DC Transmission


Awl --
In the thread where the guy was ranting against alternating current in his house, Iownuass wrote:
MB Hydro uses DC for transmission from generator sites to converter stations over hundreds of miles.
http://www.hydro.mb.ca/corporate/facilities/ts_nelson.shtml
So I emailed them for a few more details, and they wrote back the following:
------------------- HVDC transmission from Manitoba Hydro's Northern generation region to the Southern load center is preferred over HVAC transmission based primarily on economics.
It is well documented that for transmission lengths exceeding approximately 600km, HVDC transmission becomes economically competitive with HVAC transmission. As distances increase the economic benefits associated with HVDC versus HVAC transmission increase. The magnitudes of these benefits are unique to design characteristics and requirements of each particular transmission link.
Some HVDC benefits which attribute to improved economics are; simpler line construction, greater power per conductor, only two conductors required, no line compensation required...etc.
In addition to these economic benefits there are a number of technical and operational benefits that make HVDC transmission attractive for long distances.
* * * * * *
As for the Nelson River, development began in 1966. It was connected to Manitoba's provincial power system in 1967. The Nelson River HVDC line (also known as Bipole 1) was first energized in 1971.
-----------------------------------
Who'da thunk??? Curious that distance is one of the main factors.
So Edison (who would proly have invented Enron, given the chance), was partially right, but for the wrong reasons.
Next, holy shit, this technology was implemented in 1971 !!!!! Which mean it was proly in the works from 1961 !!
The above link also offers a brochure.
Gotta love Canada!!! Where ahm movin!!
--
EA



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Existential Angst wrote: ...

...
Been going that way for quite some time once solid-state devices capable of the HV boost became available.
...

Ain't only there, Potomac Electric has a line under construction on the peninsula and there are others on the way.
--
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That is because the benefits of DC transmission depends on the length of transmission (simpler, lower cost transmission lines for a given power level), while the cost is at each end, in the form of the expensive AC to DC conversion equipment.
BTW, for underwater transmission, the benefit is much higher, because underwater lines are metallically sheathed, and therefore AC lines have significant losses from the capacitive coupling with the sheath. So for underwater lines the tradeoff begins to favor DC at much shorter distances.
Cheers, Wayne
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