1000 kV输电线路耐张塔带电作业电位转移电流时频特性  

Time-frequency Characteristic of Potential Transfer Current During Live Working on the 1000 kV Transmission Line Tension Tower

作　　者：刘凯 付道睿 吴田 彭勇 黎鹏 刘健犇 LIU Kai;FU Daorui;WU Tian;PENG Yong;LI Peng;LIU Jianben(State Key Laboratory of Power Grid Environmental Protection,China Electric Power Research Institute,Wuhan 430072,China;College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China)

机构地区：[1]中国电力科学研究院有限公司电网环境保护国家重点实验室,武汉430072 [2]三峡大学电气与新能源学院,宜昌443002

出　　处：《高电压技术》2021年第11期3863-3871,共9页High Voltage Engineering

基　　金：国家自然科学基金(51807110);电网环境保护国家重点实验室开放基金项目资助(GYW51201901076)。

摘　　要：特高压输电线路进出等电位过程中的电位转移电流特性是确定带电作业人员的安全防护和智能化装置的抗电磁干扰措施的重要参数。为此采用自触发和自保存的便携式电位转移脉冲电流采集装置对1000 kV交流输电线路沿耐张串进出等电位过程中的电位转移电流进行了测量,对实测的电位转移电流的幅值、脉冲数、脉宽以及比能量等时域特性进行了统计分析,并采用小波分析研究了电位转移电流的频谱能量特性。结果表明:进出等电位过程中,转移电流脉冲峰值平均值达到1179 A,正负脉冲基本呈对称分布,幅值差异较小;转移电荷平均值约为1440μC,比能量为3.996 A^(2)·s左右;进出等电位时,电位转移电流的频谱特性基本一致,频带分布较广,主要分布在6.25~25MHz。测量与仿真计算表明特高压交流耐张绝缘子串电位转移电流的幅值高,且能量主要集中在25 MHz以内,可为人员和智能化设备的防护提供参考。It is of great significance to obtain the potential transfer current characteristics of UHV transmission lines in and out of equipotential process,whose parameters are critical to the safety protection of live workers and the anti-electromagnetic interference measures of intelligent devices.In this paper,the potential transfer current in the process of entering and exiting equipotential along the tension string of 1000 kV AC transmission line is measured by portable potential transfer pulse current acquisition device with self trigger and data save function.The time-domain characteristics of the potential transfer current are analyzed statistically,including amplitude,pulse number,pulse width,specific energy,etc.The spectrum characteristics of the potential transfer current are studied by using the wavelet analysis.The results show that,in the process of entering and exiting equipotential,the average of the transfer current pulse peak value reaches 1179 A.The positive and negative pulses are basically distributed symmetrically,and the difference of amplitude is small.The average value of the transfer charge is about 1440μC,and the specific energy is about 3.996 A^(2)·s.The spectrum characteristics of the potential transfer current in the process of entering and exiting equipotential are basically the same,and the frequency band is widely distributed,mainly at 6.25~25 MHz.Measurement and simulation results suggest that the potential transfer current of UHVAC current is high in amplitude,and the energy is focused on 25 MHz or less,providing a reference for protection of personnel and intelligent devices.

关 键 词：1000 kV 输电线路 带电作业 电位转移电流 频谱特性 

分 类 号：TM84[电气工程—高电压与绝缘技术] TM75