Research On Measurement Method Of Synthetic Electric Field In UHV Transmission Engineering

Compared with the traditional AC transmission technology,UHV DC transmission has the advantages of strong line transmission capacity,low loss,no need for synchronous operation on both sides of the AC system,and small loss to the grid when the fault occurs.In today’s power grid development,possession The pivotal position is the main mode of transportation of electricity from the West to East.The DC electric field and particle flow field under the DC transmission line are one of the important factors affecting the electromagnetic environment near the ground,and also an important basis for judging whether the transmission line is erected.At home and abroad,the calculation method of synthetic electric field is relatively mature.At present,the electric grinder method is used to measure the DC electric field strength.However,the existing DC electric field measuring device still has certain deficiencies and limitations.On the basis of the technical method,the method of chopper measurement is proposed,which provides a new idea for the improvement of the DC electric field strength measuring device.The main contents of this paper are as follows:1.On the basis of literature reading,the calculation methods,advantages and disadvantages of the electric field strength on the surface and space of DC transmission lines at home and abroad are compared and analyzed.2.Through theoretical analysis,the distribution characteristics and laws of the synthetic electric field near the DC transmission line are calculated.At the same time,the electric field distribution around the UHV DC transmission line is simulated by COMSOL Multiphysics software,and the synthesis is 0.2m away from the ground.The electric field strength is simulated and the influence of different types of wire arrangement on the width of the transmission corridor is summarized.3.Waveform correction was performed on the original field-grinding electric field measuring device.By adjusting the shape of the plate of the field-grinding electric field measuring device,the output waveform has the characteristics of sine wave,so as to facilitate subsequent signal amplification and processing,and reduce measurement error.The simulation and simulation calculations were carried out by using COMSOL Multiphysics software.The distortion effect of the field grinding pole on the original electric field to be measured was studied.The influence of the probe on the distortion of the electric field was analyzed.4.A chopper measurement method for DC electric field strength is proposed,and a measuring device is built for experimental research.Overcoming the limitations of existing electro-grinding probes requiring mechanical motion.5.In the conclusion part,the work of the full text is summarized,and the work that needs further research is prospected.