Detection Method for Series DC Arc Using Time-Frequency Domain Characteristics of Capacitive Current

doi:10.7652/xjtuxb201812022

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Detection Method for Series DC Arc Using Time-Frequency Domain Characteristics of Capacitive Current

更新时间：2025-05-08

- Detection Method for Series DC Arc Using Time-Frequency Domain Characteristics of Capacitive Current
- Vol. 52, Issue 12, Pages: 152-158+166(2018)
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201812022
  CLC： O441.1
- Online First：10 December 2018，
  
  Published：2018
- 稿件说明：
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Detection Method for Series DC Arc Using Time-Frequency Domain Characteristics of Capacitive Current[J]. 2018, 52(12): 152-158+166.
DOI：

Detection Method for Series DC Arc Using Time-Frequency Domain Characteristics of Capacitive Current[J]. 2018, 52(12): 152-158+166. DOI： 10.7652/xjtuxb201812022.

摘要

针对串联型直流电弧故障产生时伴随着高频分量

提出了一种基于并联电容电流时频特性的串联直流电弧故障检测方法。搭建了直流电弧试验平台

测量流过直流源内部滤波电容支路的电流

检测电容电流中随电弧故障产生的高频电流。在PSCAD/EMTDC软件中建立电弧检测仿真模型

利用Nottingham公式将直流电弧等效为非线性电阻。在仿真平台中对串联电弧产生时的并联电容电流时频特性进行分析

结果表明

串联电弧产生时

并联电容电流出现突变

电容电流频谱中5～50 kHz频带范围内的积分值增加。对不同回路电流、电极材料等工况时的并联电容电流进行试验

研究发现

电容电流变化率与回路电流成正比

与电极材料沸点成反比; 而电容电流频谱积分差值与回路电流成正比

与电极材料沸点成正比。

Abstract

High frequency components accompany when series DC arc happens. A series DC arc fault detection method according to parallel capacitive current with time-frequency characteristics is proposed. A DC arc test platform is constructed to measure the current flowing through the internal filter capacitor of the DC source to detect the high frequency current generated by the arc fault. A simulation model is established with PSCAD/EMTDC

and the DC arc can be equivalent to a nonlinear resistance by the Nottingham formula. On the simulation platform

the time-frequency characteristics of the parallel capacitive current during the series arc generation are analyzed. The results show that when the series arc is generated

the parallel capacitive current changes suddenly

and the integral value in the 5-50 kHz band of the capacitive current spectrum increases. The simulation results are verified in the experiment. The parallel capacitance currents for different loop currents and electrode materials are tested. The rate of change of the capacitive current is proportional to the magnitude of the loop current

and it is inversely proportional to the boiling point of the electrode material. The current spectral integration difference is proportional to the loop current and the boiling point of the electrode material.

关键词

Keywords

references

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