Title :
Transients on multiconductor transmission lines above dissipative earth-numerical simulation and measurement
Author :
Van der Merwe, Jaco ; Cloete, Johannes Hendrik ; Reader, Howard Charles
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Stellenbosch, South Africa
fDate :
5/1/2003 12:00:00 AM
Abstract :
A finite-difference time-domain (FDTD) analysis is presented to simulate, up to the high-frequency regime, transients on multiconductor transmission lines above dissipative earth. Excitation is in the high-frequency regime if the pulse has significant spectral content up to ω≈ωc, with ωc the frequency where the conduction and displacement current densities have equal magnitude. Thus, ωc=σg/ε0εrg with σg and εrg the ground conductance and relative permittivity. The FDTD algorithm extends the formulation of Agrawal et al. (1980), by incorporating the theory of D´Amore and Sarto for the interaction of wide-band transients with the earth. Careful experimental testing of the new algorithm is presented. The measurement configuration consists of two parallel wires; first suspended above an aluminum sheet to test the code in the low-frequency regime; then above a block of absorbing material for experiments in the high-frequency regime. The end of one of the conductors is driven with a 2-ns synthesized impulse by a stepped-frequency, automatic network analyzer. Reflected and cross-talk signals are presented in the time domain. These show good agreement with the numerically predicted common mode, differential mode and mode-converted pulses.
Keywords :
aluminium; convolution; crosstalk; finite difference time-domain analysis; multiconductor transmission lines; network analysers; transient analysis; transients; transmission line theory; Al; Al sheet; FDTD algorithm; FDTD analysis; absorbing material; automatic network analyzer; common mode pulses; conduction; crosstalk signals; differential mode pulses; displacement current densities; dissipative earth; ground conductance; high-frequency regime; low-frequency regime; measurement configuration; mode-converted pulses; multiconductor transmission lines; numerical simulation; reflected signals; relative permittivity; stepped-frequency ANA; time domain measurements; transients; wideband transients; Analytical models; Conducting materials; Earth; Finite difference methods; Frequency; Multiconductor transmission lines; Power system transients; Time domain analysis; Transient analysis; Transmission line measurements;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
DOI :
10.1109/TEMC.2003.811297