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pwr2thepeople
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Join Date: Aug 2007
Location: Indiana, USA
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Transmission Line Field Calculator

02/27/2009 6:45 PM

Does anyone know a (relatively) easy way to calculate electric field and magnetic field strength at the edge of a transmission line right-of-way? I've done a few searches and haven't been able to find a modeling package that can do it. I can brute-force it with a pencil, but I'd have to re-do it for every conductor & pole configuration along the entire path, and I'd rather not if there's an easier way.

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Pathfinder Tags: field strength transmission line
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CoronaCameraMan
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Location: Sheboygan, WI USA
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#1

Re: Transmission Line Field Calculator

02/28/2009 11:04 PM

I think you need to learn how to search:

Electric Field Intensity -

http://www.newton.dep.anl.gov/askasci/phy99/phy99129.htm

Magnetic Field Intensity - (Search for yourself)

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pwr2thepeople
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#5
In reply to #1

Re: Transmission Line Field Calculator

03/02/2009 9:37 AM

As I said, I CAN brute-force it, and that's what your suggestion would require. I know the formulae, and I can use excel or a calculator. However, the distance (D) is pretty much continuously variable. I'd have to do a new calculation at every pole, every mid-span (to account for line sag) and every location where the edge of the right-of-way is not exactly parallel to the line.

I was hoping to find some type of practical thumbrule or simplification which would let me reduce the number of calculations needed. This is urban construction, so the path has to follow 150 year old roadways and property lines, meaning the line has almost as many angles as spans.

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Anonymous Poster
#2

Re: Transmission Line Field Calculator

02/28/2009 11:11 PM

See if you can find anything in: http://www.martindalecenter.com/Calculators4.html
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babybear
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#3

Re: Transmission Line Field Calculator

02/28/2009 11:48 PM

Hi pwr2thepeople:

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pwr2thepeople
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#6
In reply to #3

Re: Transmission Line Field Calculator

03/02/2009 9:47 AM

Thanks, BabyBear, but none of these are of use in my situation. Most of them deal with determining the impedance of a line, more frequently RF lines and waveguides.

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dornrobin
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#9
In reply to #3

Re: Transmission Line Field Calculator

07/19/2025 7:07 AM

A tool for calculating characteristic line characteristics that provide the conductor type and configuration of a three-phase overhead transmission line is the transmission line parameter calculator Mehrwertsteuer Rechner.

The resistance R, conductance G, susceptibility B, and reactance X are the parameters that are calculated. These figures are calculated in per-unit, lumped or total (for a given line distance), and distributed (per unit of distance).
The computations section includes the following controls:
Calculation of Parameters
The purpose of this section is to input the data required to calculate the characteristic line parameters displayed in the Results panel.

Data Input
Conductor Type: All of the conductor kinds listed in the Conductors table are listed in this combo box. Refer to the Conductor Type section below to add, remove, or modify a particular conductor and its properties.
Tower Configuration: All of the tower configurations that are accessible in the Tower Configurations table are listed in this combo box. Please refer to the Tower Configuration section below to add, remove, or modify a specific tower configuration.
Line Length: This represents the transmission line's distance. while using the English system, the units are miles; while using the Metric (SI) system, they are kilometers.

Line Length Units: When entering the line length, the line length units indicate which measuring system to use. Either the English system or the Metric (SI) system are available. The system described here will also display the intermediate and final findings.
Power Base: The MVA of the system's voltampere base.
Voltage Base: The KV value of the line-line voltage base.
Impedance Base: The Ohm value of the impedance base. When the voltage base and power base are changed or entered, this value is automatically calculated.
Admittance Base: Siemens's admittance base. Additionally, it is automatically calculated as the impedance base's inverse.
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WOODROOSTER
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#4

Re: Transmission Line Field Calculator

03/01/2009 11:26 AM

You may want to delve into the South Florida archives where this problem was addressed in the late 80's - early 90's. Check with FP&L. The subject was covered intensily in the news. It might serve as good background info for you.

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pwr2thepeople
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#7
In reply to #4

Re: Transmission Line Field Calculator

03/04/2009 8:51 AM

Thanks, WoodRooster. Although FPL didn't help me directly, I did find an article about them which mentioned a design/modeling package by EDSA which has electric & magnetic field modules. It should do the trick.

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CoronaCameraMan
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#8

Re: Transmission Line Field Calculator

03/08/2009 2:46 PM

Check this out -

http://www.electricenergyonline.com/?page=show_news&id=106106

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