Research On Induction Electricity And Protective Measures For Maintenance Work Of 1000kV Double-circuit Transmission Lines On The Same Tower

With the expansion of the scale of the transmission network,the available overhead line corridor resources have decreased,and the electromagnetic coupling problem caused by the erection of lines has become increasingly prominent.In the daily operation and maintenance of UHV parallel transmission lines,long-distance non-live working lines is parallel to live transmission lines.The operating lines are in a complex electromagnetic environment and face serious induction problems,the induced electricity generated during normal operation and maintenance of transmission lines or one-time operation and one-time maintenance of double-circuit transmission lines on the same tower will threaten the safety of operators.Therefore,it is necessary to conduct research and analysis on the induced electricity of transmission lines to further protect the safety of maintenance workers.This paper first use the analog charge method to calculate the surface power frequency electric field under the line,analyze the influence of various factors on the electric field,at the same time,study and analyze the effect of erecting shielding wires with different heights,lateral positions,and numbers of shielding wires and shielding nets with different numbers of grids on suppress the surface power frequency electric field under high-voltage transmission lines.Then,aiming at the problem of induced electricity on the maintenance line,this paper uses the CDEGS software calculates and analyzes the influence of various factors on the induced current on the ground wire,and proposes a more reliable and safe grounding by summarizing the characteristics of induced currents under different grounding schemes;Aiming at the problem of electric field intensity on the surface of maintenance workers,the human body,circuit and tower models established by ANSYS finite element software are used to calculate the electric field strength of the human body when the maintenance personnel perform live work on poles,cross arms,insulators and fittings,wires,and grounding devices.The electric field protection measures for various maintenance items of the power transmission line are summarized,and finally,a method of correcting the results through distortion factors is proposed for the problem of false alarms of electric field early warning devices.The research content of this article can provide a corresponding basis for the protection of 1000 kV transmission lines induced electricity,and is of great significance to ensure the safety overhaul of 1000 kV transmission lines.