Electric and Magnetic Coupling Between Neighboring Multiconductor Transmission Lines Considering Short Interaction Lengths

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Abstract
Coupling phenomena between two parallel multiconductor transmission lines is usually dealt with using modal analysis techniques. However, when the interaction length is small compared to the wavelength, a simpler quasistationary approach can and should be employed. Using the latter approach, the general problem of the determination of capacitive and inductive differential voltages between conductors of the victim transmission-line circuit is addressed, resorting to the formalism of the per-unit-length series impedance and shunt admittance matrices. An application example concerning the interaction between an overhead power line and a two-conductor railway is presented. Results obtained are interpreted and validated using electromagnetic-field calculations. The dependence of the differential voltages on the frequency, on the interaction length, and on the lateral distance between interacting transmission lines is analyzed and discussed.

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