Design And Implementation Of Distributed GIS Distribution Room Gas Safety Monitoring System

In recent years,the continuous promotion of modernization has led to a growing demand for electricity and the rapid development of the electric power industry,with a large number of gasinsulated switchgear being put into use.Gas-insulated switchgear with sulfur hexafluoride gas as the internal insulation medium is prone to sulfur hexafluoride gas leakage during manufacturing and operation,posing a threat to human life and causing environmental pollution.At the same time,equipment failures caused by gas leakage can lead to different degrees of economic losses.Based on this background,a distributed GIS(Gas Insulated Switchgear)distribution room gas safety monitoring system is designed in order to monitor the concentration of sulfur hexafluoride in the distribution room of gas-insulated switchgear in real time,to realize timely alarm when the concentration is abnormal,and to prevent the occurrence of dangerous accidents.The main work of the thesis is as follows:(1)Determine the overall scheme of the system.By studying the development status of the field of sulfur hexafluoride gas monitoring in GIS distribution rooms at home and abroad,the overall design scheme of the system is determined.The system uses infrared spectral absorption to collect sulfur hexafluoride gas,ensuring the efficiency and quality of data collection without increasing the complexity of the equipment.The system is networked through wireless communication to adapt to the dense cable and high-voltage dense area inside the distribution room.Lo Ra technology is selected to enhance the network scale and overcome the shortcomings of traditional manual meter reading and monitoring in terms of real-time,monitoring efficiency and data recording.The system adopts distributed storage solution to avoid the problem of paralysis of data storage and query function caused by the conventional clustered storage online monitoring solution in case of server failure.(2)System hardware circuit design.A monitoring node based on PIC32 microcontroller control circuit and a field gateway based on IMX6 ULL core board and peripheral backplane are designed to realize the hardware basis of the distributed and modular design of the system.(3)System software design.The software of monitoring node data acquisition and RF communication tasks,the software modules such as task execution framework,task cache pool,and device management module of the field gateway,and the service software of the cloud server based on Springboot framework are designed to realize the basic functions of distribution room environment monitoring and distributed data storage.Secondly,the adaptive access method of monitoring nodes and field gateways is designed to improve the networking efficiency during system installation.Meanwhile,the human-computer interaction interface based on Qt of the field gateway is designed to provide two display style interfaces to realize the real-time visualization of system monitoring data.(4)Further,the configuration terminal of the We Chat Mini-Program and the configuration cache group policy are designed.The We Chat Mini-Program enhances the portability of the configuration terminal and the transferability of the program to meet the needs of parameter configuration at a later stage of the system.The configuration cache group policy overcomes the problems of low efficiency and misoperation of the traditional device-by-device configuration of parameters by means of global setting parameters sent down from the gateway.(5)The operation of the designed distributed GIS distribution room gas safety monitoring system was verified through both hardware and software tests,and the results showed that: all basic functions of the system can operate normally;the communication distance between the monitoring nodes and the field gateway can reach 100 meters with good stability;the server has a throughput of456.81 requests per second under the stress test.