基于不等高悬点的特高压直流输电线路无线电干扰研究  

Radio Interference from UHVDC Transmission Lines Based on Polished Rod with Unequal Height

作　　者：唐波[1,2] 冯天佑[3] 崔忠宁[3] 

机构地区：[1]三峡大学电气信息学院,湖北宜昌443002 [2]国网电力科学研究院,湖北武汉430074 [3]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《高压电器》2010年第7期11-15,共5页High Voltage Apparatus

基　　金：国网科技项目(SG0925)

摘　　要：以国际无线电干扰特别委员会双极直流线路无线电干扰计算公式为基础,研究了不等高悬点下的特高压直流输电线路无线电干扰水平。通过镜像法,得到了线路平均高度的等效电荷,根据规程计算该高度下的导线最大表面场强。针对目前计算输电线路无线干扰时,传统计算方法采用导线最小对地高度为导线对地平均高度减去三分之一弧垂的情况,推导了导线平均高度计算公式,探讨了线路档距为不等高时,导线最小对地高度的求解方法。以向家坝—上海±800kV直流线路为例,研究了线路无线电干扰的分布情况,并对两种计算方法得到的结果进行了比较,发现大档距和大高差下,需要综合考虑档距、高差和气象对无线电干扰的影响。According to the radio interference equation of bipolar DC transmission lines drawn by international special committee on radio interference,the radio interference from UHVDC transmission lines based on polished rod with unequal height is discussed. The equivalent charge of conductor at average height is acquired by using image method,and the maximum field strength on conductor surface is calculated by regulation method. During the calculation of radio interference,the minimum height to ground is the result that the average height subtract one third of arc sag,which is the traditional calculation method. In order to have more accurate value,the minimum height to ground is redefined based on polished rod with unequal height,and the average height equation of conductor is deduced. Based on the ±800 kV DC transmission line of Xiangjiaba to Shanghai,the distribution of radio interference is discussed,and the result drawn by two calculation methods is compared. It is found that the span distance,the height difference,and the meteorological are needed to take into account during the radio interference calculation,especially the transmission line with long span distance and large height difference.

关 键 词：特高压直流 档距 高差 导线平均高度 无线电干扰 

分 类 号：TM721.1[电气工程—电力系统及自动化]