Abstract：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.
2022, Vol. 23 
