500kV同塔4回线路无线电干扰和工频电场

Radio Interference and Electric Field of 500kV Four Circuits on One Tower Transmission Line

针对输电线路走廊问题,计算了500kV同塔4回架空线路2种塔型6种导线排列方式的无线电干扰、地面电场分布及线路下方满足4kV/m电场位置与边导线间的距离,并与典型单回500kV线路进行了比较。计算分析表明:500kV同塔4回线路无线电干扰水平均能满足我国<55 dB的限值标准;合理布置导线,500kV同塔4回线下场强可控制到小于500kV单回线下的水平;从线路无线电干扰和工频电场影响考虑,与500kV单回线路相比,同塔4回架设并不会进一步恶化线下的电磁环境。

With the high speed development of the electric engineering in our country, the electric grid become more and more compact, the right way of power transmission line and the used area become important problems to the power transmission line constructing. The radio interference, electric-field, magnetic field and audio noise are the main electro-magnetic environment parameters for high and extra high voltage transmission line, however, in the design of 500 kV AC transmission line, the radio interference and electric field is the most important. This paper calculates the radio interference and electric field of 500 kV four circuits on one tower transmission line for two towers and six kinds of conductor arranging, and the distance between 4 kV/m electric field location and edged conductor, and compares the calculated results with 500 kV single circuit line. The design department affords two kinds of tower named d and e. According to the tower, 6 kinds of arrangement of conductor are calculated. The parameters of conductor follow LGJ-400/35. The calculating minimum height is considered as 14m and 11m. As a result, the radio interference of 500 kV four circuits on one tower transmission line is less than 55 dB（μV/m）, the ground electric field can he controlled under ＂the level of 500 kV single circuit line. 500 kV four circuits on one tower transmission line can not aggravate the electro-magnetic environment compared the 500 kV single line.