Simulation And Verification Of Electrical Parameters Of Communication Base Station Tower Under Lightning Strike

Lightning pulses have a significant negative impact on the stable operation of communication base stations.The precise electrical parameters of communication towers under the action of lightning strikes are an important electrical parameter basis for the analysis of lightning resistance levels of communication base station towers of pole towers.The formulation is of theoretical significance.Based on the electromagnetic field finite element principle,the model was established using the actual tower parameters of the communication base station,and the electrical parameters of the towers of the communication base station were simulated and calculated.According to the connection characteristics of iron tower components,considering different specifications and locations,finite element simulation analysis was performed on the self-inductance of the angle steel tower and the mutual inductance between the components,and the experimental results were verified by the simulation results.The self-inductance parameters and mutual inductance parameters of unit lengths of different specifications and different angle steel components,as well as the self-inductance parameters of the tower under different internal structure conditions are obtained,and the law of the tower inductance parameters is further analyzed through simulation.The agreement between the finite element method and the experimental results verifies the correctness of the finite element method.Based on the simulation calculation results,a lightning current circuit model,a base station tower circuit model,and a coupling circuit modelbetween the base station tower and the power cable are established,and the current distribution characteristics of the inside of the tower and the tower grounding system are simulated.The results of finite element simulation combined with experimental verification show that within the range of lightning current frequency of 10kHz-50 kHz,the inductance value of angle steel components changes slightly;at a fixed lightning current frequency,material conductivity,and magnetic permeability,the self-inductance value and The length is proportional to the mutual inductance of two parallel angle steel components and the spacing is inversely proportional;the structure of the cross bar in a single-layer tower has a weak effect on the self-inductance parameter of the tower,and the oblique pole structure is omitted,the self-inductance value of the tower is significantly increased.The tower type can save the modeling of the inclined rod and modify the inductance.The circuit simulation results show that the current distribution of the internal structure of the tower under the action of the lightning strike is determined by the inductance of the component itself and the connection relationship.There is no current distribution on most crossbars.,The current distribution of the main pole and the inclined pole decreases gradually from top to bottom,and shows a partially symmetrical distribution relationship in each layer.In the communication tower grounding system composed of lightning rods,triangle towers,and power cables,the tower body and The current distribution ratio of each core of the three-core AC power supply cable is 12.3:1:1:1,and most of the lightning current is discharged through the tower body.