输电线路过电压传感器波形解耦及影响其测量精度的相关因素  

Waveform Decoupling and Influence Factors for Transmission Lines Over-voltage Sensor

作　　者：杜林[1] 杨勇[1] 常阿飞[2] 李立浧[3] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]国核电力规划设计研究院,北京100094 [3]中国南方电网有限责任公司,广州510620

出　　处：《高电压技术》2012年第1期52-58,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724504);重庆市科技攻关计划(CSTC.2010AC3051)~~

摘　　要：非接触式电压传感器可测量架空输电线路过电压,其分压比主要取决于导线与传感器的杂散电容。为此,研究了导线与感应金属板之间的距离以及导线半径与过电压传感器分压比的关系,相间耦合的波形解耦及大气条件、电晕效应对架空输电线路分压器分压比的影响。对输电线路与传感器之间的杂散电容的计算公式进行了实验验证。通过理论分析及实验研究,应用多相架空线及传感器的耦合关系,推导出由传感器电压计算母线电压的解耦算法,通过两相耦合实验验证解耦算法能真实还原各相电压。通过温度、湿度、污秽实验分析,证明大气环境对传感器精度影响可以忽略。通过升压法模拟导线起晕,实验表明,电压越高,电晕越严重,非接触式电压传感器分压比越小。A non-contact over-voltage sensor can measure the overvoltage of overhead transmission line,and the divider ratio is decided by the stay capacitance between conductor and sensor.We adopted the waveform decoupling method to study the multi-phase coupled sensors,and investigated the distance between the transmission line and induction metal plate,the radius of the transmission line,atmospheric condition and corona,and influential factors of the divider ratio.The validity of the calculation formula of the stray capacitor between transmission lines and over-voltage sensor was experimentally verified.The two-phase coupling was experimentally studied and theoretically analyzed by applying couple relationship between sensors and multi-phase conductor,and a decoupling method was deduced to calculate the line conductor voltage by sensor voltage.The experiment result shows that the algorithm can recover the line voltage.The experiments at the air temperature,humidity,and the polluted sensor show that the effect of divider ratio by these factors can be ignored.The experiment of the corona-starting voltages of the transmission lines by the raising voltage was carried out.The experiment result also shows that the higher the line voltage is,the stronger the corona phenomenon will be,and the smaller the divider ratio of the non-contact over-voltage sensor will be.

关 键 词：架空输电线路 过电压监测 耦合电容 传感器 解耦算法 分压比 影响因素 

分 类 号：TM866[电气工程—高电压与绝缘技术]