Electrical Switching Device Arc Plate Inclined Area
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Solution Overview
Problem
Existing electrical switching devices suffer from excessive wear on contact materials due to prolonged arc presence between contacts, which leads to material burn-off, and the high cost of arc extinguishing devices.
Innovation Solution
The electrical switching device incorporates an arcing plate with an inclined area that increases the sum of separation distances as contacts open, allowing the arc to quickly jump to the arcing plate, reducing contact wear and utilizing a U-shaped arcing plate with wings for magnetic quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the separation distances S1 and S2 are reduced to encourage the arc to jump onto the arcing plate, then contact material wear is reduced, but the arc remains on the arcing plate for a longer time
Solution Approach 1:
The arcing plate is designed with an inclined area that changes the separation distance dynamically during the opening movement. As the first line part moves in the Y-direction, the inclined area causes the separation distance S2 to increase progressively, creating a time-varying geometric relationship that optimizes arc quenching at different stages of contact separation.
Solution Approach 2:
The invention changes the geometric parameter of the arcing plate by introducing an inclined area with a specific angle (25° to 35°) relative to the Y-direction. This parameter change ensures that the sum of separation distances S1 + S2 increases during opening, optimizing the arc path length and quenching efficiency while maintaining small initial separation distances.
2Reliability
If the arcing plate is designed with multiple components to improve arc quenching, then arc extinguishing effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The invention merges multiple arc quenching functions into a single integrated arcing plate component. The arcing plate combines the functions of providing separation distances, creating magnetic quenching paths through its inclined area, and supporting the arc during extinction, thereby eliminating the need for multiple separate arc extinguishing components and reducing manufacturing cost.
Solution Approach 2:
The arcing plate is designed as a multi-functional component that simultaneously performs arc capture, arc quenching, and magnetic field generation. The inclined area and wing structure enable the single component to achieve effective arc extinction while maintaining simple construction and low manufacturing cost.
3Force
If the line parts are arranged in opposite directions, then magnetic forces cancel each other out, but the arc stays longer on the contacts causing increased wear
Solution Approach 1:
The invention introduces asymmetry in the arrangement of line parts, with the first line part having a specific orientation and the second line part positioned differently. This asymmetric arrangement, combined with the inclined arcing plate, creates a magnetic field configuration that directs the arc toward the arcing plate more effectively, preventing prolonged contact arcing while maintaining magnetic force balance.
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 design minimizes contact material wear by rapidly extinguishing arcs and reduces the cost of arc extinguishing components through efficient arc diversion, thereby extending the lifespan of contact materials.
Implementation Method 1
In the event of a short circuit, the contacts are separated from one another. An arc forms between the contacts.
Implementation Method 2
The electrical switching device incorporates an arcing plate with an inclined area that increases the sum of separation distances as contacts open, allowing the arc to quickly jump to the arcing plate, reducing contact wear and utilizing a U-shaped arcing plate with wings for magnetic quenching.
Data Source
Figure 1a~1c
Figure 2~3
Figure 4~7
AI summary
The device has conducting parts (2, 3), each having a contact at its free end, and movable in a Y-direction relative to each other for separating the contacts lying close to each other in a closed condition. An arc plate (4) extends in the Y-direction and has separating distances (S1, S2). The plate has an area inclined to the Y-direction, where the sum of the distances is large when the contacts are disconnected from the closed condition.