| With the rapid development of distribution technology,live operation has become the development trend of distribution network work,but this mode of operation also to the power distribution site personnel personal safety has brought some risks.The traditional power distribution operation site safety early warning measures is to take high-voltage charged around the installation of safety fence,suspension warning signs,installation of high-voltage live indicator,full-time monitoring and other protective measures,these methods are passive alarm,alarm unreliable and other shortcomings,to not meet the current distribution operations on-site security warning real-time and accuracy of the demand.This paper mainly completes the work.Based on the analysis of the typical scene of the distribution operation site,the electric field safety warning value of the high pressure danger zone is calculated by the mathematical modeling and simulation.Combining with the existing electric field sensor technology and information processing technology,this paper has developed a dynamic monitoring,And the use of electric field limit of the early warning way to determine the safety of workers and high-voltage charged body of the early warning equipment,so that the distribution operations staff can safely and successfully complete the distribution operations,thereby reducing the occurrence of security incidents.The paper mainly accomplishes the following work.1.The electric field model of high voltage transmission line is simulated in the typical scene of power distribution operation.Based on the analysis of the typical transmission model of high voltage transmission line,the high voltage transmission line model is divided into,electric field simulation model of infinite high voltage transmission line and electric field simulation model of wired long high voltage transmission line.According to the Maxwell equations and boundary conditions,the distribution of the frequency domain of the high voltage transmission line is calculated by the simulated charge method and the simulated charge method,and the comparison experiment of the field measurement and the electric field simulation data is carried out.The experimental results show that the method can effectively simulate the field intensity distribution in the surrounding space of the high voltage transmission line,and provide accurate data support for the early warning value of the electric field in the high pressure area.2.The development of early warning equipment.The early warning equipment is divided into hardware part and software part.The hardware part mainly includes three parts,electric field sensor module,signal processing module and main processor module.The sensor uses the German ME3030B power frequency electric field strength detector electric field probe,carries on the frequency electric field signal gathering.The main processor uses STM32 high-capacity processing chip as the core control device,the signal processing and sound and light alarm control.The software part takes Keil4 as the development platform,and realizes the functions of analog to digital conversion,liquid crystal display,data processing,electric field over limit alarm.The results show that the designed early warning equipment can not only monitor the electric field intensity of the distribution workers in real-time during the distribution operation,but also keep the sound and light alarm in time limit,and the warning accuracy is high,Stable work,to meet the power distribution site safety warning needs. |
