脉冲电流条件下同轴电缆温度分析及优化设计

Thermal Analysis and Optimal Design of Coaxial Cables under Pulse Current Condition

脉冲功率电源系统与耗能装置之间通过同轴电缆连接,在连续快速脉冲大电流工况下同轴电缆会快速升温。针对该问题,在土壤直埋敷设条件下建立同轴电缆有限元电-热耦合模型,对比分析不同数量和不同排列方式下同轴电缆在多循环通、断电时的温升特性,同时考虑敷设深度对电缆温度的影响。在此基础上,提出两种新型电缆排列方式以改善温度分布。结果表明,随着电缆数量的增加,电缆的最高温度呈上升趋势,但并非比例增长;在相同电缆数量和电缆间距的前提下,多层电缆排列方式相较于单层电缆虽然占用空间较小,但温度更高;随着敷设深度的增加,电缆温度呈逐渐升高的趋势,当敷设深度为1237.50 mm时,电缆温度达到最高,而超过该深度时,电缆温度又显著降低。提出的新型电缆排列方式不仅降低了占用空间,同时还实现了电缆温度的降低。

Pulse power supply system is connected to energy consumption device through a coaxial cable,which can cause excessive temperature rise under the continuous fast pulse high current condition.In response to this issue,a finite element electrical-thermal coupling model of coaxial cables was established under the condition of direct burial in soil.Temperature rise characteristics of coaxial cables under different quantities and arrangement modes during power on and off were compared and analyzed,the impact of laying depth on cable temperature was considered as well.On this basis,two new cable arrangement methods were proposed to improve temperature distribution.Results indicated that as the number of cables increased,the maximum temperature of cables showed an upward trend,but not a proportional increase;Under the premise of the same number of cables and cable spacing,arrangement of multi-layer cables took up less space but had a higher temperature compared to single-layer cables;As laying depth increased,the temperature of cables gradually increased;When laying depth was 1237.50 mm,cable temperature could reach the maximum,and then significantly decreased once the depth exceeded the point.The proposed new cable arrangement could not only reduce the occupied space,but also achieve a reduction in cable temperature.