海拔3320 m的750 kV交流输电线路无线电干扰长期测试分析  

Long-term Measurement and Analysis of Radio Interference from 750 kV AC Transmission Lines at an Altitude of 3320 m

作　　者：张业茂 路遥 周兵 廖正海 刘健犇 陈玉龙 ZHANG Yemao;LU Yao;ZHOU BING;LIAO Zhenghai;LIU Jianben;CHEN Yulong(State Key Laboratory of Power Grid Environmental Protection,China Electric Power Research Institute,Wuhan 430074,China)

机构地区：[1]中国电力科学研究院有限公司电网环境保护全国重点实验室,武汉430074

出　　处：《高电压技术》2025年第4期1889-1900,共12页High Voltage Engineering

基　　金：国家自然科学基金(52177010;52277009);中国电力科学研究院研究开发项目(GY83-22-011)。

摘　　要：为获取我国实际运行的高海拔交流输电线路无线电干扰水平与特性,该文选取青藏高原地区海拔3320 m的750 kV交流输电线路建立观测站,开展了持续2年的无线电干扰长期观测,获取了92万组有效数据。将每1年度的测量数据分为好天气、大雨、中小雨、大雪、中小雪、雾霾共6种天气,得到了不同天气下的统计结果。研究结果表明,750 kV刚察观测站大雨、好天气下的无线电干扰平均值分别为69.09、49.22 dB,全天候无线电干扰小于58 dB的概率为95%,满足限值要求;同一种天气下不同年度的无线电干扰平均值差别很小,对于获取长期运行的交流输电线路无线电干扰水平,1年的观测时间已经足够;提出了通过雨雪天气的短期观测,快速获取近似1年长期测试下大雨天气无线电干扰平均值的方法,用于输电线路无线电干扰评估,可节约成本和提高效率;IEC/CISPR无线电干扰预测结果较实测值偏大约4 dB,需要对高海拔线路无线电干扰预测方法开展进一步研究。To obtain the radio interference(RI)levels and characteristics of high-altitude AC transmission lines in China,an observation station was established on a 750 kV AC transmission line in the Qinghai-Tibet plateau at an altitude of 3320 m.A two-year long-term RI observation was conducted,collecting 920000 valid data sets.The measurement data for each year were classified into six weather categories,namely,fair weather,heavy rain,light to moderate rain,heavy snow,light to moderate snow,and haze weather,and statistical results for each weather condition were obtained.The study shows that the average RI at the Gangcha observation station during heavy rain and fair weather is 69.09 dB and 49.22 dB,respectively.The probability of RI being below 58 dB across all weather conditions is 95%,meeting the limit requirements.The difference in average RI for the same weather conditions across different years is minimal,and a one-year observation period is sufficient for determining the long-term RI levels of AC transmission lines.Furthermore,a method was proposed to quickly obtain the approximate average value of RI during heavy rain by conducting short-term observations during periods of heavy rain or snow,comparable to the average RI obtained from one year of long-term testing.This method can be utilized to assess the RI levels of transmission lines,significantly reducing costs and improving efficiency.The RI prediction results based on IEC/CISPR standards are approximately 4 dB higher than the measured values,thus the prediction methods for RI in high-altitude transmission lines need to be further researched.

关 键 词：高海拔 交流输电线路 750 kV 无线电干扰 长期观测 

分 类 号：TM726[电气工程—电力系统及自动化]