特高压直流线路可听噪声及电晕放电试验研究

发布时间：2018-04-18 11:31

本文选题：特高压直流 + 可听噪声　；参考：《华北电力大学(北京)》2016年硕士论文

【摘要】：随着特高压直流输电的发展,输电线路的电磁环境成为线路设计过程中必须着重考虑的问题。可听噪声和电晕放电是直流线路电磁环境的重要考核指标。本文以此为出发点,针对直流输电线路的可听噪声和电晕放电现象进行了试验研究,主要工作如下：基于国家电网公司特高压直流试验基地的户外大电晕笼,对导线电晕可听噪声的相关测试方法进行了研究。研究结果表明,开展可听噪声试验时,可利用单正极电晕笼测试代替双极测试；在地面铺设吸声材料可有效降低地面反射对测试结果的影响；不同的测试探头可互相校验数据的有效性。基于电晕笼内可听噪声测试方法,研究并得出了导线可听噪声与导线表面电场强度的关系。为了进一步分析电晕可听噪声的特性,需要把电晕噪声和环境噪声区分开来。本文基于谱包络面积和谱不规律性这两个重要的音色参数,对电晕噪声频谱和环境噪声频谱进行了低频、中频、高频三个频段的对比分析,研究了环境噪声和电晕噪声在不同电压等级下的频谱特性。研究结果表明：高频段的谱包络面积可有效的区分电晕噪声和环境噪声；高频段谱包络面积、中频段谱包络面积和中频段谱不规律性都可用来区分导线的不同电晕放电状态；研究某个电压等级下的可听噪声时可选取中频谱包络面积较小且谱不规律性较小的频谱数据。本文最后对我国西部高海拔地区的电晕放电现象进行了试验研究,基于紫外成像检测技术测试了电晕放电过程中紫外光子数的变化。重点研究了光子在大气传播过程中的衰减规律,通过理论推导获得了根据紫外成像仪示数计算导线电晕放电点光子数的公式。根据计算所得的光子数试验数据对正负极导线的光子数变化特性和起晕电压做了对比研究,这对应用紫外成像技术检测电晕放电有一定的指导意义。
[Abstract]:With the development of UHVDC transmission, the electromagnetic environment of transmission line must be considered in the course of line design.Audible noise and corona discharge are important assessment indexes of DC line electromagnetic environment.In this paper, the audible noise and corona discharge phenomena of HVDC transmission lines are studied experimentally. The main work is as follows: based on the outdoor large corona cage in the UHV DC test base of State Grid Company,In this paper, the corona audible noise measurement method is studied.The results show that the single positive corona cage test can be used to replace the bipolar test when the audible noise test is carried out, and the influence of ground reflection on the test results can be effectively reduced by laying sound absorbing materials on the ground.Different test probes can check the validity of the data.Based on the measurement method of audible noise in corona cage, the relationship between wire audible noise and electric field intensity of conductor surface is studied and obtained.In order to further analyze the characteristics of corona audible noise, it is necessary to distinguish corona noise from ambient noise.Based on the two important timbre parameters of spectral envelope area and spectral irregularity, this paper compares and analyzes the corona noise spectrum and the ambient noise spectrum in three frequency bands: low frequency, middle frequency and high frequency.The spectrum characteristics of ambient noise and corona noise at different voltage levels are studied.The results show that the spectral envelope area of high frequency band can effectively distinguish corona noise from ambient noise, and the spectral envelope area of high frequency band, the envelope area of middle frequency band and the irregularity of spectrum of middle frequency band can be used to distinguish the different corona discharge states of conductors.In the study of audible noise at a certain voltage level, spectrum data with smaller spectrum envelope area and less spectral irregularity can be selected.Finally, the corona discharge in the high altitude area of western China is studied experimentally, and the changes of ultraviolet photons during corona discharge are measured based on the ultraviolet imaging technique.The attenuation law of photons in atmospheric propagation is studied emphatically. The formula for calculating the photon number of conductor corona discharge point is obtained by theoretical derivation according to the sign number of ultraviolet imager.Based on the calculated photon number test data, the characteristics of photon number variation and the corona voltage of positive and negative conductors are compared and studied, which has a certain guiding significance for the detection of corona discharge using ultraviolet imaging technology.
【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】：2016
【分类号】：TM75

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