Arc-Breaking Plates With Ferromagnetic And Non-Ferromagnetic Zones
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Solution Overview
Problem
Existing switching apparatuses for electric power distribution grids face inefficiencies in arc quenching due to electromagnetic forces causing electric arc segments to bridge on top and sides of arc-breaking plates during opening maneuvers, reducing the effectiveness of the quenching action.
Innovation Solution
The apparatus incorporates arc-breaking plates with a ferromagnetic and non-ferromagnetic material combination, where the ferromagnetic portion is positioned proximal to the movable contact and the non-ferromagnetic portion is distal, creating a configuration that prevents arc segments from bridging by confining them within the ferromagnetic region, enhancing the quenching action and manufacturing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If arc-breaking plates are made of ferromagnetic material to enhance arc quenching, then arc segmentation is improved, but electromagnetic forces cause arc segments to bridge on top and sides of the plates
Solution Approach 1:
The arc-breaking plate is divided into two distinct regions: a ferromagnetic region (proximal to movable contact) and a non-ferromagnetic region (distal to movable contact). This local differentiation allows the ferromagnetic region to provide strong arc segmentation while the non-ferromagnetic region prevents harmful electromagnetic forces from causing arc bridging on the top and sides of the plate.
Solution Approach 2:
The arc-breaking plate combines ferromagnetic and non-ferromagnetic materials in a single composite structure. The ferromagnetic portion provides effective arc quenching through magnetic field interaction, while the non-ferromagnetic portion acts as a barrier to prevent arc segments from bridging, thus resolving the contradiction between quenching effectiveness and arc control.
2Reliability
If arc-breaking plates use complex multi-material construction to prevent arc bridging, then arc quenching performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention uses a composite structure combining ferromagnetic and non-ferromagnetic materials in a single arc-breaking plate. This composite approach achieves superior arc quenching performance while maintaining manufacturing feasibility through established metallurgical techniques for creating bimetallic or composite plates.
Solution Approach 2:
The arc-breaking plate is segmented into two functional regions (ferromagnetic and non-ferromagnetic) that can be manufactured separately and then joined together using conventional metallurgical processes, thereby achieving complex functionality without excessive manufacturing difficulty.
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 effectively prevents or reduces arc bridging, improves commutation efficiency, and allows for easy and cost-effective manufacturing, ensuring effective arc quenching and dielectric gas cooling, thus enhancing the overall performance of the switching apparatus.
Implementation Method 1
Such a phenomenon, which is mainly due to the electromagnetic forces generated by the currents circulating along the arc-breaking plates, often causes the bridging of the electric arc segments on the top and along the sides of the arc-breaking plates
Implementation Method 2
the arc-breaking plates comprise a first portion made of a ferromagnetic material and a second portion made of a metallic non-ferromagnetic material
Data Source
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AI summary
A switching apparatus for electric power distribution grids comprising: - one or more electric poles; - for each electric pole, at least a fixed contact and a movable contact. The movable contact is reversibly movable between a coupled position, at which said movable contact is coupled with said fixed contact, and an uncoupled position, at which said movable contact is separated from said fixed contact; - for each electric pole, an arc-breaking assembly comprising an arc-chute arrangement including a plurality of arc-breaking plates. Said arc-breaking plates are electrically disconnected from said fixed contact, said movable contact and other live parts of said electric pole, so that they normally are at a floating voltage potential. The arc-breaking plates comprise a first portion made of a ferromagnetic material and a second portion made of a non-ferromagnetic material.