线路传输功率对潜供电弧的影响分析.pdf

电力系统及其自动化 ·477 · 线路传输功率对潜供电弧的影响分析 周丽霞 尹忠东 肖湘宁 王苗苗 电力系统保护与动态安全监控教育部重点实验室 华北电力大学 【摘 要】 随着电压等级的提高，潜供电弧对系统的危害越来越明显，线路传输功率是影响潜供电弧 的因素之一，当线路传输不同的有功功率时，母线电压的沿线分布情况也会随之变化，这 就使得线路故障时，健全相在故障相上所感应出来的各分量也会有所变化。本文采用二次 模变换的方法去掉了相间相互的电磁耦合，实现了多相系统的参数解耦，建立了计算同杆 双回输电线路潜供电流的数学模型，并针对线路传输功率的变化，分别计算了不同故障点 处潜供电流的大小。结果表明，线路传输功率对潜供电流的影响较大，且不同故障点处， 潜供电流的变化趋势也不一样，故障点靠近线路首端或末端时，潜供电流会随传输功率的 增大而变大，必须采取有效的抑制措施。 【关键词】 特高压 同杆双回线路 二次模变换 潜供电弧 传输功率 Analysis of secondary arc current under different power transmission Zhou Lixia Yin Zhongdong Xiao Xiangning Wang Miaomiao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Abstract ：Along with the enhancement of voltage level ，the harmful affect of secondary arc current to the system becomes more and more obvious. The power transmission of the lines is one of factors that influence the secondary arc current. The voltage distribution along the transmission line will changes according to the different power transmission ，which will lead to the variation of the induction component from the sound phases when the fault occurs. In this paper ，the twice-mode transformation is adopted to establish the mathematic model of secondary arc current in the double-circuit transmission line. According to the variation of power transmission ，the secondary arc current of different fault point is calculated. The results indicate that secondary ar