Power line tower models above 1000 kHz in the standard broadcast band

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

doi:10.1109/11.59847

Cited by 15 publications

(9 citation statements)

References 14 publications

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“…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]. IEEE recommended a line model modeling approach that equates transmission lines to cylinders based on other subsequent studies [7].…”

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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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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“…In the simulation model, the transmission line was made up of a thin wire, and the reradiation interference was obtained by the MOM. In the following studies, the transmission steel tower model was gradually similar to the actual tower [8]- [10]. Zhao used the thin wire instead of the angle steel in the transmission steel tower to generate the wire model and analyzed the reradiation about the loop consisting of two transmission towers, overhead ground wire and the ground image [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Study on Improved CG Algorithm for Reradiation Interference Calculation of Transmission Steel Tower

et al. 2022

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With the development of extra-high voltage and ultra-high voltage transmission line in China, the reradiation interference generated by induced current on the surface of transmission steel tower becomes more serious to the radio station in the vicinity. In this paper, the calculation method for reradiation interference of transmission steel tower based on method of moment is analyzed. And in order to reduce the impedance matrix storage data in the memory space and the number of iterations in the calculation, the preprocessing of matrix sparse and diagonal norm precondition is presented to improve the performance of the conjugate gradient algorithm for the reradiation interference calculation. The reradiation interference of a standard 500 kV transmission steel tower is calculated using the improved conjugate gradient algorithm. And the results show that the algorithm enhances the convergence and stability after preprocessing and is suitable to calculate the reradiation interference of super-large metal truss structure target.INDEX TERMS Conjugate gradient, method of moment, reradiation interference, transmission steel tower.

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“…Based on loop antenna theory and the results reported in [15][16][17][18][19][20], Trueman C.W. et al explained the mechanism of RRI resonance in AM radio frequency band (535 kHz~1705 kHz) when towers are connected to grounding wires.…”

Section: Mechanism Of Rri Resonance and Estimation Of Resonant Frequementioning

confidence: 99%

“…et al built a 1/600 scaled model of the actual transmission line corresponding to the numerical model in Fig. 2 [20]. They obtained the resonant frequencies in medium frequency range corresponding to integral multiples of the wavelength through experiments, namely 0.434 MHz, 0.850MHz and 1.280 MHz.…”

Section: Towers Linked By Grounding Wiresmentioning

confidence: 99%

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Resonant Frequency Estimation of Reradiation Interference at MF from Power Transmission Lines Based on Generalized Resonance Theory

Tang¹,

Chen²,

Zhao³

et al. 2015

Journal of Electrical Engineering and Technology

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-The resonant mechanism of reradiation interference (RRI) over 1.7MHz from power transmission lines cannot be obtained from IEEE standards, which are based on researches of field intensity. Hence, the resonance is ignored in National Standards of protecting distance between UHV power lines and radio stations in China, which would result in an excessive redundancy of protecting distance. Therefore, based on the generalized resonance theory, we proposed the idea of applying model-based parameter estimation (MBPE) to estimate the generalized resonance frequency of electrically large scattering objects. We also deduced equation expressions of the generalized resonance frequency and its quality factor Q in a lossy open electromagnetic system, i.e. an antennatransmission line system in this paper. Taking the frequency band studied by IEEE and the frequency band over 1.7 MHz as object, we established three models of the RRI from transmission lines, namely the simplified line model, the tower line model considering cross arms and the line-surface mixed model. With the models, we calculated the scattering field of sampling points with equal intervals using method of moments, and then inferred expressions of Padé rational function. After calculating the zero-pole points of the Padé rational function, we eventually got the estimation of the RRI's generalized resonant frequency. Our case studies indicate that the proposed estimation method is effective for predicting the generalized resonant frequency of RRI in medium frequency (MF, 0.3~3 MHz) band over 1.7 MHz, which expands the frequency band studied by IEEE.

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Power line tower models above 1000 kHz in the standard broadcast band

Cited by 15 publications

References 14 publications

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

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

Study on Improved CG Algorithm for Reradiation Interference Calculation of Transmission Steel Tower

Resonant Frequency Estimation of Reradiation Interference at MF from Power Transmission Lines Based on Generalized Resonance Theory

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