Title :
Ground loss effects in power line reradiation at standard broadcast frequencies
Author :
Trueman, C.W. ; Kubina, S.J. ; Baltassis, C.
Author_Institution :
Electromagn. Compatibility Lab., Concordia Univ., Montreal, Que., Canada
fDate :
3/1/1988 12:00:00 AM
Abstract :
Reradiation of a standard broadcast antenna´s signal from a high-voltage power line is often analyzed by computer modeling. The resonant behavior of a power line operating over lossy ground is investigated using the numerical electromagnetics code (NEC) which uses the Sommerfeld-Norton (SN) ground model, for a highly accurate computation of the interaction of a power line with lossy ground. It is shown that lossy ground damps the resonant response of the power line and so, substantially reduces the reradiated field. Since the SN ground option is costly in CPU time, the effects of lossy ground were approximated using the tower footing impedance concept. A systematic evaluation of the accuracy of the approximation is made. An approximate technique for incorporating the approximate techniques presented are sufficiently accurate that the economical method-of-images solution can be used in most cases
Keywords :
broadcast antennas; interference suppression; power overhead lines; radio broadcasting; Sommerfeld-Norton ground model; ground loss effects; high-voltage power line; method-of-images solution; numerical electromagnetics code; power line reradiation; radio broadcasting; resonant response; standard broadcast antenna; standard broadcast frequencies; tower footing impedance; Broadcasting; Electromagnetic modeling; Frequency; Impedance; National electric code; Poles and towers; Power generation economics; Resonance; Scattering; Tin;
Journal_Title :
Broadcasting, IEEE Transactions on