Research And Application Of On-line Monitoring System For Zhanjiang Distribution Line Faults

The distribution network is the carrier of urban and rural power supply.The stability and security of the distribution network is directly related to the power supply security of thousands of households and has important economic and social significance.Under the current situation,after the fault of the distribution network,it is necessary to rely on the manual inspection line to find the fault point.The time spent searching for the fault point greatly exceeds the time taken to repair the fault,which increases the loss of the power load and easily causes the accident to expand.This thesis analyzes and studies the fault online monitoring system of Zhanjiang distribution line for the Zhanjiang distribution network line.The main research contents are as follows:Firstly,this thesis analyzes the background and significance of the topic selection,and summarizes the development status of the fault online monitoring system of distribution lines,and introduces the application status of Zhanjiang distribution line and fault monitoring system;Secondly,detailed analysis on the basic principle of short-circuit fault monitoring and positioning of distribution network,single-phase ground fault theory and ground fault monitoring method,phase-to-phase,single-phase and fault judgment logic,and different types of distribution lines: radioactive lines And the fault location method of the power supply line is studied.Third: Designed an online monitoring system for distribution lines.Firstly,according to the operating state of the distribution line,the open design is adopted,the interface is reserved,and the principle of compatibility is improved.The structure of the online monitoring system,the data transmission substation,the data transmission center station,and the monitoring main station system are analyzed and designed.At the same time,in the design of the communication network,the communication host uses the SMS method to communicate with the system main station and access the Internet through the GPRS mobile network.The offline temperature measurement and single point temperature measurement mode of SMS different from traditional temperature measurement scheme are analyzed.The terminal power supply scheme and two-point temperature measurement monitoring scheme which can improve the reliability of power supply are proposed and analyzed.Fourth: Analysis and experiment on the reliability of the distribution line online monitoring system.From the three aspects of hardware,installation security and software,the design of improving the reliability of power supply is proposed.The Zhanjiang Chikan PowerSupply Bureau was selected as a pilot,summarizing the construction experience and forming a typical design.Fifth: Analyze the application of the designed on-line monitoring system for distribution lines.The system has been successfully promoted and applied in Zhanjiang area,which not only effectively improves the repair efficiency of distribution network,but also forms objective economic benefits.It also provides valuable practice for Guangdong Power Grid to solve the online monitoring and construction of distribution network in blind distribution and heavy corrosion of distribution network.experience.