特高频电磁波在变压器放油管道内的传播规律

发布时间：2018-06-17 23:43

本文选题：变压器 + 局部放电　；参考：《电网技术》2014年03期

【摘要】：放油阀式特高频(ultra-high-frequency,UHF)检测方法适用于变压器内部局部放电故障的带电检测。UHF检测装置的工作频带和安装位置是影响其检测灵敏度的关键因素。依据圆波导理论分析了UHF电磁波在放油管道内的传播特性,通过电磁波仿真和实验测试分析了UHF电磁波在放油管道内传播时的衰减程度,探究了衰减机理。研究结果表明,UHF电磁波进入放油管道传播时,低于TE11波截止频率的成分衰减严重,等于或大于此频率的成分几乎不衰减。提出了提高放油阀式UHF检测系统灵敏度的方法,即:传感器的探入位置应尽量靠近变压器内壁;UHF检测系统的频率下限应不低于主模截止频率。此研究成果对于提高变压器局部放电带电检测技术具有重要价值。
[Abstract]:The working frequency band and installation position of the ultra-high-frequency UHF (ultra-high-frequency UHF) detection method suitable for the live detection of partial discharge faults in transformers are the key factors affecting the detection sensitivity. According to circular waveguide theory, the propagation characteristics of UHF electromagnetic wave in oil discharge pipeline are analyzed. The attenuation degree of UHF electromagnetic wave propagating in oil discharge pipeline is analyzed by electromagnetic wave simulation and experiment, and the attenuation mechanism is explored. The results show that when the UHF electromagnetic wave propagates into the oil discharge pipeline, the component below the cut-off frequency of the TE11 wave attenuates seriously, and the component equal to or greater than this frequency almost does not attenuate. The method to improve the sensitivity of the oil release valve UHF detection system is proposed, that is, the detection position of the sensor should be as close as possible to the transformer inner wall UHF detection system, the lower frequency limit of the UHF detection system should not be lower than the main mode cutoff frequency. This research result has important value to improve transformer partial discharge live detection technology.
【作者单位】：国网福建省电力有限公司电力科学研究院;
【分类号】：TM855.1

【相似文献】