Leakage Test Contact Layout in Compact Circuit Breakers
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Solution Overview
Problem
Existing circuit breakers with leakage protection face safety hazards and structural challenges due to the need for a leakage testing loop that increases volume and affects performance when miniaturized, and existing testing devices have different constructions and layouts.
Innovation Solution
A circuit breaker design with a leakage testing mechanism featuring two contact points, a first test contact point that closes with a testing button and a second test contact point that remains closed when the circuit breaker is closed, utilizing elastic members and an intermediate connecting member to ensure safety and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circuit breaker uses a traditional arc quenching mechanism with multiple arc quenching chambers and movable contacts, then it can achieve reliable circuit breaking, but the device complexity increases and the response time is delayed
Solution Approach 1:
The patent extracts and eliminates the movable contact component from the traditional circuit breaker structure. By using a fixed contactless arc quenching mechanism, the design removes unnecessary moving parts while maintaining reliable circuit breaking functionality through the arc quenching chambers alone.
Solution Approach 2:
The patent divides the arc quenching mechanism into multiple independent arc quenching chambers (first, second, and third chambers). Each chamber handles specific arc quenching tasks, allowing the system to achieve reliable circuit breaking through distributed, modular arc management rather than a single complex mechanism.
2Reliability
If a circuit breaker uses a traditional arc quenching mechanism with movable contacts, then it can achieve circuit breaking function, but the response time increases due to mechanical movement delays
Solution Approach 1:
The patent removes the movable contact that causes mechanical movement delays. The contactless arc quenching mechanism responds immediately to overcurrent conditions without the inertia and mechanical transition delays inherent in traditional movable contact systems.
Solution Approach 2:
The patent replaces the mechanical movable contact system with an electromagnetic or field-based contactless arc quenching mechanism. This substitution eliminates mechanical movement entirely, allowing for faster response times while maintaining the circuit breaking function through controlled arc extinction in the quenching chambers.
3Speed
If a circuit breaker uses a fixed contactless arc quenching mechanism, then the response time is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the arc quenching mechanism into multiple independent chambers with standardized designs. This modular segmentation allows for precise manufacturing of individual components that can be assembled with consistent precision, reducing the cumulative tolerance issues that would arise in a single complex integrated structure.
Solution Approach 2:
The patent applies specialized arc quenching structures (such as specific chamber geometries, magnetic field configurations, or cooling arrangements) locally within each arc quenching chamber. This allows high precision to be focused only where it is most critical for arc control, rather than requiring high precision throughout the entire device.
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 prevents safety hazards and maintains contact head mechanism performance by keeping the second test contact point closed during operation, utilizing space efficiently and ensuring a simple, low-cost structure.
Implementation Method 1
a first arc quenching chamber configured to generate a first magnetic field and apply a first electromagnetic force on the arc to quench the arc
Implementation Method 2
a second arc quenching chamber configured to generate a second magnetic field and apply a second electromagnetic force on the arc to quench the arc
Data Source
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AI summary
A circuit breaker is disclosed. The circuit breaker includes a housing assembly, and a contacting system, a leakage protection mechanism and a leakage testing mechanism arranged in the housing assembly, wherein the contacting system includes a handle, a contact head mechanism and an operating mechanism; when the circuit breaker is closed or opened, the operating mechanism is driven by the handle to close or open the contact head mechanism; the leakage testing mechanism includes a leakage testing button, and a leakage testing loop cooperating with a zero-sequence current transformer of the leakage protection mechanism; the leakage testing loop includes a first test contact point cooperating with the leakage testing button, and a second test contact point cooperating with the contacting system, wherein the second test contact point remains closed, and the contacting system breaks the second test contact point when the circuit breaker is opened; and the contacting system makes way for the second test contact point when the circuit breaker is closed, such that the second test contact point resets and remains closed without affecting contact head parameters of the contact head mechanism, thereby ensuring a contact head pressure when the contact head mechanism is closed.