Circuit Breaker Busbar Layout for Fast Arc-Limiting Interruption
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Solution Overview
Problem
Conventional circuit breakers have slow breaking speeds when dealing with large currents, leading to potential safety hazards and reduced service life due to arc generation during line disconnection.
Innovation Solution
A circuit breaker design with first and second busbars at either end of an electrical component, where the component cuts off the connection between the busbars upon detecting an abnormality, followed by an actuating mechanism to disconnect the line, reducing arc generation and improving response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional circuit breakers are used to disconnect lines during abnormalities, then the circuit breaker can cut off current, but the breaking speed is slow when dealing with large currents, leading to arc generation and reduced service life
Solution Approach 1:
The circuit breaker is divided into two functional parts: an electrical component (such as a MOSFET) that quickly cuts off the connection between first and second busbars, and an actuating mechanism that disconnects the line. This segmentation allows the electrical component to handle the fast breaking of large currents without arc generation, while the actuating mechanism completes the line disconnection, thereby improving both breaking speed and service life.
2Speed
If the electrical component directly disconnects the line during abnormality, then the response speed is improved, but the actuating mechanism and busbars may be damaged by large currents and arcs
Solution Approach 1:
The electrical component performs a preliminary action by quickly cutting off the connection between the first and second busbars when an abnormality is detected. This preliminary cutoff prevents large currents from reaching the actuating mechanism and busbars, protecting them from damage while enabling fast response. The actuating mechanism then safely disconnects the line after the electrical component has already limited the current.
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
Enhances response speed, reduces arc generation, and prolongs the service life of the circuit breaker by improving stability during long-time and large-current operations.
Implementation Method 1
a heat pipe coupled to the contact plate and adapted to extend in a first direction
Implementation Method 2
a plurality of heat dissipation fins coupled to the heat pipe at intervals along the first direction
Data Source
AI summary
A circuit breaker for an electrical device and an electrical system are provided. The circuit breaker includes a housing, at least one first busbar, at least one second busbar, a circuit board, and an actuating mechanism. The first busbar is coupled to a power supply side of the circuit breaker. The second busbar is coupled to a load side of the circuit breaker. The circuit board is arranged between the at least one first busbar and the at least one second busbar and includes an electrical component, two ends of the electrical component are respectively coupled to the first busbar and the second busbar, and the electrical component is adapted to act during occurrence of a line abnormality to cut off the electrical connection between the first busbar and the second busbar. The actuating mechanism is arranged between the first busbar and the power supply side of the circuit breaker.