Research on calculation method of space electric field around paralleled double-circuit lines and effects of phasing arrangements

The transmission form of two-circuit lines on the same tower has been increasingly widely used in the actual power grid. With the increase of wires, the space electric field of transmission lines becomes more and more complex. Research shows that the space electric field of transmission lines will be affected by many factors, such as tower structure, wire properties and phase sequence arrangement. First, this paper expounded the tower structure and phase sequence arrangement of common two-circuit lines on the same tower. Then the paper gave the detailed modeling and computing methods of space electric field, and combined with this method to carry out a simulation analysis on 330kV two-circuit lines on the same tower in the northwest power grid. Here comes the conclusion, the intensity of space electric field is not the same when using different phase sequence arrangement for the same two-circuit lines on the same tower. Besides, the paper also gave some measures and suggestions on space electric field environment optimization on this basis.