Numerical Computation of the Reradiation from Power Lines at MF Frequencies

Trueman, C.W.; Kubina, S.J.

doi:10.1109/tbc.1981.266402

Cited by 40 publications

(25 citation statements)

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“…DEVELOPMENT OF THE COMPUTER MODEL The development of a computational model of the power line of Fig. 2 which generates radiation patterns in agreement with measurements on a 600-scale model of the straight, evenly spaced power line has been reported in [2], and is summarized here. The power-line model was developed to represent Ontario Hydro's type VlS towers for a 500-kV power line, but could be adjusted to represent other tower types.…”

mentioning

confidence: 81%

“…The prediction of the azimuth pattern for an actual site of realistic complexity has been addressed in [2], where the computer-model pattern was shown to be in reasonable agreement with a scale-model measurement. The problem of detuning a complex site must be dealt with as a next step in this work.…”

Section: E Rf Current On the Tower And Detuning Stubmentioning

confidence: 99%

“…BACKGROUND Butler et al [1] published calculated curves of the transmitted field versus distance from the aperture, obtained using dipole moments, and Graves et al [2] calculated curves using integral equations and a dipole field approximation. These were for plane electromagnetic waves normally incident on the surface containing the aperture.…”

Section: E Rf Current On the Tower And Detuning Stubmentioning

confidence: 99%

“…The wire radius is adjusted so that the cylindrical thin wire is electrically equivalent to the square cross section tapered tower. This electrical equivalence of the computer model to the 600-scale factor measurement model is determined by comparing the frequency dependence of the computer model with various radii with the resonant behavior of the measurement model, over a perfect ground, as described in [2]. The tops of the wires representing the towers are interconnected by a "skywire".…”

mentioning

confidence: 99%

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Corrective Measures for Minimizing the Interaction of Power Lines with MF Broadcast Antennas

Trueman

Kubina

Belrose

1983

IEEE Trans. Electromagn. Compat.

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New high-voltage power lines are often built in close proximity to MF/AM broadcast antennas. The "skywire" which joins the tops of the power-line towers creates closed loops for RF current on the power line and its image in ground, and these loops can be resonant in the MF band. If the broadcast antenna operates on such a resonant frequency, it induces large currents on the skywires and power-line towers, and "reradiation" from these induced currents can considerably alter the broadcast antenna's radiation patterns. This paper uses computer modeling to systematically examine several techniques for "detuning" the power line, namely: isolating towers from the skywire, series insulators in the skywires, stub detuners on the skywires, and short capacitively terminated stub detuners on the towers. The mechanism which makes each detuner effective is seen from the RF current distribution computed for the power line and detuner. The bandwidth of each detuner is assessed. Consideration is given to the difficulties that can arise in the implementation of each detuner design on a real power line. All of these detuner designs have been tested by scale-model or full-scale measurements. Only when detuning has been made a systematic economical procedure can this special EMC problem be regarded as solved.

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mentioning

confidence: 81%

Section: E Rf Current On the Tower And Detuning Stubmentioning

confidence: 99%

Section: E Rf Current On the Tower And Detuning Stubmentioning

confidence: 99%

mentioning

confidence: 99%

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Corrective Measures for Minimizing the Interaction of Power Lines with MF Broadcast Antennas

Trueman

Kubina

Belrose

1983

IEEE Trans. Electromagn. Compat.

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“…Trueman and S.J. Kubian to simplify the scheme by equating transmission line towers and broadcast antennas to a reduced scale cylindrical linear model [5]. In a subsequent study of the passive interference level of the line, the two considered the spatial structure of the tower in the transmission line tower modeling and equated both the main and diagonal sections to a cylinder of 0.01 m radius [6].…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Various Attribute Factors on Passive Interference in UHV Transmission Lines Based on Orthogonal Test

Zhang¹,

Gan²,

Zhou

et al. 2022

Energies

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Considering the problem of passive interference caused by electromagnetic scattering effects of transmission lines to neighboring radio stations and other communication equipment, this paper refines the passive interference calculation model for UHV transmission lines. The solution calculation is carried out by the Method of Moments, and the law of passive interference effect of the tower structure, auxiliary angles, and ground roughness under different frequency incident waves, is summarized. By designing an orthogonal test, the degree of influence of the above attributing factors on passive interference results in the established joint model of three towers with two stall distances was explored by using Analysis of Variance. The results demonstrate that both auxiliary angles and rough ground show a pattern of enhanced electromagnetic scattering effect with increasing plane wave frequency in single-factor analysis. When multiple factors are combined, the rough ground has a significant effect on the results. This method effectively evaluates the passive interference influence factor while reducing the modeling and simulation engineering and provides a reference for the passive interference prediction in subsequent practical projects.

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Reradiation Interference Suppression of Power Transmission Lines Based on Characteristic Mode Theory

Tang,

Wang,

Zhang

et al. 2023

IEEJ Transactions Elec Engng

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In order to decrease the reradiation interference (RRI) of power transmission lines, aiming at the defects that the existing RRI suppression methods cannot be applied to the constructed power transmission lines, and cannot suppress all the RRI extreme values in the frequency band, this paper innovatively proposes a RRI suppression method based on characteristic mode (CM) theory. Firstly, we briefly introduce the CM theory and decompose the total scattering field into the superposition of the characteristic electric fields; secondly, the influence of inductance and capacitance characteristics of the reactive loads on radiation behavior of the CMs is analyzed, and the ideal position for reactive loading is also discussed to reduce the contribution of CM to the total RRI; finally, a simulation experiment is carried out in AM broadcasting band, and the modal weighting coefficients of main CMs affecting the RRI is greatly reduced in the frequency band by reactive loading. Simulation results show that compared with the existing method, the proposed method can reduce the peak value of RRI by 43.9% and the overall RRI by 29.7%. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Numerical Computation of the Reradiation from Power Lines at MF Frequencies

Cited by 40 publications

References 1 publication

Corrective Measures for Minimizing the Interaction of Power Lines with MF Broadcast Antennas

Corrective Measures for Minimizing the Interaction of Power Lines with MF Broadcast Antennas

Research on the Influence of Various Attribute Factors on Passive Interference in UHV Transmission Lines Based on Orthogonal Test

Reradiation Interference Suppression of Power Transmission Lines Based on Characteristic Mode Theory

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