Dual Cut-Off Circuit Breaker for High Fault Current Interruption
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Solution Overview
Problem
Existing circuit breakers with single cutout structures have limited arc extinguishing capacity and cannot effectively handle high fault currents or rapid protection requirements, particularly in applications like new energy vehicles, where high current overloads or short circuits occur, leading to inadequate protection and potential damage.
Innovation Solution
A circuit breaker design featuring a dual cut-off mechanism with a primary and secondary cut-off mechanism that slide and interrelate, allowing for multiple point cutting and sequential cutting, enhancing arc extinguishing and breaking capacity, and incorporating a fuse body in parallel to improve arc extinguishing capacity further.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single cutout structure is used, then the device complexity is low, but the arc extinguishing capacity is limited
Solution Approach 1:
The primary cut-off mechanism is nested within the secondary cut-off mechanism, with the primary mechanism sliding along the secondary mechanism. This nesting arrangement allows multiple cutouts to be formed by a single integrated mechanism, improving arc extinguishing capacity without proportionally increasing device complexity
Solution Approach 2:
The cut-off mechanism is segmented into primary and secondary cut-off mechanisms that can form multiple cutouts sequentially. This segmentation allows the system to handle high fault currents more effectively by creating multiple arc extinction points, thereby improving reliability
2Reliability
If a single cutout is provided, then the structure is simple, but the breaking capacity for high fault current is insufficient
Solution Approach 1:
The primary cut-off mechanism is accommodated within the secondary cut-off mechanism, allowing both mechanisms to be integrated in a compact arrangement. This enables the formation of multiple cutouts for enhanced breaking capacity while maintaining structural simplicity
Solution Approach 2:
The primary cut-off mechanism is designed to slide dynamically along the secondary cut-off mechanism during operation. This dynamic interaction allows the system to transition from a single cutout to multiple cutouts based on operational requirements, improving breaking capacity without requiring a permanently complex structure
3Reliability
If multiple cutouts are formed, then the arc extinguishing capacity is improved, but the device complexity increases
Solution Approach 1:
The primary and secondary cut-off mechanisms are merged into a single integrated cut-off mechanism where the primary mechanism slides along the secondary mechanism. This merging allows multiple cutouts to be formed by one unified structure, improving arc extinguishing capacity without proportionally increasing device complexity
Solution Approach 2:
The secondary cut-off mechanism serves dual functions: it acts as a structural component and provides a sliding path for the primary cut-off mechanism. This multi-functionality reduces the need for additional separate components, thereby improving arc extinguishing capacity while limiting the increase in device complexity
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 dual cut-off mechanism provides a compact, efficient, and effective means of breaking high fault currents, improving arc extinguishing and insulation properties, and enabling rapid protection without additional space requirements, while the fuse body enhances arc extinguishing capacity for high power applications.
Implementation Method 1
the primary cut-off mechanism slides along the secondary cut-off mechanism
Data Source
AI summary
The present application relates to a circuit breaker comprising a cut-off mechanism configured to cut off a conductor extending through the circuit breaker. The cut-off mechanism includes a primary cut-off mechanism and a secondary cut-off mechanism, and the cut-off mechanism comprises a primary operation phase and a secondary operation phase. In the primary operation phase, the primary cut-off mechanism slides along the secondary cut-off mechanism to execute primary cutting operations, and in the secondary operation phase, the primary cut-off mechanism drives the secondary cut-off mechanism to execute secondary cutting operations.