Lightning-Induced Current in a Cable Buried in the First Layer of a Two-Layer Ground

• Published in: IEEE transactions on electromagnetic compatibility Vol. 56; no. 4; pp. 956 - 963
• Main Authors: Saldanha Paulino, Jośe Osvaldo, Fonseca Barbosa, Celio, do Couto Boaventura, Wallace
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.08.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Arcs, sparks, lightning; Cable shielding; Conductivity; Currents and their properties; Electric discharges; Electrical engineering. Electrical power engineering; Electromagnetic compatibility; Equations; Exact sciences and technology; General theory of currents; General theory of fields and particles; Grounds; High voltage or high current generators; Horizontal; Induced current; Lightning; Mathematical analysis; Mathematical model; Partially conserved axial-vector currents; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; Power cables; Resistivity; Shields; Surface impedance; The physics of elementary particles and fields; Time-domain analysis; two-layer ground; Underground cables; Various equipment and components; Waveforms; Surface impedance; Electrical conductivity; Permeability; Azimuthal field; Induced current; Lightning discharge; two-layer ground; Lightning; Wave forms; Magnetic fields; Electric fields; Permittivity; Electrical characteristic; Return stroke
• ISSN: 0018-9375; 1558-187X
• DOI: 10.1109/TEMC.2013.2292557

This paper analyzes the effect of a two-layer ground on the current induced in the shield of a buried cable due to lightning flashes. Each layer is assumed to be horizontal, homogeneous, isotropic, and having its own electrical parameters: conductivity, permittivity, and permeability. The inducing horizontal electric field is calculated for the incident azimuthal magnetic field and it is used for the calculation of the induced current. The calculation method is validated by comparing its results with results published in the literature. The currents induced in the shield of a buried cable by typical return-stroke current waveforms are calculated. The results show that the induced current waveform is initially determined by the first layer but, for later times, it follows the current that would be induced if the ground was homogeneous and had the characteristics of the second layer.