科研之友
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摘要
In order to investigate the power frequency electromagnetic field distribution of transmission line crossed in space, a three-dimensional electromagnetic field calculation model of three-phase cross-wire was established according to the catenary equation and considering conductor sag and tower. Based on the charge simulation method, the power frequency electrical field below the cross-wire was calculated, utilizing linear finite slant line charges to simulate the axial charge distribution in wire. Based on the Biot-Savart theorem, the power frequency magnetic field below the cross-wire was calculated by finite thin current-carrying wire model. Meanwhile, the influence law of crossing angle and line-phase on field distribution was discussed. The calculation results show that the electromagnetic field below the cross-wire decreases with the crossing angle getting larger, and the field distribution changes with line-phase altered; the maximum electrical field occurs near the projection of the same phase cross-wire intersection, and the maximum magnetic field occurs near the projection of the intersection of middle phase of the top wire and side phase of the lower wire. Besides, the wire at the bottom plays a shield wire role in electrical field, however, for magnetic field, the role is related with crossing angle. In the end, the electromagnetic field is surveyed on the spots for two typical crossed wires in YinChuan area, and the availability of the algorithm is validated.
- 出版日期2011
