Passive Interference In Transmitting Stations Of Medium Wave AM Broadcasting Caused By 110kV HVAC Power Lines

High voltage AC power line is actually a very complex and huge system. With the steady development of the country's economic construction,the demand for energy is growing.In recent years,the scale of power grids increase continuously,high voltage,ultra high voltage power lines are also gradually increased.These high-voltage power lines are powerful driving force for the development of modern industry. However,high-voltage AC power lines will cause electromagnetic interference on the environment or other equipment which they pass by,and then it becomes a new source of pollution.Therefore,the research work on high-voltage power lines will greatly enhance the efficiency of interference prevention,and make sure that the establishment of protective method is more reliable,credible and accurate.In this paper,the passive interference in transmitting stations of broadcasting is analyzed thoroughly basing on the analysis of high-voltage power lines interference. Moment method numerical analysis software and real-size modeling are used in this paper,to verify the passive interference from high voltage power lines in the medium wave AM broadcasting is mainly caused by power towers and sky wires.Simulation results show that the effect of passive interference is connected with the number of high-voltage towers,and the distance from the antenna,the direction of high-voltage power lines and the like such factors.The changes in Broadcast stations topography,as well as the actual impact from high-voltage power lines and terrain on transmitting stations are researched and analyzed according to the actual situation of Mudanjiang transmitting stations.The main factor of passive interference from the high-voltage power lines is identified,and the far field patterns of the antenna under different conditions are discussed in this paper.A better simulation model of high voltage power lines for solving the practical problems is obtained from the calculation result,and a solid foundation is laid for the further research of passive interference in different high-voltage power lines voltage levels.