报告详情
Influence of Key Parameters on Pre-arcing Time-Current Characteristics of DC Current-Limiting Fuses
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更新：2026-03-23 16:35:46 浏览：3次
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摘要
The large-scale integration of renewable energy and the rapid expansion of DC distribution networks pose significant challenges for fault interruption due to the absence of natural current zero-crossing in DC systems. This imposes higher requirements on the fast current-limiting and reliable interruption performance of fuses. The structural parameters of the fuse element directly determine the pre-arcing response and are critical to the optimal design. In this study, a sand-filled DC current-limiting fuse is investigated. Five key parameters, including fuse element material, neck radius, neck shape, number of series necks, and quartz sand mesh size, are systematically analyzed to clarify their effects on the pre-arcing time–current characteristics. An electromagnetic–thermal coupled finite element model is established, incorporating temperature-dependent material properties and phase-change latent heat, to evaluate the pre-arcing behavior. The results show that material properties significantly influence the pre-arcing response. When phase-change latent heat is considered, the pre-arcing time of copper elements is approximately 15% longer than silver elements. In terms of geometric parameters, under constant current-carrying cross-sectional area, variations in neck radius have only a minor impact on pre-arcing time. The influence of neck shape mainly arises from differences in effective heating length rather than heat dissipation area. Regarding topological structure, under normal spacing conditions, the thermal processes of series necks are nearly independent. However, short spacing introduces thermal coupling, shortening the pre-arcing time by up to 30%. Additionally, the mesh size of quartz sand affects the pre-arcing process by altering the effective thermal conductivity. Quartz sand with a mesh size of 60–80 increases the pre-arcing time by approximately 10%, indicating that the pre-arcing process cannot be regarded as adiabatic. This study reveals the influence mechanisms of key parameters on the pre-arcing response in fuses and provides quantitative guidance and theoretical references for optimal fuse design.
关键词
DC current-limiting fuses,Pre-arcing characteristics,fuse element structure,key parameters
报告人
Junkai Han
Student Xi'an Jiaotong University稿件作者
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重要日期
-
会议日期
10月25日
2026
至10月28日
2026
-
02月28日 2026
初稿截稿日期
主办单位
西安交通大学
承办单位
西安交通大学
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