Reduction of electric field strength by two species of trees under power transmission lines

Zhou, Hongwei; Sun, Lin; Yang, Yang; Liu, Tianshi; Xie, Peimin; Ma, Ling

doi:10.1007/s11676-017-0541-1

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…In the formula 1 = √( − ) 2 + 2 , 2 = √( − V ) 2 + 2 , c is the propagation speed of electromagnetic waves in vacuum, is the relative dielectric constant of the background medium (assuming that the polymer-modified wood material is uniform and isotropic) [21,22], and is the time constant. The calculation process is equivalent to focus at each point ( , ).…”

Section: Methodsmentioning

confidence: 99%

Imaging of Internal Defects of Polymer-Modified Wood Using Total Focusing Method

Sun

Zhou

Jiao

et al. 2019

Advances in Polymer Technology

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Polymer modification can improve the stability and corrosion resistance of wood, but it could create defects inside wood during the modification processing. Detection of defects inside polymer-modified wood can reduce wood losses and prevent the occurring of defects. Data simulation and tomographic imaging of polymer-modified wood internal defects were carried out using electromagnetic waves with nondestructive testing. This study constructed the polymer-modified wood models, simulated the electromagnetic scattering wave, and used the total focusing method to perform tomography of the defects in the polymer-modified wood. By analyzing the imaging characteristics of different types of defects, the effectiveness of electromagnetic waves in the detection of internal defects of polymer-modified wood was proved. This method can be extended to test internal defects of other high molecular polymers.

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Section: Methodsmentioning

confidence: 99%

Imaging of Internal Defects of Polymer-Modified Wood Using Total Focusing Method

Sun

Zhou

Jiao

et al. 2019

Advances in Polymer Technology

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“…analyses in previous studies used simple-shaped tree models that ignored the detailed shapes of the branches and leaves. For example, [3] used a sphere or cylinder, [4] used an ellipsoid with a cylinder, and [5] used a combination of a sphere, truncated cone, and cylinder to approximate the tree shape. However, when these simple-shaped tree models were used, the electric field shielding effect could not be accurately calculated.…”

Section: Journal Of Advanced Simulation In Science and Engineeringmentioning

confidence: 99%

“…Each branch was shaped as a truncated cone with different radii at the start and end points. The tree height in [5] was approximately 10 m, and we aimed for a similar tree height. For this adjustment, the terminal branches were set to the eighth layer while the trunk was considered the first layer.…”

Section: Tree Modelmentioning

confidence: 99%

“…This is because at low frequencies, the electric field inside the human body has a low value of approximately 10 −4 to 10 −7 times the externally applied electric field [2]. Since the average resistivity of living broad-leaved trees is only several tens times higher than that of the human body [5],…”

Section: Journal Of Advanced Simulation In Science and Engineeringmentioning

confidence: 99%

“…However, trees under power lines shield the human body from the electric field, and the electrostatically induced current flowing through the human body is also reduced. The shielding effect of trees has been widely investigated through both measurements and numerical analyses [1,3,4,5]. However, numerical…”

Section: Introductionmentioning

confidence: 99%

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Calculation of electrostatically induced steady-state current flowing through human body near a tree under power transmission lines

Tanaka,

Hamada

2024

JASSE

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Trees under power transmission lines effectively shield the human body from electric field exposure. We numerically analyze the electrostatically induced steady-state current that flows through the human body near a tree under three-phase transmission lines and quantitatively investigate the reduction ratio (RR) of the induced current owing to the tree. Stochastic tree models that consider the detailed shapes of branches and leaves are created by controlling the growth direction of the branches using random numbers. Moreover, we create simpleshaped tree models with dimensions similar to those of the stochastic tree models. Comparison of induced currents and RRs calculated using these tree models confirms that the simple-shaped tree model tends to overestimate the RR.

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Electric Field Reduction in an EHV Substation for Occupational Exposure via Transposition of Conductors

Devarajan

Punekar

2018

IEEE Trans. Power Delivery

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Reduction of electric field strength by two species of trees under power transmission lines

Cited by 5 publications

References 17 publications

Imaging of Internal Defects of Polymer-Modified Wood Using Total Focusing Method

Imaging of Internal Defects of Polymer-Modified Wood Using Total Focusing Method

Calculation of electrostatically induced steady-state current flowing through human body near a tree under power transmission lines

Electric Field Reduction in an EHV Substation for Occupational Exposure via Transposition of Conductors

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