基于电磁辐射特性的直流电弧检测方法

发布时间：2018-06-06 15:56

本文选题：直流电弧特性 + 电磁辐射脉冲　；参考：《高电压技术》2017年09期

【摘要】：直流电源系统中的直流电弧由于难以熄灭,是导致系统故障的主要原因之一,对其检测方法展开研究具有重要意义。为此提出了一种基于电弧电磁辐射特性的直流电弧检测方法,通过搭建直流电弧产生装置模拟直流系统中松弛连接的情况,设计4阶Hilbert天线测量直流电弧电磁辐射信号。电弧的电磁辐射信号与电流突变信号变化一致,且突变脉冲的时间间隔满足Gamma分布。对不同的电流突变进行频谱分析发现,在该试验条件下,电磁辐射信号在频谱上存在明显的特征频率(12.9 MHz),并且不同回路电流下幅值最大的电磁辐射频率在12~14MHz范围内。与开关操作时的信号进行对比发现,直流电弧的最大幅值电磁辐射频率大于开关操作的最大频率,直流电弧脉冲的平均时间间隔(37μs)比开关操作时的时间间隔(7.4μs)长,开关操作时能够检测到多个持续时间较长的脉冲簇。电磁辐射信号的特征频率、脉冲时间间隔以及脉冲簇持续时间可作为直流电弧的检测参量判断电弧故障。
[Abstract]:The DC arc in the DC power system is one of the main reasons for the failure of the system because it is difficult to extinguish. It is of great significance to study its detection methods. A DC arc detection method based on the characteristics of arc electromagnetic radiation is proposed. The DC arc generation device is built to simulate the relaxation connection in the DC system. The 4 order Hilbert antenna is designed to measure the direct current arc electromagnetic radiation signal. The electromagnetic radiation signal of the arc is in accordance with the change of the current mutation signal, and the time interval of the abrupt pulse satisfies the Gamma distribution. The spectrum analysis of different current mutation shows that the electromagnetic radiation signal has obvious characteristics on the spectrum under this test condition. The frequency (12.9 MHz), and the maximum amplitude of the electromagnetic radiation frequency under the different circuit current in the 12~14MHz range. Compared with the switch operation signal, it is found that the maximum amplitude of the DC arc is greater than the maximum frequency of the switching operation, and the average time interval of the DC arc pulse (37 Mu s) is more than the time of the switch operation. The interval (7.4 s) is long and the switching operation can detect a number of longer duration pulse clusters. The characteristic frequency of the electromagnetic radiation signal, the time interval of the pulse and the duration of the pulse cluster can be used as the detection parameters of the DC arc to judge the arc fault.
【作者单位】：西安交通大学电力设备电气绝缘国家重点实验室;国网江西省电力公司;国网西安供电公司;国网湖南省电力公司电力科学研究院;
【基金】：中国博士后科学基金(2015M572561)~~
【分类号】：TM501.2

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