电抗式防雷装置对提高输电线路反击耐雷水平的影响分析OA

Research on new lightning protection measures has always been the focus and difficulty in the power industry.In order to improve the lightning protection performance of transmission lines,the author designs a reactance lightning protection device for transmission lines,which is composed of light-ning receiver,reactance element and discharge gap.In order to verify the lightning protection effect,COMSOL software is adopted to establish the finite element calculation model of the inductance coil,and calculate the distribution parameters of the coil according to the lightning current frequency.Secondly,the ATP-EMTP electromagnetic transient simulation software is used to build the lightning transient calculation model of 35 kV transmission line.This model considers the distribution parameters of the reactance device.Finally,the lightning protection effect difference between the device and the inductive lightning rod is compared and analyzed.The influence of the coil inductance size and gap length on the lightning withstand level of the transmission line is studied,and the interturn insulation requirements of the coil are put forward.The reasonable gap structure is designed according to the air gap discharge characteristics.The simulation results show that with the installation of the reactance lightning protection device on the transmission line,the steepness of the mine current into the tower decreases by 63.46％,and the lightning withstand level of the line increases by 13.25％.Moreover,increasing the inductance value of the coil and the gap length can effectively improve the lightning withstand level of the transmis-sion line.