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

发布时间：2018-05-11 11:57

本文选题：特高压交流试验线段 + 电晕放电　；参考：《高电压技术》2014年12期

【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。
[Abstract]:In order to accurately evaluate the radio interference (RI) level of UHV AC) transmission lines, a theoretical analysis of multi-conductor test conductors is carried out by using modal analysis method. The characteristics of electric field distribution of radio interference directly below the test wire are derived when the test wire is connected with three typical impedance networks, and the standing wave at both ends of open circuit is measured in practice. According to the arrangement of the line in Wuhan UHV AC test base and the radio interference characteristics of short line, the radio interference value of 0.5 MHz measured by test wire under heavy rain condition is mathematically inferred and the excitation function value is obtained. By using the excitation function, the radio interference characteristics of the actual operating line from Jindong to Nanyang to Jingmen UHV transmission line are forecasted and compared. The experimental results show that the excitation function of 8 脳 LGJ / 500 / 35 conductor is 39.3 dB when the voltage is 1 050 kV, and the error between the measured value of radio interference electric field intensity and the predicted value of excitation function is about 2 dB when the distance between the test point and the mesophase conductor is 60 m. Therefore, the excitation function of the test line segment can be calculated by mathematical backstepping.
【作者单位】：华中科技大学电气与电子工程学院;中国电力科学研究院;
【基金】：国家电网公司科技项目(SG0922)~~
【分类号】：TM75

【参考文献】