A New Method of Analysis for Multigrounded Cable Shields Inductively And Conductively Coupled to Multigrounded-Neutral Power Lines

A configuration in which a communications cable with a multigrounded shield has a length that is inductively and conductively coupled to a multigrounded-neutral conductor of a power line is analyzed. A new formulation is given for the power-frequency voltages and currents that develop along the shield and core of the cable. A simplified network is derived for the coupled systems from which the variables of the formulation can be evaluated. There are no restrictionson the uniformity of the grounds, the spacing of bonds, or the terminations. The procedures aredirectly applicable to the evaluation of shielding effectiveness and to protection problems arising from power faults.