高海拔地区湿度对直流输电线路电磁环境影响的试验研究

发布时间：2018-12-07 20:50

【摘要】：随着我国特高压直流输电的发展,现已投运了多条超高压、特高压直流输电线路。输电线路的电磁环境参数的计算和控制已成为输电工程设计中必须考虑的重要技术问题。但我国幅员辽阔,高海拔地区的气象特点与平原地区完全不同。在高海拔地区架设直流输电线路应考虑空气密度与湿度对电磁环境的影响。本文利用架设在海拔3400m和海拔4300m处的直流模拟试验线段,对地面合成电场、可听噪声、无线电干扰三种电磁环境参数进行了长期测量,并开展了高海拔地区湿度对直流线路电磁环境影响的探索研究。本文首先对地面合成电场进行了分析。试验研究表明,随海拔高度的增加,地面合成电场逐渐增大,当湿度发生变化时,对地面合成电场的幅值影响较大,但分布特点变化不大,且随着湿度的增加,正负极线下的地面合成电场增大,且增大幅度基本一致。基于地面合成电场测量结果推算了考虑湿度时导线的起晕场强值,通过拟合得到了起晕场强与相对湿度之间的关系式,利用该关系式可估算高海拔地区不同湿度下导线的起晕场强,然后将其应用于现有的地面合成电场计算中便可得到高海拔地区不同湿度下输电线路的地面合成电场,并通过计算分析给出了在满足相关限值的情况下,高海拔地区不同湿度下直流输电线路的最小对地高度建议。最后,对可听噪声和无线电干扰的测量结果进行了分析,结果表明,随着湿度的增加,高海拔直流输电线路产生的可听噪声逐渐降低;而无线电干扰则随湿度的增大而增大。通过本文的研究,可初步得出高海拔地区湿度对于直流线路电磁环境的影响规律及程度,可为高海拔地区的直流输电线路的精细化设计提供宝贵的基础数据。
[Abstract]:With the development of UHVDC transmission in China, many UHV and UHV HVDC lines have been put into operation. The calculation and control of electromagnetic environmental parameters of transmission lines have become an important technical problem in transmission engineering design. However, China has a vast territory and the meteorological characteristics of high altitude areas are completely different from those of plain areas. The influence of air density and humidity on electromagnetic environment should be taken into account in the erection of HVDC transmission lines at high altitude. In this paper, three electromagnetic environment parameters, I. e., synthetic electric field, audible noise and radio interference, are measured for a long time by means of DC analog test lines erected at an altitude of 3400m and 4300m above sea level. The influence of humidity on electromagnetic environment of DC line is studied. In this paper, the synthetic electric field on the ground is analyzed. The experimental results show that the ground synthetic electric field increases gradually with the increase of altitude. When the humidity changes, the amplitude of the ground synthetic electric field is greatly affected, but the distribution characteristics change little, and with the increase of humidity, The ground synthetic electric field increases under the positive and negative pole line, and the amplitude of the increase is basically the same. Based on the measured results of synthetic electric field on the ground, the corona field intensity of conductors considering humidity is calculated, and the relationship between halo field intensity and relative humidity is obtained by fitting. By using this formula, the corona intensity of conductors with different humidity at high altitude can be estimated, and then applied to the existing ground composite electric field calculation, the ground composite electric field of transmission lines with different humidity at high altitude can be obtained. The minimum ground height of HVDC transmission lines with different humidity at high altitude is given through calculation and analysis. Finally, the measurement results of audible noise and radio interference are analyzed. The results show that with the increase of humidity, the audible noise generated by HVDC transmission lines at high altitude decreases gradually, while the radio interference increases with the increase of humidity. Through the research in this paper, the influence of humidity on electromagnetic environment of DC transmission lines at high altitude can be preliminarily obtained, and valuable basic data can be provided for the fine design of HVDC transmission lines at high altitude.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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