Circuit Breaker Contact Zone Arc Protection
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Solution Overview
Problem
Circuit breakers experience wear and damage due to arcs formed during the commutation process between nominal and arcing contacts, leading to reduced contact quality and increased wear at the contact points.
Innovation Solution
The circuit breaker design incorporates two contact points separated by a distance along the longitudinal axis, with a dent in between, to prevent arc damage from reaching the contact zone, and uses a specific angle and spring mechanism to ensure reliable contact and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the contact fingers are positioned close to the tube or rod for efficient closing, then the closing speed and efficiency are improved, but arcs formed at the impact point damage the contact zone and increase wear
Solution Approach 1:
The patent introduces a longitudinal dimension (distance along the contact surface) to separate the impact point from the contact zone. By positioning contact points at a distance of 5-12mm from the impact point in the longitudinal direction, the harmful arcs generated during impact do not reach the electrical contact zones, thus protecting them from damage while maintaining efficient closing operation.
2Device complexity
If a single contact point is used for electrical connection, then the device complexity is reduced, but the contacting capability and reliability are insufficient
Solution Approach 1:
The contact zone is segmented into multiple contact points (at least two) distributed along the longitudinal axis of the contact finger. This segmentation provides multiple separate contact zones that are spaced apart, ensuring that arcs from the impact point cannot bridge all contact points simultaneously, thereby improving reliability while maintaining relatively simple structure.
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 enhances contact quality and reduces wear by increasing the distance between the impact and contact points, preventing arc-induced damage and ensuring consistent electrical connection.
Implementation Method 1
uses a specific angle and spring mechanism to ensure reliable contact and reduce wear
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a circuit breaker comprising a first and a second contact assembly (1, 2), wherein one of the contact assemblies (1) comprises contact fingers arranged in a finger cage configuration and the other contact assembly (2) comprises a tube or rod contact. The contact fingers (1) comprise an impact point (3) where the tube or rod (2) impacts the contact fingers (1) for the first time during electrical connection establishment, and a contact zone which contacts the tube or rod (2) when the electrical connection is established. The contact zone comprises two contact points (4) separated from one another and arranged on a line which is perpendicular to the longitudinal axis (z).