Research On Electromagnetic Radiation In The Scenario Of Sharing Construction Of High Voltage Transmission Tower And Mobile Base Station

At present,the rapid development and wide application of wireless communication technology are constantly changing people's life and work style.Therefore,in the future,the number and density of base stations will be more and more large.How to reduce the operating cost has become an urgent problem for operators.The sharing construction of high voltage transmission tower and mobile base station which adds the function of communication base station to the existing transmission line tower is becoming a new resource sharing mode.The traditional environment around the high voltage transmission tower has added a high-power microwave radiation source,which brings new radiation problems to the daily operation and inspection work around the transmission line tower.Therefore,the safety of operation and inspection can only be guaranteed if the electromagnetic distribution characteristics in the scene are fully understood.It is necessary to further study the electromagnetic radiation in the scenario of sharing construction scheme of high voltage transmission tower and mobile base station.The main work of this paper is as follows:1)Based on the calibrated electromagnetic field measurement system,the field measurement is carried out for 35 k V,110 k V and 220 k V towers of different voltage levels.Based on the test data,the horizontal area around the transmission tower,the area under the antenna inside the tower in vertical direction,the area behind the antenna,the area above the antenna,the area under the antenna outside the tower and the front area of the antenna are studied According to the proposed rules,the above physical areas are divided into strong,medium and weak field areas,which provides reference for the coverage area and installation interval of base station.2)The specific absorption ratio(SAR)is used to evaluate the human exposure in the scene of the sharing construction scheme of high voltage transmission tower and mobile base station.Based on the data,the SAR values in the ground area of 35 k V,110 k V and 220 k V sharing construction of high voltage transmission tower and mobile base station and the inside and outside area of the tower in the vertical direction are calculated.The analysis results show that when there is side lobe radiation on the back of the tower,the SAR value in this area will exceed the limit value,and the SAR in the front and upper area of the antenna outside the vertical direction tower far exceeds the limit value,while the SAR in other areas is far below the limit value.On this basis,the electromagnetic radiation protection measures of distance protection and personal protection are proposed to provide safety guarantee and parameter reference for the operation and inspection personnel in daily operation,and avoid or reduce the impact of electromagnetic radiation on the operation and inspection personnel.