Transmission Line Electric Field Shielding by Objects

Deno, Don W.; Zaffanella, L.E.; Silva, J. M.

doi:10.1109/tpwrd.1987.4308099

Cited by 19 publications

(13 citation statements)

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“…Figure 2 shows the short-circuit current as a function of the square of the body height, a 2 , for several values of a/b and c/b when an external electric field of 1 kV m −1 at 60 Hz was applied to the semiellipsoidal model. The results show that the currents are proportional to the square of the height, as reported previously by Deno and Zaffanella (1982), Dimbylow and Findlay (2010) and Tarao et al (2019). However, the slope of the linear function in the figure depends on the ratios a/b and c/b, which indicates that the short-circuit current is closely related to the similarity ratio and ellipticity ratio as well as the height.…”

Section: Estimation Of Short-circuit Current Using Fitting Curvessupporting

confidence: 88%

“…where p is the height of the cross-section of the human body model (in m), and f 1 is the current distribution function (as indicated in table 3) used to calculate the induced current at p from the short-circuit current, which has been suggested by Deno and Zaffanella (1982). f 1 will be zero when p is at the grounded feet (p/a=0) and unity when p is at the head extremity (p/a=1).…”

Section: Induced Current On the Cross-section Of The Human Bodymentioning

confidence: 99%

“…It is essential to quantify electric field environments to ensure the safety of electric power workers. Experimental studies using mannequins initially showed that the short-circuit current flowing from the feet of a grounded human to the ground in the presence of an ELF electric field is proportional only to the square of the subject's height (Deno and Zaffanella 1982). Later studies were conducted using numerical calculations based on anatomical human body models (Dimbylow and Findlay 2010, Tarao et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Estimation of short-circuit current induced by ELF uniform electric fields in grounded humans with different body shapes based on a semi-ellipsoidal model

Tarao

Hayashi

Isaka

2020

Biomed. Phys. Eng. Express

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It has been reported that when a grounded human is exposed to an electric field at power frequency, a short-circuit current flowing from the feet to the ground is proportional to the square of his or her height. The current, however, should also vary with the body surface area, that is, body shape, even in people with the same height. In the present study, we confirmed this hypothesis using an analytical solution derived from a semi-ellipsoidal model. The short-circuit currents were calculated for various numerical human body models in which the horizontal length of a voxel was varied from 1.8 to 3.0 mm, and the results for different body shapes were compared. Finally, we derived an approximate expression for estimating the short-circuit current from the left-right width (2b), frontal thickness (2c), and height (a) of a human from the analytical solution. The short-circuit currents obtained from the approximate expression are consistent with those obtained from numerical calculations for 48 differently shaped human body models with a correlation coefficient of 0.9942. Hence, we concluded that the short-circuit current can be determined depending on the similarity ratio (a/b) and the ellipticity ratio (c/b) of the human body as well as the height. This finding is consistent with the numerical human body models that have been used previously, in which the similarity and ellipticity ratios were very close. Therefore, we can make the limited conclusion that the short-circuit current is proportional only to the square of the height. Additionally, numerical calculations showed that the short-circuit current is the same whether one foot or both feet are grounded.

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Section: Estimation Of Short-circuit Current Using Fitting Curvessupporting

confidence: 88%

Section: Induced Current On the Cross-section Of The Human Bodymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimation of short-circuit current induced by ELF uniform electric fields in grounded humans with different body shapes based on a semi-ellipsoidal model

Tarao

Hayashi

Isaka

2020

Biomed. Phys. Eng. Express

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“…An efficient method to reduce the field consists of using grounded shield wires under transmission lines [2]. Shield wires of single, double and triple configuration have been used for the analysis [3], [4]. Safety limit violations of magnetic fields for various transmission line configurations, at various Surge Impedance Loading (SIL) levels is necessary to set our safety level for different conditions.…”

Section: Introductionmentioning

confidence: 99%

Calculation of electric and magnetic field safety limits under UHV AC transmission lines

Baishya

Kishore

Bhuyan³

2014

2014 Eighteenth National Power Systems Conference (NPSC)

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With the ever burgeoning population rate and rapid industrialisation, the demand for power has increased manifold. Ultra High Voltage AC transmission is one of the measures to arrest this increasing energy demands. This paper evaluates the safety limits for electric and magnetic fields generated around the UHV AC transmission lines. Shielding methods are also evaluated to reduce the electric field at ground level. Moreover surface current density for human beings has also been calculated.

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“…This is why a person inside a metal cage (or a car) survives when the cage/car is hit with lightning; all the charge stays on outer skin of the cage. Even poor conductors shield electric fields (Deno, Zaffanella, & Silva, 1987).…”

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confidence: 99%

The Rise and Fall of Power Line EMFs: The Anatomy of a Magnetic Controversy

Palfreman¹

2006

Review of Policy Research

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The suggestion that power line electromagnetic fields (EMFs) cause diseases like cancer has generated dozens of popular articles and television news segments, hundreds of scientific studies, and numerous consensus reports; it has attracted the attention of epidemiologists, biologists, physicists, policymakers and lawyers. This article will examine the evolution of this controversy through a detailed analysis of the arguments that have been used for and against the hypothesis that power line EMFs have adverse health effects. This article argues that the power line EMF issue provides a classic case study for exploring the challenges citizens, scientists, and policymakers face in sorting out a complex science-based controversy. This story not only brings together many different perspectives and-from popular notions of cancer clusters to complex epidemiological arguments, from to state-of-the-art animal studies to policy instruments such as the precautionary principle-but also reveals the manner in which a heated controversy can be effectively resolved over time. Copyright 2006 by The Policy Studies Organization.

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Transmission Line Electric Field Shielding by Objects

Cited by 19 publications

References 0 publications

Estimation of short-circuit current induced by ELF uniform electric fields in grounded humans with different body shapes based on a semi-ellipsoidal model

Estimation of short-circuit current induced by ELF uniform electric fields in grounded humans with different body shapes based on a semi-ellipsoidal model

Calculation of electric and magnetic field safety limits under UHV AC transmission lines

The Rise and Fall of Power Line EMFs: The Anatomy of a Magnetic Controversy

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