架空海缆混合输电线路的闭锁重合闸及测距方法  

The Method to Blocking Auto-reclosing and Fault Location for Hybrid Transmission Line with Overhead Line and Submarine Cable

作　　者：赵志宏[1] 蔡新伟 张月品[1] 杨卉卉[1] 杜兆强[1] 张钊[1] ZHAO Zhihong;CAI Xinwei;ZHANG Yuepin;YANG Huihui;DU Zhaoqiang;ZHANG Zhao(Beijing Sifang Automation Co.,Ltd.,Beijing 100085,China)

机构地区：[1]北京四方继保自动化股份有限公司,北京100085

出　　处：《广东电力》2023年第4期1-10,共10页Guangdong Electric Power

摘　　要：针对某500 kV架空海缆混合输电线路发生区内故障时未能提供准确测距,分析了保护测距出现较大误差以及行波测距失败的原因。考虑到混合线路保护相关设备安装在无人海岛时存在运维难度大的问题,探讨使用安装在架空线上的电流采集终端采集海缆段两侧的电流,通过5G与混合线两侧保护通信,由混合线两侧保护兼顾海缆段的差动计算,实现闭锁重合闸功能。提出了混合线路两侧保护结合海缆段差动计算结果,并基于长线方程实现海缆和架空线分段测距的方法,PSCAD仿真验证以及保护装置试验表明,该方法具有较高的测距精度。A 500kV hybrid transmission line with overhead line and submarine cable failed to provide accurate fault location of the internal fault.The cause of big fault location error of protection IED and failure of fault location by traveling wave were analyzed.To consider that it is difficult to maintain the protection IEDs which are located on an uninhabited island,the current sampling terminals installed on the overhead line measure the current on the 2 ends of submarine cable section.The current sampling terminals can communicate via 5G respectively with protection IEDs at 2 ends of hybrid line to make it possible that the protection IEDs are able to calculate the differential current of the submarine cable section to realize the function of blocking auto-reclosing.A method is proposed that the protection IEDs of both sides of the hybrid line combine with calculated result of the differential current of submarine cable section and based on the long line equation to realize fault location of submarine cable and overhead line by sections.The PSCAD simulation verification and protection IEDs testing show that the method has higher fault location accuracy.

关 键 词：混合输电线路 闭锁重合闸 行波测距 双端测距 分段测距 

分 类 号：TM855.2[电气工程—高电压与绝缘技术]