U-Section Magnet Arrangement for Low-Voltage Circuit-Breaker Arc Control
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Solution Overview
Problem
Existing low-voltage circuit-breakers face challenges in improving the running characteristics of switching arcs during current interruptions, as known magnet arrangements are complex and difficult to adjust for optimal magnetic induction.
Innovation Solution
A magnet arrangement featuring a U-section metal sheet with a material recess containing a permanent magnet, which generates magnetic induction in the pre-chamber, allowing for adjustable and improved arc running characteristics by configuring the magnetic material and magnet placement for enhanced magnetic flux delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known magnet arrangements are used in pre-chambers, then magnetic induction can be delivered to improve switching arc characteristics, but the structure becomes complex and difficult to adjust for optimal magnetic induction
Solution Approach 1:
The magnet arrangement is segmented into a U-section magnetic circuit with separate pole pieces that can be independently positioned. The magnetic circuit is divided into distinct sections (first pole piece, second pole piece, and connecting section) allowing modular assembly and adjustment within the pre-chamber structure.
Solution Approach 2:
The magnet arrangement incorporates adjustable elements that allow the magnetic induction to be dynamically optimized. The pole pieces can be positioned at different distances from the arc running rails, and the strength of magnetic induction can be adjusted by changing the air gap between the pole pieces and the rails, enabling adaptation to different operating conditions.
2Reliability
If complex magnet arrangements are used to deliver magnetic flux, then switching arc running characteristics improve, but manufacturing and adjustment become difficult
Solution Approach 1:
The magnet arrangement merges the magnetic circuit components into a unified U-section structure where the first pole piece, second pole piece, and connecting section form an integrated assembly. This combining of elements simplifies manufacturing compared to assembling multiple separate magnetic components, while maintaining the ability to deliver effective magnetic flux to the pre-chamber.
3Reliability
If strong magnetic induction is applied to switching arcs, then arc running characteristics improve, but the magnet arrangement requires complex configuration and adjustment
Solution Approach 1:
The magnet arrangement is designed to generate the required magnetic induction automatically through its U-section configuration and permanent magnet integration. The structure self-adjusts to provide effective magnetic flux delivery to the switching arc during operation, reducing the need for complex external adjustment mechanisms while maintaining optimal arc running characteristics.
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 magnet arrangement simplifies the manufacturing and adjustment of magnetic induction, effectively improving the running characteristics of switching arcs in low-voltage circuit-breakers by providing a strong and adjustable magnetic flux, even during low arcing currents.
Implementation Method 1
at least one permanent magnet that delivers a magnetic flux to the magnetic circuit and generates magnetic induction in a vicinity of the pre-chamber that acts upon the switching arc
Implementation Method 2
generates magnetic induction in a vicinity of the pre-chamber that acts upon the switching arc
Implementation Method 3
The effective magnetic induction applied to the switching arc can be dictated by the geometry, the polarity, the constituent magnetic material and the magnetization of the permanent magnet
Data Source
AI summary
An exemplary magnet arrangement improves the running characteristics of a switching arc generated upon the interruption of a current circuit in a pre-chamber of a low-voltage circuit-breaker, in which the switching arc is directed between two electric arc running rails. The exemplary arrangement includes an open magnetic circuit having a magnetic material and at least one permanent magnet that delivers magnetic flux to the magnetic circuit, with magnetic induction generated in a vicinity of the pre-chamber acting upon the switching arc. The magnetic material can be configured as a U-section sheet metal plate which extends along the length of the pre-chamber and includes a material recess which extends through this pre-chamber metal sheet and is arranged to contain the at least one permanent magnet. The exemplary arrangement is of a simple construction and permits adjustment of magnetic induction acting in the pre-chamber of the low-voltage circuit-breaker.