Characterization Of A Railways System
Overhead Transmission Line Excited By
A Lightning Electromagnetic Field
Author(s)
F. Delfino, R. Procopio & M. Rossi
Abstract
We present a new field-to-line coupling model for the analysis of overvoltage on
overhead dc traction power lines of modern electric mass-transit systems, such as
Light Rail Transportation Systems (LRTS), in the case of a lightning strike in the
vicinity of the line.
The developed model is essentially based on a mathematical procedure
involving suitable expansions of the induced currents and of the scattered
voltages by means of a series of Gegenbauer polynomials.
Such a procedure allows the integro-differential system describing the fieldto-
line coupling problem to be solved with faster performances in comparison to
more classical \“full-Maxwell” approaches (e.g. MOM, FDTD) for a given
accuracy. This feature makes it possible to find, in a reasonable time, a frequency
domain representation of the contact line in terms of a matrix of impedances and
open circuited voltages in response to several lightning strikes, taking into
account the effect of radiated power, which is not modelled by the classical
transmission line approach. This phenomenon is usually quite relevant for typical
contact line geometries, since they are characterized by transversal dimensions
that are not negligible with respect to the relatively short length of each overhead
section.
This representation is suitable for a future integration (in a case using modal
analysis) in a time domain model that can be analyzed by means of a circuit
simulator. The evaluation of the effects of several lightning strikes with different
impact points and characteristics will allow a statistical assessment of the
protection level offered by different technical solutions to be performed (by way
of example, the different location of the surge arresters).
Keywords: transmission lines, transportation systems, lightning, overvoltages.
Keywords
transmission lines, transportation systems, lightning, overvoltages
Related Book
Other papers in this volume
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