应用磁环抑制输电线路短波频段无源干扰
[Abstract]:Overhead lines as metal conductors cause electromagnetic scattering of radio signals in space, thus affecting adjacent radio facilities. In order to reduce the influence of overhead transmission line on the receiving effect of radio station operating in short wave band, a method of adding magnetic ring to the peak position of inductive current on overhead transmission line is proposed to restrain the influence of magnetic ring on short wave radio station. The method first calculates the induced current distribution of the actual overhead line under the condition of electromagnetic wave incidence in the radio station, and then installs a magnetic ring at some peak position of the induced current on the overhead transmission line. Thus the influence of overhead lines on passive interference of adjacent radio stations can be suppressed. The effectiveness of this method was verified in the passive interference test conducted at Wuhan UHV AC Test Base. The results show that the effect of using magnetic ring to reduce the electromagnetic scattering effect is related to the impedance characteristic and installation position of the magnetic ring, and the suppression effect is saturated with the increase of the number of magnetic rings. The selection of magnetic ring should consider the working frequency of shortwave emitter or receiving station and select the magnetic ring with high impedance at the working frequency point as far as possible and the position of the maximum inductive current on the line should be selected at the installation position of magnetic ring.
【作者单位】: 中国电力科学研究院电网环境保护国家重点实验室;国家电网公司;华北电力大学新能源电力系统国家重点实验室;国网湖北省电力公司检修公司;
【基金】:国家电网公司科技项目(GY71-16-011)~~
【分类号】:TM75
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