Research on calculation of electric field within substations using CSM

Distribution of conductors in a substation is complex, usually the span and sag of two sets of jointed conductors are different. Traditional charge simulation method (CSM) calculate the electric field using lumped parameter, with the hypothesis that the span and sag of two sets of conductors jointed together are equal, which lead to the electric field obtained where conductors are joint to be discontinuous. The paper proposes an electric field model, the model improves CSM using distributed parameter, it calculate electric field according to the difference of span and sag of two sets of conductors which are jointed together, it can calculate the electric field in a substation more accurately, and continuous, smooth electric field is obtained. The method can be applied to calculating electric fields under various conductor arrangements. Advantages of the method are proved by simulation in Matlab.