Development Of GIS Particle Defect Online Monitoring System Based On Ultrasonic Method

Gas-insulated Metal-enclosure switchgear(GIS)is widely used in modern power systems due to its many advantages.Insulation failures occur frequently,and in severe cases,the equipment and the power system are safely and reliably operated.GIS equipment will inevitably produce metal particles for various reasons,and the problem of insulation degradation or damage caused by metal particle defects has caused widespread concern and research in the industry.The movement of metal particles is an important problem of metal particle defects.Scholars at home and abroad have studied the motion mechanism,motion characteristics and detection methods of metal particles,but the application of online monitoring technology is insufficient.In order to reduce the insulation failure rate and ensure the safe and reliable operation of GIS,it is urgent to carry out research on metal particle monitoring technology and monitoring system.In this paper,the research on metal particle defect mechanism,system design and simulation experiment verification is carried out,and a set of GIS particle defect online monitoring system based on ultrasonic method is developed.Analyze the mechanism of metal particle defects,and select the overall function and structure of the monitoring system based on ultrasonic method.The mechanism of metal particle generation and its characteristic representation are analyzed.The principle of moving metal particle motion is studied by simulation,and the mechanism and signal characteristics of metal particle motion ultrasonic signal are analyzed.In order to meet the functional technical requirements of the monitoring system for particle defect state monitoring,compared with the commonly used detection methods,the ultrasonic system is selected to design the monitoring system structure composed of the monitoring terminal and the upper computer monitoring software.Design and development of monitoring terminals.In order to realize the functional requirements of the monitoring terminal,the ultrasonic sensor and other hardware devices are selected to construct the monitoring terminal.The FPGA-based control program design was selected,and the Verilog language was used to design and control the control program for high-speed sampling,data buffering,and high-speed data communication transmission monitoring terminals.Design and development of PC monitoring software.Develop an Ethernet communication protocol based on UDP user datagram to realize data intercommunication between the host computer and the monitoring terminal;design an abnormal signal judgment,a particle defect type judgment,and a judgment index and algorithm for the degree of damage of the moving particle.Design the management function of the host computer database,responsible for managing the measured data and defect statistics.Use C#language to design and develop data communication,data processing,database management and data visualization interactive interface of PC software monitoring software.Simulation experiments verify the effectiveness and reliability of the monitoring system.The reliability of high-speed data transmission of Ethernet high-speed data and the good performance of the system were tested.The experimental platform of simulated metal particle motion was established to simulate the particle collision defect signal,and the online monitoring function and off-line analysis function of the monitoring system were verified.