Study On Distribution Of Ground Potential And Stride Voltage Around Grounding Device Of Transmission Tower

With the rapid development of the social economy,the scale of the power grid construction in China is increasing.In 2009,the national grid has proposed the strategic layout of the construction of the UHV power grid and the coordinated development of the power grid at all levels.Nowadays,the urbanization of our country is becoming more and more rapid,and some remote areas in the past are gradually becoming densely populated urban areas.With the expansion of the power grid scale,the number of transmission lines and towers will increase,and the distribution of poles and towers will become increasingly dense,even in areas with densely populated areas,there will be More and more transmission towers pass through.When grounding faults occur in the lightning transmission line or transmission line,the fault current will be discharged into the earth through the pole tower.Because of the high amplitude of the fault current,it may cause a sharp rise in the ground potential around the transmission tower,which may lead to a dangerous span of the human body around the tower.Step voltage and contact voltage lead to personal safety accidents.Therefore,the distribution of the ground potential and the stride voltage around the transmission tower earthing device should be analyzed,and the corresponding safety measures should be taken to ensure the safety of the surrounding people.In this paper,the basic requirements of the current transmission pole and tower grounding device,as well as the common type and structure are analyzed,and the influence of the depth of the grounding device and the soil resistivity on the distribution of the surrounding potential is studied.With the simulation experiment of true value simulation experiment network and the simulation analysis of CDEGS simulation software,the distribution of the ground potential and the stride voltage of different types of grounding devices under different types of current are obtained,and the maximum striding voltage locus envelope around the grounding device of transmission towers with different shapes is obtained.Cloth situation.According to the distribution of the cross step voltage around the different shape grounding devices obtained by the laboratory simulation experiment and the CDEGS simulation,the harm of the cross step voltage around the different shape grounding devices is obtained,and the different shape grounding devices are compared and analyzed.In the end,according to the distribution law of the maximum striding voltage track envelope around the grounding device with different shapes,the security situation around it is evaluated and the corresponding safety protection measures are taken.