This article was posted 03/21/2011 and is most likely outdated.

Impact of Transmission Lines on Stray Voltage
 

 

Topic -Stray Voltage
Subject -Impact of Transmission Lines on Stray Voltage

March 21, 2011
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Impact of Transmission Lines on Stray Voltage

By Nagy Abed, Member, IEEE, Sasan Salem, Member, IEEE, and Jim Burke, Fellow, IEEEImage1

Abstract-- The purpose of this paper is to study the effect of transmission system parameters and operating conditions on stray voltage levels. This includes the transmission line conductor configurations, line loading levels, grounding system parameters, and unbalance loading. Excessive stray voltages levels may have a negative effect on dairy farm cows and endanger personnel safety. EMTP-RV was used to model the coupled electromagnetic- power circuit system. EMTP models of the poles and wires were built to represent the transmission line electromagnetic behavior and the stray voltage generation mechanism. The parameters of the proposed models were obtained from the technical literature. Different simulations were conducted by varying the system parameters and operating conditions. Calculations and field tests, which included the effect of earth contact resistance, indicated that most measured values of stray voltage may be incorrect and that the safety hazard to humans and animals may be greatly exaggerated.  A discussion of these results is presented. 

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Comments

  • The assumed HBM does not say if this is a 60Hz impedance, or is a DC resistance.

    "Recent published tests, performed by the authors, show human resistance values for hand-to-hand..." - not cited in references - does someone have this paper? This is probably the largest published R I have ever seen for a HBM.

    Brian  March 23 2011, 8:14 pm EDT
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  • Jim--congratulations on another fine paper.

    I am curious, is the use of the term Neutral-to-Earth Voltage (NEV) appropriate to use here?

    I was under the impression that static wires were primarily used for lightning protection and not designed as a continuous current carrying neutral conductor. If the static wires are intentionally connected to the substation transformers as an actual neutral, then I can understand the use of the Neutral-to-Earth Voltage term.

    I can see how you could have a "Ghost" voltage reading on a down ground from a static wire but a 500 ohm resistor would only bleed off 8 mA.

    Chuck Untiedt  March 23 2011, 12:29 am EDT
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