Arc-Interrupter Fuse Structure for Compact High-Current Breaking
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Solution Overview
Problem
Traditional high voltage, high amperage fuses for power feeders are large, costly, and create high contact resistance or constrictions, while sand-filled fuses form arcs that reduce their effectiveness in breaking faulty circuits.
Innovation Solution
A fuse design featuring a ceramic housing with an arc interrupter biased by a spring, a bus bar with different melting temperature materials, and a flow diverter to separate bus bar portions and divert molten material, reducing arcing and contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sand-filled cavities are used in traditional high voltage high amperage fuses, then the arc is effectively suppressed by melting sand to glass, but the fuse becomes very large and costly
Solution Approach 1:
The patent changes the material parameters by using a low melting point material (such as bismuth, lead, or zinc alloy) instead of sand, allowing the arc suppression mechanism to work at lower temperatures and with less material volume. This enables the fuse to maintain arc suppression effectiveness while significantly reducing size and cost.
Solution Approach 2:
The patent employs a composite structure combining a low melting point material with a ceramic housing and metal bus bar. The low melting point material forms a molten barrier that suppresses arcs, while the ceramic housing provides structural support and electrical insulation, and the metal bus bar conducts current. This composite approach achieves effective arc suppression in a compact design.
2Reliability
If conventional high energy fuses are used, then circuit breaking is achieved, but high contact resistance power joints or constrictions are created in the power bus routing
Solution Approach 1:
The patent extracts the arc suppression function from the bus bar structure itself by introducing a separate low melting point material that forms a dedicated barrier. This prevents the bus bar from developing contact resistance or constrictions during operation, as the arc suppression occurs in the low melting point material rather than at the bus bar contact points.
Solution Approach 2:
The low melting point material acts as an intermediary between the power bus bar and the arc. When an arc forms, the low melting point material melts first to create a molten barrier that interrupts the arc before it can damage the bus bar or create harmful contact resistance. This protective intermediary preserves the electrical integrity of the power routing.
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 design effectively mitigates arcing and ensures complete circuit breaking, allowing for smaller, more efficient fuses with lower contact resistance and improved performance in high energy applications.
Implementation Method 1
A biasing element is compressed between the housing and the arc interrupter to bias the arc interrupter toward the bus bar to separate two portions of the bus bar during circuit interruption
Implementation Method 2
The first material can have a higher melting temperature than the second material... A reservoir can be defined in the housing below the pocket in the bus bar with respect to gravity for receiving the second material in molten form during circuit interrupt
Implementation Method 3
An arc interrupter is positioned inside the housing... to separate two portions of the bus bar during circuit interruption to mitigate arcing from one portion of the bus bar to the other portion of the bus bar
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A fuse (100) includes a housing (102). A bus bar (108) extends through the housing (102). An arc interrupter (110) positioned inside the housing (102). A biasing element (112) is compressed between the housing (102) and the arc interrupter (110) to bias the arc interrupter (110) toward the bus bar (108) to separate two portions of the bus bar (108) during circuit interruption to mitigate arcing from one portion of the bus bar to the other portion of the bus bar. The bus bar (108) includes a pocket (114) defined therein wherein the bus bar (108) is of a first material, and wherein a second material is seated within the pocket (114). In another aspect, a fuse (100) includes a fuse housing (102) and a bus bar (108) extending through the housing (102). The bus bar (108) includes a pocket (114) defined therein. The bus bar (108) is of a first material, wherein a second material is seated within the pocket (114).