Research On Direction Estimation Device Of Electric Field Source Based On Rotating Magnetic Field

A safe and stable power supply is particularly important to ensure the normal order of production and life,and is the main goal of power grid construction.At present,during the operation and maintenance of power facilities,electric shock accidents often occur due to equipment failure or misoperation.Existing electrical measurement devices on the market can detect the surrounding electric field source,and cannot monitor the electric field source in real time.It is difficult to identify the approximate location of the field source.In electric power work places with complex on-site environment,the danger cannot be eliminated in time.This paper takes the rotating magnetic field and part of the capacitance theory technology as the core,and proposes a real-time monitoring device for estimating the position of the non-contact electric field source.The work completed in this paper mainly includes the following aspects:(1)On the basis of a large number of domestic and foreign literature research and market research,the advantages and disadvantages of the existing electroscope and non-contact electric field measurement system,as well as the existing problems in the existing electric field measurement device,are comprehensively analyzed.(2)Based on the classical electromagnetic field theory,the finite element method is selected as the numerical analysis method of electric field,and the model of highvoltage single-circuit transmission line and mains cable is established.The finite element analysis software COMSOL Multiphysics is used to simulate the electric field distribution of the transmission line under the transient and steady state.(3)A new method for detecting the position of the electric field source using rotating magnetic field and partial capacitance theory is proposed.(4)The method of demodulating AM wave signal with software phase-sensitive detection and dichotomy is described,and the simulation verification is carried out.(5)The hardware part of the non-contact electric field source position detection system is designed,and the design of the minimum system of the single-chip microcomputer,the signal conditioning circuit and the human-computer interaction module are completed.(6)The software design of the detection device has been completed,including:software programming related to the generation of rotating magnetic field;signal reception and storage;software phase-sensitive detection and dichotomy processing data related programs.(7)Using the non-contact electric field source azimuth estimation device to actually measure the mains cable,it verifies the correctness of the detection method and the accuracy of the designed device.In summary,the non-contact electric field source position estimation device designed and studied in this paper has the characteristics of flexible use,portability,low cost,and strong anti-interference ability.Not only can it monitor whether there is an electric field source around it in real time and remind the operator to stay away in time,but it can also prompt the approximate location of the electric field source,which can greatly reduce the occurrence of electric shock accidents.The design strategy and the implemented device have certain theoretical significance and engineering application value.