Research On Single Phase Grounding Fault Monitoring Method For Small Current System

In the entire power system,the distribution network is the last environment before connecting users.Once a fault occurs in this link,it will directly affect the users at the back end.Therefore,ensuring the stable operation of the distribution network directly affects the user's power quality.In the early stage,the fault location of the distribution network is manually inspected,and the efficiency is very low.With the development of science and technology,more and more electrical equipment is used,which poses a greater challenge to the power supply system.In this paper,the fault detection of distribution network in some relatively remote areas is still using the manual inspection method,and the problem of the overall automation level of the power grid is improved.By reading a large number of domestic and foreign references,looking up various technical materials,understanding the current state of technology development at home and abroad and some excellent testing methods,design a set of online fault monitoring system for distribution network.Study the advantages and disadvantages of various algorithms.According to the actual development status and actual needs of China's distribution network,the signal injection method is used to detect the fault location.In this paper,the signal injection method is deeply studied theoretically.The principle of signal injection method,signal injection method and specific positioning formula of fault area are introduced in detail.The detailed software and hardware structure of online fault monitoring of distribution network is designed.In hardware,the hardware structure of fault indicator,substation GSM communication system and signal injection device are mainly described.In terms of software,the topology circuit diagram of the distribution network is constructed.Based on the GIS development of MapObjects component,the fault location algorithm of signal injection method is further improved.Finally,the overall experimental process and the results obtained are introduced to verify the scientific nature of the entire design system.The paper has 38 pictures,2 tables,and 50 references.