三相电缆护层的感应电压影响因素分析-《高速铁路技术》

文章信息/Info

Title:: Analysis on Influencing Factors of Induced Voltage of Three-phase Cable Sheath

作者:: 缪晓宇; 胡豪; 杨佳; 李瑞芳; 曹晓斌; 1. 中铁二院工程集团有限责任公司, 成都 610031;
2. 西南交通大学, 成都 610031

Author(s):: MIAO Xiaoyu; HU Hao; YANG Jia; LI Ruifang; CAO Xiaobin; 1. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China;
2. Southwest Jiaotong University, Chengdu 610031, China

Keywords:: three-phase cable|cross interconnection|metal sheath|induced voltage

摘要:: 铁路供电系统采用电缆输电时，线芯电流由于电磁感应会在金属护层产生感应电压，过大的感应电压对于电缆系统的运行会造成威胁。为了研究电缆护层感应电压的影响因素，本文运用PSCAD仿真软件对护层感应电压做出了分析。结果表明：（1）同等敷设间距下，水平敷设的护层感应电压>直角三角形敷设>正三角形敷设，且三相电缆应该减小电缆的敷设间距；（2）电缆交叉互联循环中不均匀分段对护层感应电压影响很小，但对护层环流影响较大；（3）不平衡相电缆的线芯电流对正常相电缆的护层感应电压的影响成线性关系，且两相不平衡的影响大于一相不平衡。

Abstract:: When the railway power supply system uses cable to transmit electricity, the core current will generate induced voltage in the metal sheath due to electromagnetic induction. Excessive induced voltage will pose a threat to the operation of the cable system. In order to study the influencing factors of the induced voltage in the cable sheath, this paper uses PSCAD simulation software to analyze the induced voltage in the sheath. The result show that:(1) under the same laying distance, the induction voltage in the sheath in horizontal laying > right-angled triangle laying > equilateral triangle laying, and the three-phase cable should reduce the laying distance of the cable; (2) the uneven segmentation in the cable cross-interconnection cycle has little effect on the induced voltage in the sheath, but has a greater influence on the circulation of the sheath; (3) the core current of the unbalanced phase cable has a linear relationship with the influence of the induced voltage in the sheath of the normal phase cable, and the influence of the two-phase imbalance is greater than the one-phase imbalance.