It is used extensively in Brazil for small rural properties.
What annoys me is that most of Brazil uses 220V/380 3-phase but for
rural SWER the power companies only allow installation of bi-phase
127V+127V.
That's very bad, because I need to buy 127V lamps in a state that is
primarily 220V and my 220V electric tools must be connected to
phase-phase 254V (15% more voltage, 33% power overload) risking damage.


Isaac


Em 16/4/2012 11:10, RussellMc escreveu:
>    BCC: JMC - Any of these in Vanuatu?
>
> 1st reference is useful in spelling out the basic factors of concern
> when designing an earth return power system.
> Thee is a little more magic to it than may meet the eye.
> Not something most people are liable to do very often. But ...
>
> SWER =3D Single Wire Earth Return power transmission is essentially just
> that. A single high voltage (say 10 kV to 30 kV) phase wire is used to
> distribute power and the return circuit  uses ground. While this at
> first and second blances may sound like very old technology (and it
> is) it is also still of great use in niche applications. Medium length
> rural distributions of moderate power requirement may still be most
> cost effectively served by SWER.
>
> I'm posting this mainly because of the excellent material in the first
> link below.
>
> http://www.stonepower.se/Images/SWER.pdf
>
>
> Distribution of Electrical Power to Rural Areas-
> Australian Experience and Implementation
> Possibility in Developing Countries
> http://www.iranenergy.org.ir/library/articles/5%20articles%20national%20e=
nergy%20congress/pdf/1406.pdf
>
>
> Wikipedia
> http://en.wikipedia.org/wiki/Single_wire_earth_return
>
>
> Sci,Eng
> http://groups.google.com/group/sci.engr.electrical.sys-protection/browse_=
thread/thread/5013cb01d9526811/3539d5ffb9062da4%3Fq%3D%2522High%2BVoltage%2=
522%233539d5ffb9062da4&ei=3DiGwTS6eaOpW8Qpmqic0O&sa=3Dt&ct=3Dres&cd=3D2&sou=
rce=3Dgroups&usg=3DAFQjCNFy3KmggWtXV7X5hmiPPWIADmQw1g?pli=3D1
>
>
> ________________________________
>
> This amused me, as an example test for the TECH / EE boundary is
> things you cannot/can build at home and a power station is mentioned
> as something that you (notionally) can't. . This is connected to a
> power station and is on the large side of DIY but the expressions
> given may indeed assist some DIY endeavours.
>
>
>
>
>              Russell McMahon
>

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