Detection Method for DC Arc Based on Electromagnetic Radiation Characteristics

被引：0
|
作者：
Xiong Q. [1 ]
Xiao R. [2 ]
Ji S. [1 ]
Zhu L. [1 ]
Liu Y. [3 ]
Zhong L. [4 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an
[2] State Grid Jiangxi Electric Power Company, Nanchang
[3] State Grid Xi'an Electric Power Supply Company, Xi'an
[4] Electric Power Research Institute of State Grid Hunan Electric Power Company, Changsha
来源：
Xiong, Qing (xiongqing@stu.xjtu.edu.cn) | 2017年 / Science Press卷 / 43期
基金：
中国博士后科学基金;
关键词：
Abrupt change of arc current; Arc fault detection; Characteristics of DC arc; Electromagnetic radiation pulse; Hilbert antenna; Switch operation;
D O I：
10.13336/j.1003-6520.hve.20170831026
中图分类号：
学科分类号：
摘要：
DC arc is the main cause of system faults since it is hard to extinguish DC arc in DC source systems. Therefore, it is of great significance to find an appropriate method to detect DC arc. A detection method for DC arc based on electromagnetic radiation characteristics is proposed. A DC arc generating device is built to simulate the relaxing connection in DC systems. A fourth-order Hilbert antenna is designed to detect electromagnetic radiation signals of DC arc. The electromagnetic signals of arc are in accordance with the abrupt change of current, and the interval of the abrupt current pulse meets Gamma distribution. The spectra of different abrupt change of current are analyzed. The results indicate that, under the present conditions, the electromagnetic signals have an obvious characteristic frequency (12.9 MHz), and the maximum amplitude frequencies under different circuit current are in a range of 12~14 MHz. The maximum amplitude frequency of DC arc is higher than the frequency when operating switchgear. The interval of DC arc (37 μs) is longer than that of switch operations (7.4 μs). Multiple long duration pulse clusters can be detected when operating switchgears. The results indicate that the characteristic frequency, pulse interval, and pulse clusters duration of electromagnetic radiation signals can be used as the detection parameters of DC arc to identify arc faults. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
引用
收藏
页码：2967 / 2975
页数：8
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