Numerical Prediction of EMI on the Secondary DC Cable in Cable Tunnel Due to a Direct Lightning Strike in Substation

摘要

In this paper, considering the location at infinity under the earth surface to be the zero-voltage reference point, the multi-conductor transmission lines (MTLs) theory is applied to model the secondary DC cable system in substation. Based on the FEM, the cable tunnel can be taken into account. As a result, both the current flowing in the cable shield and the transverse voltage between the cable core and the cable shield can be obtained. The results show that the injection position of the lightning current has great effect on the transient electromagnetic interference on the secondary cable.