Initial Assessment of Reradiation from Power Lines

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

doi:10.1109/tbc.1985.266556

Cited by 10 publications

(17 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the simulation model, the generalized characteristic equation of PTL as shown in ( 3) is constructed, and the generalized characteristic equation at each frequency point is solved to obtain the characteristic values for each mode. Substitute the characteristic values into (7) to further obtain the mode signifcances for each mode. And the variation of the mode signifcance for each mode with frequency is shown in Figure 6(a).…”

Section: Analysis Of Induced Current On Ptl Below 17 Mhzmentioning

confidence: 99%

“…According to Section 4.1, the external excitation to the simulation model adopts a vertically polarized plane wave of 1 V/m, and the incident direction of it is perpendicular to the direction of the PTL. Ten, the variation of the mode excitation coefcient with frequency for each mode is obtained by (7), which is shown in Figure 6(b).…”

Section: Analysis Of Induced Current On Ptl Below 17 Mhzmentioning

confidence: 99%

“…However, the mode excitation coefcient of mode 3 is 0 at its internal resonant frequency. According to (7), the mode excitation coefcients depend on the inner product of the external excitation and the characteristic mode currents. Because the magnitude and direction of the external excitation are known, the magnitude and direction of the characteristic mode currents also need to be given to further explain the above phenomenon.…”

Section: Analysis Of Induced Current On Ptl Below 17 Mhzmentioning

confidence: 99%

“…In order to further study the coupling between the external excitation and each characteristic mode current in 1.7∼3 MHz, continue to use (7) to obtain the mode excitation coefcients of each mode. Te calculation results are shown in Figure 9(b).…”

Section: Analysis Of Induced Current On Ptl In 17 Mhz-3 Mhzmentioning

confidence: 99%

“…According to this theory, the analysis of induced current is divided into two cases: when the power towers are connected to the ground wires, the "loop antenna" could be equivalent to the power towers, the ground wires, and their mirror images to the ground within a span. At this time, the variation of the induced current can be analyzed according to the resonance theory of the loop antenna and then proposes the "integer wavelength loop resonance frequency" corresponding to the peak values of the induced current [3,7]; when the power towers are insulated from the ground wires, the "loop antenna" is no longer included in the PTL, but the power towers can still be regarded as a wire antenna perpendicular to the ground. Based on this, the "λ/4 resonance frequency" corresponding to the peak values of the induced current can be obtained by the resonance theory of the halfwave antenna [3,8].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Analysis of Induced Current on Power Transmission Lines for the Reradiation Interference in Medium Wave Based on Characteristic Modes

Tang

Yang

Zhang³

et al. 2022

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

The reradiation interference from power transmission lines (PTL) on the adjacent wireless stations is directly caused by the induced current on metal parts, which means the interference could be suppressed by reducing the induced current. In order to effectively analyze the induced current of PTL, a method for analyzing induced current on PTL based on characteristic modes is proposed combining MoM with intrinsic modes. This method breaks through the traditional antenna resonance theory proposed by IEEE and could effectively avoid model equivalent defects and frequency limitations of traditional methods. Firstly, a generalized characteristic equation about the characteristic mode currents of PTL is constructed, and the numerical solutions of the characteristic mode currents are obtained by the idea of a discrete solution. Then, through the weighted orthogonal relationship between different characteristic mode currents, the expansion coefficients of the characteristic mode currents are obtained; finally, combined with the Poynting theorem, the physical meaning of the expansion coefficients and their related quantities are explained from the perspective of energy and the analysis of the induced current is realized from the physical level. The results of the example analysis show that the error between the peak frequencies of the induced current calculated by the method in this paper and the peak frequencies calculated by MoM does not exceed 2.46% and the method in this paper can well explain the disappearance of the “double wavelength loop resonance frequency” under the excitation of a vertically polarized plane wave.

show abstract

Section: Analysis Of Induced Current On Ptl Below 17 Mhzmentioning

confidence: 99%

Section: Analysis Of Induced Current On Ptl Below 17 Mhzmentioning

confidence: 99%

Section: Analysis Of Induced Current On Ptl Below 17 Mhzmentioning

confidence: 99%

Section: Analysis Of Induced Current On Ptl In 17 Mhz-3 Mhzmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of Induced Current on Power Transmission Lines for the Reradiation Interference in Medium Wave Based on Characteristic Modes

Tang

Yang

Zhang³

et al. 2022

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

show abstract

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

Tang,

Wang,

Zhang

et al. 2023

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

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.

show abstract

The Research of Reradiation Interference on Corner Transmission Lines Based on Characteristic Mode Analysis

Huang,

Zhang,

Tang

et al. 2024

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

Radio stations are seriously affected by transmission line reradiation interference, but most of the existing methods for analyzing and solving reradiation interference on transmission lines focus on approximating the physical problem through mathematical models and algorithms, and it is difficult to study the correlation between transmission lines and reradiation interference in depth. This paper introduces the characteristic mode theory to study the influence factors of reradiation interference on transmission lines, which can decompose the surface induced current of transmission lines into a series of mutually orthogonal mode currents. This paper verifies the correctness of applying the MS (mode significance) value of the characteristic mode theory to analyze the reradiation interference through a simple transmission line example. Taking a line with 5 towers as an example, by analyzing the characteristic mode currents of transmission lines with different forwarding angles and linear arrangements, we not only verified that the characteristic mode currents can well characterize the reradiation interference, but also verified that the characteristic currents of different modes have a direct connection with the structure of the line, which can be applied in the process of designing or reconstructing the towers of the transmission lines, to predict the influence of different structural parameters on electromagnetic scattering, so as to optimize the tower design to reduce the reradiation interference effects and thus optimize the tower design to reduce reradiation interference. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.

show abstract

Initial Assessment of Reradiation from Power Lines

Cited by 10 publications

References 4 publications

Analysis of Induced Current on Power Transmission Lines for the Reradiation Interference in Medium Wave Based on Characteristic Modes

Analysis of Induced Current on Power Transmission Lines for the Reradiation Interference in Medium Wave Based on Characteristic Modes

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

The Research of Reradiation Interference on Corner Transmission Lines Based on Characteristic Mode Analysis

Contact Info

Product

Resources

About