Study On Electric Field Simulation Of 220 KV Typical Tower Living Working

In recent years,with the rapid development of China's power grid and the constant improvement of the level of charged operation,live working of transmission line has become one of the important technical means of operation maintenance and repair work of transmission line,which has played an important role on improving the safety and reliability of the power grid operation and economic benefit.It can ensure the elimination treatment with the transmission line without power cut,which is the most direct and effective means of transmission line maintenance,however,at present,most of the live working project maintenance needs people to work into the equal potential working,so in what way the staffs work has a significant influence on their own security.First of all,we take the 220kV glass tower,strain tower and double circuit trans mission line towers as the object.Secondly,The finite element simulation software of ANSYS was used to simulate the specific field strength values of the key parts of the surface of the human body,when the live operator is on the wire through the 220k V glass tower,strain tower and the double-circuit transmission line of the same tower.At the same time,when the 220 kV glass tower edge phase field respectively use the methods of insulation gangway or hanging basket and the middle phase field use the methods of hanging basket to enter the equal potential,with 220kV strain tower using basket method and 220kV double-circuit transmission lines on the same tower respecti-vely using insulation ladder method and soft ladder method,the field strength around the living worker was simulated.Through the analysis,it can be seen that the surface strength of the human body is "U" type distribution,and the maximum field strength of the body appears in the feet,within the perceptual limit of the human body to the electric field 240kV/m.So wearing ordinary shields can meet the requirements.The last but not least,when the 220kV glass tower edge phase field respectively use the methods of insulation gangway or hanging basket and the middle phase field use the methods of hanging basket to enter the equal potential,with220kVstrain tower using basket method and 220kV double-circuit transmission lines on the same tower respectively using insulation ladder method and soft ladder method,the specific path of the live worker was analyzed,Simulating the each point of the field strength value of the people.It can be seen that,to the 220kVglass tower edge phase,the four-point average field strength of the hanging basket method is slightly lower than that of the insulation gangway method.So the hanging basket method for entering the equal po-tential was chosen,as the same of the 220 kV glass tower middle phase and the 220kV strain tower.To the 220kV double-circuit transmission lines on the same tower,the four-point average field strength of the insulation ladder method is slightly lowe r than that of the soft ladder method.So the insulation ladder method for entering the equal potential was chosen.The results provide a reference for 220kV live operati-on.