500 kV同塔双回线路感应电压和电流的仿真与研究

Emulation and study of induced voltage and current for 500 kV double-circuit line on same tower

同塔双回输电线路因其可提高输电走廊利用效率和输送容量大等特点在工程中日益得到广泛应用,双回线路在一回线路运行、一回线路检修情况下产生的静电和电磁的耦合对检修线路上的工作等有较大影响,文中介绍了利用PSCAD/EMTDC电磁暂态计算程序结合实际运行线路实例对500 kV同塔双回不换位输电线路静电感应和电磁感应的电压和电流进行的较详细的计算,对计算的数据用表格和图表作出比较,分析感应电压和电流在不同线路负荷及线路长度下的变化以及影响感应电压和电流的因素,为同塔双回线路的检修及带电作业等方面的工作提供参照依据。

Double-circuit line on same tower is widely applied in project due to its greater transmission capacity and its ability to increase the efficiency of transmission corridor. During the operation of double-circuit line non-transposition on same tower, there is static electric induction and electromagnetic induction on transmission lines. In this paper, with the help of the electromagnetic transient computation procedure, an elaborate research has been carried on the static electric induction as well as electromagnetic induced voltage and current on the 500kV double-circuit lines on same tower. The data are compared by means of tables and figures. An analysis is made about change of induced voltage and current influenced by load of operating line and the length of the line and other factors that influence induced voltage and current. This current paper will be helpful in many aspects of dou- ble-circuit line on same tower such as the maintenance and hot-line work.