Research Of Fast Fault Location Technology For Distribution Network In Jiyang District

The resonant grounding system is the main power distribution system in China.After single-phase grounding,fault transient signals often have insufficient collection,poor anti-interference ability,too little judgment basis,and poor signal synchronization quality.With the development of cutting-edge power grid technology,the fault and location functions of traditional distribution networks can no longer adapt to the development of modern distribution networks.Traditional distribution network protection systems have various situations such as misoperation and refusal to operate.The accuracy of the fault level selection and positioning mechanism is not high,the blind zone is large,and the actual application effect is not good.ideal.Therefore,there is an urgent need for more reliable routing and location strategies at this stage.In addition,the vast majority of home power distribution systems have been using online fault location equipment.Therefore,research on a fast,reliable,and practical single-phase ground fault location system is of great significance to the optimal operation of the distribution network,fault isolation and improvement of power supply reliability.This thesis aims at the research of fault location.In the substation,a 10kV protection device with transient principle is used,and the high-frequency and high-amplitude transient current signal in the initial stage of the ground fault is used to accurately determine the grounding line;outside the substation,One and two deep fusion switches are installed on the distribution lines,which have transient characteristic signals and transient recording functions to realize the judgment of the ground fault on the load side,and upload the alarm signals and recording waveforms to the main station.The master station integrates the judgment results of the line selection device in the station and the switch outside the station.After comprehensive analysis,the fault section is given to realize automatic isolation or an isolation strategy to achieve the purpose of accurate line selection inside the station and accurate section selection outside the station,and improve the reliability of power supply.