特高压交流试验线段的无线电干扰特性研究及长线路预测  

Radio Interference Characteristics of UHVAC Test Lines and Prediction for Long Lines

作　　者：何旺龄[1,2] 万保权[2] 刘震寰[2] 裴春明[2] 何俊佳[1] 张锦[2] 

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074 [2]中国电力科学研究院,武汉430074

出　　处：《高电压技术》2014年第12期3953-3960,共8页High Voltage Engineering

基　　金：国家电网公司科技项目(SG0922)~~

摘　　要：为了准确评估特高压交流(UHV AC)输电线路的无线电干扰(RI)水平,利用模态分析法对多导体试验导线进行理论分析。推导得出试验导线终端接3种典型的阻抗网络时,导线正下方的无线电干扰电场强度分布特性,并对两端开路情况下的驻波进行了实际测量。再根据武汉特高压交流试验基地中线路的布置情况,结合短线路的无线电干扰特性,对试验导线所测得的大雨条件下0.5 MHz的无线电干扰值进行数学反推,得到其激发函数值。利用该激发函数值对实际已运行的晋东南—南阳—荆门特高压输电线路的无线电干扰特性进行预测分析和实测对比。实验结果表明:当施加1 050 k V电压时,8×LGJ–500/35导线的激发函数值为39.3 d B;当测试点与中相导线的距离<60 m时,无线电干扰电场强度实测值与激发函数预测值之间的误差基本<2 d B。因此,可以利用数学反推来计算试验线段的激发函数值。In order to accurately evaluate the radio interference（RI） level generated by ultra-high voltage alternating current（UHV AC） power lines, we theoretically analyzed multi-conductor test line using the modal analysis method. The RI field strength distribution characteristics under test lines were deduced when the line terminals were connected to three different typical impedance networks, respectively. Then we measured the standing wave when both line ends were opened. Moreover, on the basis of the test line arrangement in UHV AC Test Base in Wuhan and the RI characteristics of short test lines, we obtained the excitation function value using the mathematical inversion from the measured RI at 0.5 MHz under the condition of heavy rain. Then we applied the excitation function value to predict and analyze the RI distributions of Jindongnan—Nanyang—Jingmen 1 000 k V transmission lines, and compared the results with measured data. The results show that the excitation value of 8×LGJ–500/35 line with applied voltage of 1 050 k V is 39.3 d B, and when the measurement point is less than 60 meters far from the center phase of bundle conductors, the difference between the predicted excitation function values and the measured RI values is less than 2 d B. This proves the feasibility of using the mathematical inversion to calculate excitation function values for short test lines.

关 键 词：特高压交流试验线段 电晕放电 模态分析法 驻波 无线电干扰特性 激发函数 

分 类 号：TM75[电气工程—电力系统及自动化]