1000kV特高压交流输电线路工频磁场分析

通过建立特高压交流输电线路空间工频磁场的时域数学预测模型,有效简化了复域模型求解的繁琐过程。利用所建立的预测模型分析了我国特高压交流输电线路产生的工频磁场的横向分布规律,以便在出现最大磁场感应强度的地方做好屏蔽工作。从控制工频磁场的角度出发,定量研究了线路负荷电流大小、导线对地高度、单回路时的导线布置形式和双回路时的相序布置方式等主要因素的影响程度,为工程设计人员提供更为直观的参考和借鉴。

Study of a power frequency magnetic field of 1 000 kV UHV AC transmission lines

The time-domain mathematical prediction model of a space frequency magnetic field of UHV AC transmission line was established, which simplified the tedious process of the model in the complex domain. The horizontal distribution of the power fre-queucy magnetic field of UHV AC transmission line in our country was analyzed based on the prediction model, so that the maxi-mtun intensity of magnetic induction would be well shielded. In order to control the power frequency magnetic field, the size of the line load current, the height of wire from the ground, the conductor configuration of single-loop and the phase sequence ar-rangement of the double loop were studied in the fixed quantity. The results provided a more intuitionistic reference and learning for engineering designers.