Melting Conductor Segmentation for DC Fuse Protection
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Solution Overview
Problem
Current DC fuse technologies are inadequate for high-voltage and high-power applications, failing to provide effective short-circuit and overload protection, leading to safety concerns and operational failures in direct current distribution networks.
Innovation Solution
A melting conductor with an electrically conductive wire featuring multiple overload narrow sections and layers, including a solder-coated first layer and an insulating second layer, designed to efficiently disconnect DC currents in both short-circuit and overload scenarios, reducing the minimum breaking current and allowing for compact fuse designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DC fuse designs are used, then the fuse structure is simple, but the fuse cannot provide effective short-circuit and overload protection for high-voltage high-power applications
Solution Approach 1:
The melting conductor is divided into multiple sections with different cross-sectional areas, creating distinct functional zones: a first section with a first cross-sectional area for overload protection, a second section with a second cross-sectional area for short-circuit protection, and a third section with a third cross-sectional area. This segmentation allows each section to respond to different fault conditions, enabling the fuse to provide both overload and short-circuit protection through a single device without requiring multiple separate protection mechanisms.
Solution Approach 2:
Different sections of the melting conductor are designed with different local properties (cross-sectional areas) to optimize performance for specific protection functions. The first section has a larger cross-sectional area to withstand overload currents, while the second section has a smaller cross-sectional area to respond quickly to short-circuit conditions. This local differentiation of properties enables the fuse to handle multiple protection scenarios effectively.
2Volume of moving object
If the fuse is designed for compact dimensions, then the fuse size is reduced, but the minimum breaking current increases
Solution Approach 1:
The melting conductor transitions from a uniform cross-section design to a variable cross-section design along its length, utilizing the longitudinal dimension to create different functional zones. This dimensional variation allows the fuse to maintain compact overall volume while incorporating multiple cross-sectional areas that provide different breaking current characteristics, effectively decoupling size reduction from breaking current increase.
3Ease of manufacture
If the melting conductor has uniform cross-section, then the manufacturing is simple, but the fuse cannot distinguish between overload and short-circuit conditions
Solution Approach 1:
The melting conductor is segmented into sections with different cross-sectional areas, creating distinct functional zones that respond differently to various fault conditions. This segmentation enables the fuse to discriminate between overload and short-circuit conditions by observing which section melts first or how the conductor fails, providing versatile protection discrimination capability while maintaining a relatively simple manufacturing process.
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 enables reliable and efficient protection of high-voltage DC systems by safely interrupting short-circuit and overload currents, preventing thermal and mechanical stress, and ensuring long-term safety and maintenance-free operation.
Implementation Method 1
The first layer (7) comprises solder as a material and/or consists thereof. Adjacent to each of the overload narrow sections (4), in each case in a second section (8), a second layer (9) is provided circumferentially surrounding the outer shell surface (6) of the melting wire (3).
Implementation Method 2
The melting conductor (1) comprises an electrically conductive melting wire (3). The melting wire (3) comprises at least two overload narrow sections (4) formed as cross-sectional constrictions.
Data Source
AI summary
The invention relates to an use of a melting conductor (1) for a DC fuse (2) and a high-voltage high-power fuse (2) (HH-DC fuse), wherein the melting conductor (1) comprises an electrically conductive melting wire (3), wherein the melting wire (3) comprises at least two overload narrow sections (4) in the form of a cross-sectional constriction, wherein, preferably between the two immediately successive overload narrow sections (4) a first layer (7) comprising solder and/or surrounding the outer shell surface (6) of the melting wire (3) circumferentially at least in some areas, preferably completely, is provided in at least one first section (5), and wherein a second layer (9) surrounding the outer shell surface (6) of the melting wire (3) circumferentially at least in some areas, preferably completely, is provided adjacent to each of the overload narrow sections (4) in a respective second section (8).