Research On Diagnosis Method Of Low Voltage Series Arc Fault

The safe and stable operation of electrical equipment is the problem of economic development and people’s daily lives. With the rapid development of technology, the application of electrical equipment in various fields of the world is expanding. How to use electricity safely has become one of the many problems people care about. If the power lines and related electrical equipment in a series fault arc, it can increases the cause of the electrical fire accident probability and the personal safety and production equipment from people to bring destruction. So the research on the series arc fault of power lines and related electrical equipment, to further implement the protection method can avoid the electric accident caused by series fault arc.In this paper, a series of fault arc simulation experimental study of the load in a variety of state of the current as the characteristic, in this foundation, this paper proposed based on the load in normal working conditions and the series fault arc working conditions waveform difference degree as a diagnostic method-- waveform analysis method. This paper extracted the current signal of the electrical equipment or electrical circuit, and compared the difference between the condition in normal working and the fault condition of the load, and the series fault arc diagnosis is carried out by the treatment of the significant difference between the two waveform.According to the potential interference factors of the fault arc algorithm, the reliability analysis of the waveform analysis method is studied in this paper. Including the change of load current, the sampling time and the change of current frequency and so on. The research and analysis show that the waveform analysis method for the diagnosis of series arc fault can effectively reduce the influence of various interference factors, and the change of current frequency and sampling time can guarantee the accuracy of waveform analysis method, and the variation of load current will not affect the accuracy of waveform analysis method.