高海拔特高压直流试验线路电磁环境初步试验研究

为了研究高海拔地区特高压直流输电线路电晕特性及环境影响,特高压工程(昆明)国家工程实验室在海拔2 100 m处建起一条长800 m的双极直流试验线段,并通过所建立电磁环境自动测试平台,在±(800～1 000)kV电压范围内对电磁环境的参数(RI、Es、Js、NA、CL)进行了长达一年的测量。分析结果显示,无线电干扰RI在极导线投影处达到峰值,处理后的RI值满足行业标准DL/T 1088—2008要求;在±800 kV双极运行时在正极导线在对地投影处的可听噪声NA与离子流密度Js值达到最大,所测量NA与Js数据皆满足行业标准的要求。通过与美国EPRI等机构提出的经验公式进行理论计算数据进行对比,发现在正极导线及外侧其测量值与计算值能够很好的吻合,但在负极侧有较大差异,意味着高海拔地区的导线电晕机理尚需进一步研究。

Primary Experiment Study on the Electromagnetic Environment of UHVDC Test Line at High Altitude

In order to study the corona characteristic and the environment effect of the UHVDC power transmission line at high altitude,a biapolar UHVDC test line is completed in the National Engineering Laboratory for UHV Engineering Technology,Kunming,China,which is 800 m of length and at 2100m of altitude.With the automotive electromagnetic environment testing system installed under the line,the measurements of electromagnetic environment parameters（RI、Es、Js、NA、CL） have been carried out at various voltage from ±800 kV to ±1000 kV for one year time.The analysis results show that the RI reaches its peak value at the polar conductor projection position,and its value after treatment meets the requirement of the industry standard DL/T 1088-2008.The NA and Js reach their max values at the projection position of positive pole while the bipolar operation is under ±800 kV,and the measured data of the two parameters all meet the industry standards.In comparison with the theoretical calculation results by EPRI,both the measured and calculated results in this paper match them well at the positive pole,but are different obviously with them around the negative pole.This means that the corona mechanism of UHVDC transmission line at high altitude needs further research.