Posted by ChrisB on February 20, 2008 at 06:54:30 from (71.88.106.1):
In Reply to: OT Power Co Rant posted by Trkr on February 19, 2008 at 18:20:19:
MN Scott said: (quoted from post at 10:25:14 02/20/08) Well our local coop is switching over to the new auto reader meters and they DO read over the power lines. I can show you the brocure they sent use explaining the process. We no longer have to report power outages because the computer in the home office senses when it loses contact with our meter. Also rural cable tv service is avaiable thru the electric power lines and they are considering high speed internet.
Scott,
That is indeed new technology, but is done at that last mile (usually under 7200 volts) and collected in a central location (substation usually) not all the way back to the electrical company. Not many installs as of yet and is rare. Done in remote locations now for obvious reasons (fuel) but might be more common.
They use couplers at the transformers for the signal to transverse them. Transformers in simple forms are two coils with an air gap between them that no low voltage (meter reading or internet) can get across. Thus the need for couplers.
The idea of internet and TV across power lines have been around before internet and cable were common. Challenge is the largest power cable on a grid cannot carry the bandwidth that coaxial cable provides in any efficient manner. Cheaper to string a new coaxial cable (and now glass) then mess with power lines.
Cabletron (inventor of broadband over cable) look at both solutions but too many hurdles using the power grid and not enough bandwidth.
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