Parameters that influence the crosstalk in multiconductor transmission line

Transient surges in one of the overhead conductors, due to direct lightning strike, causes crosstalk (interference) in other adjacent conductors. It´s a common phenomenon observed in power lines, communication lines and electrified railway lines. In this paper we investigate the crosstalk in multi-conductor transmission lines (MTLs) above finitely conducting ground as a function of ground conductivity, height of the receptor conductor, position of emitter source and the terminal loads. It is shown that ground conductivity has a significant influence in the amplitude and wave shape of the crosstalk currents in MTLs, which has not received sufficient attention earlier. In general finite ground conductivity increases the crosstalk current magnitudes in the receptor circuit loads both at the near end and far end. There are situations in which far end crosstalk is larger than the near end crosstalk for identical loads at both ends. These observations have important implications in electromagnetic interference studies of outdoor systems such as railway signaling systems subjected to lightning strikes.