老化输电导线电晕特性及其对电磁环境的影响

发布时间：2018-07-28 21:10

【摘要】：线路运行过程中导线受到老化和积污影响,表面状态发生改变,产生电晕会对线路电磁环境产生不利影响。因此在小型电晕笼内,对广东省南部地区线龄24年的交流LGJ-400/50型及同型号新导线进行电晕实验;同时采用电子显微镜和白光干涉形貌仪对导线样品表面形貌以及表层成分进行了理化分析。根据实验结果对比了运行多年导线和同型号新导线的电晕起始电压、可听噪声和无线电干扰水平;由电晕起始电压计算得到了对应粗糙系数m,并与Peek公式计算值进行对比。结果表明:粤南地区长期运行后导线表面污秽成分中除原有的铝和氧元素外增加了大量的碳、硫、硅、铁、钙、钠、钾等元素;老化导线粗糙程度(轮廓算数平均偏差和轮廓算数均方根偏差)较新导线增大近20倍;长期运行后导线的电磁环境有明显恶化,电晕起始电压下降13.3%,粗糙度(Peek公式计算值)由原0.85下降至0.73;可听噪声和无线电干扰水平有所增加。
[Abstract]:During the line operation, the wire is affected by aging and fouling, the surface state is changed, and the corona will have a negative effect on the electromagnetic environment of the line. Therefore, in the small corona cage, the corona experiment was carried out on the AC LGJ-400/50 type and the same type of new wire with 24 years of line age in the southern part of Guangdong Province. At the same time, the surface morphology and composition of the conductor were analyzed by electron microscope and white light interferometer. Based on the experimental results, the corona starting voltage, audible noise and radio interference level of the same type of conductor and the same type of conductor are compared, and the corresponding roughness coefficient m is calculated from the corona initial voltage, and compared with the calculated value of Peek formula. The results show that, in addition to the original elements of aluminum and oxygen, a large amount of carbon, sulfur, silicon, iron, calcium, sodium, potassium and other elements are added to the contaminated components of the conductors after long term operation in southern Guangdong. The roughness degree (mean deviation of contour arithmetic and root-mean-square deviation of contour arithmetic) of aging conductors is increased by nearly 20 times than that of new conductors, and the electromagnetic environment of conductors is obviously deteriorated after long term operation. The initial corona voltage decreases by 13.3, the roughness (calculated by Peek formula) decreases from 0.85 to 0.73, and the level of audible noise and radio interference increases.
【作者单位】：国家电网冀北电力有限公司;清华大学电机工程与应用电子技术系;清华大学深圳研究生院;
【基金】：国家重点基础研究发展计划(973计划)(2009CB724503) 国家自然科学基金(50777033;50977048)~~
【分类号】：TM85

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