Arc Chamber Composite Plates for Low-Voltage Circuit Breakers
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Solution Overview
Problem
Low voltage circuit breakers face challenges in withstanding thermal and mechanical stresses during electrical arcs, leading to damage and the need for frequent replacement of arc-breaking metal plates, with existing solutions failing to adequately insulate and prevent arc escape.
Innovation Solution
Incorporating arc-breaking plates made of a combination of ferromagnetic and ceramic materials, where the peripheral region is ferromagnetic and the central region is ceramic, to enhance insulation and thermal resistance, reducing ablation and melting of plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If ferromagnetic material is used for arc-breaking plates, then magnetic blowing effect is improved, but thermal resistance and insulation are insufficient causing plate melting and damage
Solution Approach 1:
The arc-breaking plate is constructed as a composite structure with a ferromagnetic substrate providing magnetic blowing effect and a ceramic coating layer providing thermal resistance and insulation. This composite material approach allows simultaneous achievement of strong magnetic field interaction and high temperature withstand capability, resolving the contradiction between magnetic effect and thermal resistance.
2Reliability
If traditional metal plates are used in arc chamber, then magnetic and electrical performance is maintained, but ablation and melting occur under high thermal stress
Solution Approach 1:
The combination of ferromagnetic material and ceramic coating creates a composite plate that maintains the magnetic properties needed for arc control while the ceramic layer provides exceptional resistance to ablation and melting under high thermal stress, significantly improving reliability.
Solution Approach 2:
The ceramic coating is applied specifically to the surfaces directly exposed to the arc, providing localized thermal protection where it is most needed, while the ferromagnetic substrate maintains the overall magnetic field generation capability.
3Speed
If arc chamber design is optimized for rapid interruption, then opening speed is improved, but thermal and mechanical stresses increase causing damage to components
Solution Approach 1:
The ceramic-coated ferromagnetic plates can withstand the intensified thermal and mechanical stresses resulting from rapid opening operations, as the ceramic layer protects against thermal shock and mechanical wear while allowing fast operation to be maintained.
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 use of ceramic and ferromagnetic materials in the arc chamber effectively withstands electrical and magnetic effects, reduces plate damage, and maintains insulation, minimizing the need for maintenance and plate replacements while maintaining magnetic and electrical performance.
Implementation Method 1
arc-breaking plates made of a combination of ferromagnetic and ceramic materials, where the peripheral region is ferromagnetic and the central region is ceramic
Implementation Method 2
enhance insulation and thermal resistance, reducing ablation and melting of plates
Implementation Method 3
The very high temperatures that develop during arching phenomena can lead to melting and damages of the arc-breaking metal plates arranged in the chamber
Implementation Method 4
The very high temperatures that develop during arching phenomena can lead to melting and damages of the arc-breaking metal plates arranged in the chamber
Implementation Method 5
During arc forming, the energy released by Joule effect is very high and causes thermal and mechanical stresses inside the plate containment region
Data Source
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AI summary
A low-voltage circuit breaker comprising one or more electrical poles, each of said poles having an internal space with a contact area and an arc extinguishing area, a fixed contact assembly and a movable contact assembly being positioned in said contact area, said movable contact assembly being movable between a closed position in which it is into contact with said fixed contact assembly and an open position in which it is spaced apart from said fixed contact assembly, an arc chamber comprising a plurality of substantially parallel arc-breaking plates made of a ferromagnetic material being positioned in said arc extinguishing area. The low-voltage circuit breaker is characterized in that said arc chamber further comprises at least one arc-breaking plate which is at least partially made of a ceramic material.