特高压试验线段无线电干扰驻波3维分布计算  

Three-dimensional Distribution Calculation of Radio Interference Standing Wave of UHV Test Line

作　　者：路遥[1] 杨迎建[2] 卫李静[1] 容健纲[1] 黄锐[1] 

机构地区：[1]中国电力科学研究院,武汉430074 [2]国网电力科学研究院,南京211000

出　　处：《高电压技术》2015年第11期3666-3671,共6页High Voltage Engineering

基　　金：国家电网公司项目(GY71-15-033)~~

摘　　要：特高压试验线段是模拟特高压输电线路电晕特性的一种手段,受试验线段长度以及末端开路的影响,电晕电流在空间形成无线电干扰驻波。对试验线段无线电干扰的驻波进行研究,是获得实际线路产生的无线电干扰的基础。鉴于此,采用CISPR推荐的激发函数产生量,求出了单点电晕电流注入量;根据试验线段的电气参数,求得了观测点相对于注入点的传递函数;根据特高压试验线段的末端开路的情况,对注入点电晕电流对计算点的传递函数进行了化简;基于有损大地模型,计算了三相试验线段阻抗导纳矩阵;基于模变换理论,最终求解得到了特高压单回路试验线段下方无线电干扰的3维驻波。计算结果表明,有效计算长度741 m的特高压单回路试验线段,电晕电流产生的0.5 MHz无线电干扰驻波有3个波峰;3 MHz的无线电干扰驻波有15个波峰。无线电干扰驻波的幅值、波峰和波谷出现位置与试验线段的长度和频率均有关系。UHV test lines can be used to simulate corona performance of actual UHV power transmission line. Because test lines have the characteristics of short length and open end, radio interference caused by the test lines is different from that by the transmission line in the process of investigating the standing wave in the space. However, investigating the standing wave of radio interference of test line is the basis to obtain the radio interference value of actual transmission line Therefore,we used the＇ excitation function recommended by CISPR to calculate the injection corona current. Then, we used the electric parameters of the test line to build a transfer function for the current of the injection point and the calcu- lation point. According to the open end of the test line, the transform function of the current injection point and the calculation point was simplified; Based on the lossy ground theory, the impedance and admittance matrix of three-phase test line were calculated; Based on the model transformation theory, the three-dimensional radio interference standing wave of the test line was calculatedl The calculation results are as follows： The effective length of UHV test line is 741 m; For 0.5 MHz, there exit 3 peaks on the standing wave of radio interference in the space; For 3 MHz, there exit 15 peaks on the standing wave of radio interference in the space. The amplitude, the position of peaks, and troughs of standing wave have influences on the length and frequency of the test lines.

关 键 词：特高压 试验线段 无线电干扰 驻波 模变换 激发函数 

分 类 号：TM83[电气工程—高电压与绝缘技术]