Numerical simulation of voltage distribution of a ±500 kV DC power transmission line divider subjected to an impulse voltage

Based on the field-circuit equivalence concept, a ±500 kV DC power transmission line divider subjected to an impulse voltage is treated as an equivalent circuit, in which the parameters of the mutual capacitance and the mutual inductance are obtained by using the hybrid finite element-analytical approach. The Milne method is used to solve the equivalent circuit, and so the transient voltage distribution along the height direction of the divider is obtained. On the agreement between the computed and the measured results of the voltage distribution of the divider, the selection of shunt-wound lumped capacitance for improving voltage distribution uniformity was studied, and an appropriate selection is suggested.