Breaking Tube Arc Path Extension for Current Interruption
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Solution Overview
Problem
Traditional breaking devices face challenges in achieving high fault current breaking capacity, fast interruption, reliability, compactness, cost-effectiveness, wide voltage range operation, and reducing the risk of arc re-ignition while maintaining multiple use capabilities.
Innovation Solution
A breaking device comprising an electrically conducting outer member, an electrically conducting inner member, and an electrically insulating or semiconducting breaking tube that moves along the breaking axis to extend the arc path, creating an electrical potential barrier and effectively extinguishing the arc by lengthening the arc path, thereby interrupting current efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional breaking devices use stacked splitter plates to guide and split the arc, then the arc can be divided into segments, but the device complexity increases and the compactness is reduced
Solution Approach 1:
The patent extracts the essential function of arc splitting from the complex stacked splitter plate arrangement and implements it through a single breaking tube with radial breaking edges. This simplifies the structure by removing unnecessary components while retaining the arc segmentation capability, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The breaking tube incorporates radial breaking edges that segment the arc into multiple sections as it moves along the breaking axis. This segmentation approach achieves reliable arc interruption through a simplified single-component structure rather than multiple stacked plates, resolving the contradiction between reliability and structural complexity
2Speed
If the breaking tube moves from starting position to protruding position to extend the arc path, then the current interruption speed increases, but the device complexity and manufacturing cost increase
Solution Approach 1:
The breaking tube is designed to move dynamically from a starting position to a protruding position, extending the arc path during operation. This dynamic movement enables fast current interruption while maintaining a simple static structure when at rest, resolving the contradiction between speed and device complexity
Solution Approach 2:
The breaking tube extends in the axial direction and moves along the breaking axis to lengthen the arc path. This dimensional approach to increasing interruption speed avoids complex mechanisms by utilizing simple linear motion, resolving the contradiction between speed and manufacturing complexity
3Reliability
If the breaking tube protrudes to interrupt current, then the arc path is lengthened and interruption is more effective, but the volume of the device increases
Solution Approach 1:
The breaking tube can be retracted into or nested within the housing when not in use, and only protrudes when needed for current interruption. This nesting approach allows the device to maintain high breaking capacity when active while minimizing volume during normal operation, resolving the contradiction between reliability and device volume
Solution Approach 2:
The breaking tube transitions from a retracted state to a protruding state only during current interruption. This dynamic configuration enables the device to achieve high arc breaking capacity when needed while maintaining a compact volume during normal operation, resolving the contradiction between reliability and device volume
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 solution provides a reliable, fast, and efficient current interruption with reduced arc re-ignition risk, suitable for multiple uses across various voltage ranges, and can be implemented in both AC and DC applications, with the ability to operate effectively in low to medium voltage ranges.
Implementation Method 1
an arc is ignited, the arc impacts on the edges of the splitter plates and is split in several arc segments
Implementation Method 2
the breaking tube forces the arc to pass from the inner member, over the protruding end of the breaking tube, and to the outer member. The breaking tube thus extends the length of the arc
Data Source
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AI summary
A breaking device (10) for interrupting current, the breaking device (10) comprising an electrically conducting outer member (28); an electrically conducting inner member (30) arranged radially inside the outer member (28) with respect to a breaking axis (34); and an electrically insulating or semiconducting breaking tube (32) arranged radially between the outer member (28) and the inner member (30) with respect to the breaking axis (34), the breaking tube (32) being arranged to move along the breaking axis (34) from a starting position (36) to a protruding position (72) in which the breaking tube (32) protrudes from a space (38) within the outer member (28) for interrupting a current between the outer member (28) and the inner member (30) by means of the breaking tube (32).