Abstract
With the aim to analyze field-to-line coupling effects based on energy spectrum, parallel finite-difference time-domain (FDTD) method is applied to calculate the induced voltage on overhead lines under high-power electromagnetic (HPEM) environment. Firstly, the energy distribution laws of HEMP (IEC 61000-2-9), HEMP (Bell Laboratory), HEMP (Paulino et al., 2010), and LEMP (IEC61000-4-5) are given. Due to the air-earth stratified medium, both the absorbing boundary and the connecting boundary applied to scattering by finite-length objects are separately set in aerial and underground parts. Moreover, the influence of line length on induced voltage is analyzed and discussed. The results indicate that the half-peak width is wider with the increase of the line length. But the steepness of induced voltage on the overhead line is invariable. There is no further increase in the peak of induced voltage especially when the line length increases to be equivalent to the wavelength of the frequency bands with the maximum energy.
Highlights
The problem of coupling effects on overhead lines caused by high-power electromagnetic (HPEM) environment has been studied extensively due to the increasing demand by the public for good reliability in power supply and communication [1,2,3,4]
In terms of a specific overhead line, direct strikes have a high probability of producing an insulation flashover, indirect effect caused by high-power electromagnetic pulse is much more frequent [5, 6]
What should be known is that how much the induced voltage can be produced on the transmission line under HPEM environment and which factors are related to the voltage magnitude
Summary
The problem of coupling effects on overhead lines caused by high-power electromagnetic (HPEM) environment has been studied extensively due to the increasing demand by the public for good reliability in power supply and communication [1,2,3,4]. In [2], Green’s function for analyzing the coupling effects on overhead lines under the excitation of space electromagnetic fields has been presented by Tesche et al TL model is an approximate method due to the fact that the antenna current, namely, the secondary radiation of the conductor, is ignored. Most of the previous work was focused on the coupling effects under the lightning electromagnetic pulse (LEMP) environment, and less attention has been paid to the relationship between the line configuration and induced voltage under electromagnetic pulses with different frequency bands. This work deals with field-to-line coupling effects under four kinds of HPEM environments with different frequency bands by applying parallel FDTD method.
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