Design Of 35 KV Substation Monitoring System

Substation is the link of transforming current and voltage and completing power distribution in power system.In order to ensure the safe and reliable operation of various substations,the substation electrical system has basically realized automatic control and operation,but manual participation is still required in operation and maintenance,and unattended operation is not realized.Aiming at this problem,this thesis aims to design an unattended substation monitoring system integrating control,protection,monitoring and communication functions.Based on the three-tier architecture of the existing system,a four-tier monitoring system based on the perception layer,network layer,platform layer and application layer of the Internet of things platform is developed to realize the three-dimensional and all-round monitoring of the substation.The main research work is summarized as follows:(1)The overall structure of 35 k V substation monitoring system is designed.By analyzing the design requirements of 35 k V substation monitoring system in terms of electric energy parameters,switching state,temperature,fire prevention and disaster resistance,audio,vibration,image acquisition,communication network,field operation control and remote control,the overall structure of the monitoring system composed of substation monitoring terminal,Wi Fi / 5G network,Internet of things cloud platform and user center is proposed.(2)The processing method of main monitoring data of 35 k V substation monitoring system is proposed.The preprocessing process required by the basic methods of data acquisition,processing,correction and display of 35 k V substation monitoring system is given,the alarm threshold in case of abnormal system monitoring indicators is determined,the fault tree of 35 k V substation monitoring system is constructed by using fault tree theory,and the benchmark information classification alarm method is proposed.(3)The hardware and software system of 35 k V substation monitoring terminal are designed.By analyzing the signal parameters and functions to be detected,the monitoring terminal circuit,control unit circuit,power parameter measurement circuit,switch circuit and speech recognition circuit,network communication circuit,sensor circuit and field interactive control circuit are designed.The monitoring software is designed by introducing C language into keil uvison5 development environment,and the software of remote monitoring center is designed by using One Net Internet of things cloud platform.