internal space. The conductor includes: a first embedded portion held on the holder; a second embedded portion held on the holder; and a partition portion disposed between the first embedded portion and the second embedded portion. The pusher is located above the partition portion. The first embedded portion includes: a thin portion connected to the partition portion; and a thick portion located opposite the partition portion across the thin portion. The thickness of the thick portion in the up-down direction is greater than the thickness of the thin portion in the up-down direction.