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作 者:赵杰 董继民 张延平 ZHAO Jie;DONG Jimin;ZHANG Yanping(Shanghai Hongtan Intelligent Technology Co.,Ltd,Shanghai 201306)
出 处:《电气技术》2022年第2期79-87,共9页Electrical Engineering
基 金:临港新片区高新产业和科技创新专项(智能微型断路器关键技术研究与应用SH-LG-GK-2020-02-27)。
摘 要:电弧故障易造成设备烧毁并引发火灾事故,对其进行快速有效的诊断是供用电系统安全可靠运行的保证。本文根据电弧故障发生过程中燃弧波形的随机性特征,提出基于多种电气增量融合判据的电弧故障诊断方法。首先根据正弦量等间隔连续三点采样数据特征、连续两周期同一点采样数据关系,快速确定并核实扰动过程;然后计算扰动前一周期及扰动后时间段内每采集一个采样点所构成的每周期电流、电压、实时功率有效值及连续两个周期的电压、电流和功率的变化相对增量、扰动前后的每周期谐波及谐波相对增量;最后基于扰动过程中多种电气增量的单调性变化特征形成融合判据,判定电路是否发生电弧故障。该判据可以快速识别电弧故障,且不受正常负荷增减、非拉弧短路故障特征等引起的扰动现象对电弧故障判定的影响,防止误判。Arc fault is easy to cause equipment burning and fire accidents,the rapid and effective diagnosis is the guarantee of safe and reliable operation of power supply system.According to the random characteristics of arc waveform in the process of arc fault occurrence,this paper proposes an arc fault diagnosis method based on multiple electrical incremental fusion criteria.Firstly,the disturbance process is quickly determined and verified according to the characteristics of sinusoidal continuous three-point sampling data and the relationship between the same point sampling data for two consecutive weeks.Then,the effective values of current,voltage and real-time power in each period formed by each sampling point in the previous period and after the disturbance,the relative increments of voltage,current and power in two consecutive periods,and the relative increments of harmonic and harmonic in each period before and after the disturbance are calculated.Finally,the fusion criterion is formed based on the monotonic variation characteristics of various electrical increments in the disturbance process to determine whether the arc fault occurs in the circuit.This criterion can quickly identify the arc fault,and it is not affected by the disturbance phenomena caused by the increase or decrease of normal load and the characteristics of non-stretching short circuit fault,so as to prevent misjudgment.
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