1 潜供电流和恢复电压的产生.doc

基于PSCAD的500kV同塔双回输电线路潜供电流和恢复电压的仿真分析 李洁，杨健，张芳，王浩，王国平，岳伟 (内蒙古科技大学，内蒙古 包头 014010) 摘要：文章利用PSCAD对典型500kV同塔双回输电线路建模，通过FAULT模块设置短路故障仿真模拟出了潜供电流和恢复电压波形，从而为重合闸设备的重合时间和相关的继电保护定值相关参数设置提供了依据，并为有效的熄灭线路因静电耦合和电磁耦合产生的二次电弧提供了重要参数。同时深入分析了500kV同塔双回输电线路电抗补偿、短路点位置和土壤电阻率对潜供电流和恢复电压的影响。文章对500kV同塔双回输变电工程的调试、启动和运行具有一定的指导意义。Article 500 kv with double towers of power transmission and transformation project commissioning, start-up and operation has a certain guiding significance. 关键词：同塔双回输电线路；潜供电流；恢复电压 中图分类号：TM863 文献标识码：A 文章编号：1001-1390（2015）00-0000-00 Simulation and analysis of?secondary arc current and recovery?voltage in 500kV double circuit?transmission line based on PSCAD Li Jie, Yang Jian, Zhang Fang, Wang Hao, Wang Guoping, Yue Wei (Inner Mongolia university of Science and Technology, Baotou 014010, Inner Mongolia, China) Abstract: A typical model of 500 kv double circuit transmission on the same tower is established by PSCAD. The waveform of secondary arc current and recovery voltage are simulated through the short-circuit fault set by FAULT module, which provide not only a basis of the reclosing time of switching equipment and the related parameter relay protection value, but also important parameters of the secondary arc produced by electrostatic coupling and electromagnetic coupling. At the same time, the impacts of reactance compensation,?fault location and?soil resistivity on secondary arc current and recovery voltage are analyzed. The model of 500 kV system has important practical significance of design, safe and reliable operation of double circuit transmission line tower. Key words: double circuit transmission line on the same tower, secondary arc current, recovery voltage 0 引言 随着送电电压等级的提高，500kV输变电系统广泛采用同塔双回输电线路，但输变电路线走廊出现越来越紧张的问题，从而导致当一回线路发生瞬时性单相接地故障时，虽自动重合闸装置跳开故障相两端断路器，但在另一回健全相通过静电耦合和电磁耦合继续向故障点提供潜供电流，导致潜供电流燃烧时间较长，使单相自动重合闸的成功率大幅降低。当潜供电流消失后故障点产生的恢复电压同样对系统造成危害[1-2]。现有文献大多采用公式推导法、EMTP、BPA等算法，侧重分析潜供电流和恢复电压的产生机理，定性分析其抑制措施，但缺少全面的影响因素分析和定量的数据分析。针对目前这一现状，基于PSCAD