Arc Fault Location System In Low Voltage Distribution Network Environment

According to the "2021 National Fire Rescue Team’s Announcement of Police Responses and Fire Situations" report released by the Ministry of Emergency Management,it is clearly pointed out that in 2021,my country has happened a total of 748,000 fire accidents,of which electrical fire accidents account for 28.4% of all fire accidents in the year.The electrical fire protection situation in residential buildings is severe.High temperatures caused by arc fault are a major cause of electrical fires.Therefore,it is very important to find a method that can quickly locate the arc fault,and to design and manufacture the equipment for locating the arc fault,which is of great significance for preventing electrical fires.First,this paper introduces the development and research status of cable fault location.By analyzing the characteristics of the resistance of the arc fault,the principle of reflection and refraction of the traveling wave at the impedance mismatch in the transmission of the cable,and the SSTDR technology based on the principle of the traveling wave reflection at the impedance mismatch to locate the fault.The conclusion is that arc fault will lead to impedance mismatch.The impedance mismatch caused by arc fault,which will cause traveling wave reflection.Therefore,the Spread Spectrum Time Delay Reflectometry can be used to locate the arc fault.Secondly,through simulation research and analysis,the transmission signal suitable for arc fault location in low-voltage distribution network and the model suitable for simulating arc fault in low-voltage distribution network are selected.Then,it is proved that the SSTDR method can be used to locate the arc fault through a complete simulation experiment of arc fault location.Then,the filter and related algorithms for arc fault location are verified by simulation experiments with added noise,which improves the anti noise performance of the arc fault location algorithm.Finally,this paper designs and manufactures an arc fault location system based on Field Programmable Gate Array.The system has two working modes.The first working mode is the data acquisition mode,which is used to collect the data of arc fault location and make the collected data into a data set.According to the actual data set,the arc fault location simulation system is improved,so that the simulation can more accurately simulate the actual situation.The second working mode is arc fault location,which is used to locate arc fault.After the actual verification,the arc fault location system equipment designed and manufactured in this paper can locate the arc fault,and the location error rate is within 4.25%.