Electric Field distribution on four-bundle conductors in 750 kV AC substation

In high altitude areas of northwest China, the corona activity of conductors is serious in 750 kV AC substations, which may lead to severe electromagnetic environmental problems. According to the research and field experience, determination of adequate parameters of conductors is intended to solve these problems. In this paper, the critical E-Field value is obtained by Peek´s empirical formula and this provides a reference for the optimization. Using a three-dimensional FEM model, factors that affect the E-Field distribution on four-bundle conductors are discussed and recommendations on diameter and bundle spacing are obtained. The optimization can result in reduction of the corona discharge on the conductors. The derived conclusions can provide experiences and references for the design of conductors in 750 kV AC substation.