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Superconducting Power Grid Launches In New York
EmagGeek writes "IEEE is running a story about a new superconducting power grid that was energized in April in New York State. The lines operate at 138kV and are cooled to 65-75K to maintain superconductivity. These lines are run underground and can carry 150 times more electricity than copper lines of the same cross section. The project is funded with taxpayer dollars through the Department of Energy."
A related story at MarketWatch indicates that this is part of a large-scale effort to upgrade aging infrastructure.
Besides economics, another advantage the company is touting is that the cables can prevent fault currents, surges that are caused by grid-scale short circuits. Superconductors have an inherent current-limiting ability in that if the current increases past a certain threshold, they lose their superconducting abilities and become normally resistive, damping the current.
Hmm, interesting, but there's more. simply follow the links in TFA and you'll come to these:
"So there's been a stir over the disclosure that AMSC is under investigation by the office of Representative John Dingell, a Democratic congressman from Michigan, one of the most influential U.S. legislators, and an aggressive inquisitor."
"The incident that aroused Dingell's suspicions was the award in 2006 by the U.S. Department of Homeland Security of a multi-million dollar no-bid contract to AMSC to develop and test what it's calling Secure Super Grids in New York City. Working with the local utility Consolidated Edison Co., AMSC plans to develop and install superconducting cables that would connect substations in a much tighter mesh, so that if stations or feeder cables fail, power can be instantly rerouted. Feeder cable failures were implicated in the 1999 and 2006 New York City neighborhood blackouts."
Wow, I didn't know the DHS was responsible for awarding no-bid contracts to energy interests. There ain't no business like no-bidness!
Maybe the US will now leapfrog from an antiquated power distribution system to the most advanced in the world. Maybe. One positive aspect of this is the reduction of energy loss due to the superconductivity. This may also allow long distance lines to be run (even though the cooling will be a problem) which might help balance out the grid when needed.
According to Wikipedia, super conducting cables will use roughly half the energy saved for cooling, but since losses are around 7%, that's still a rather high amount of energy saved.
Well, in a perfect world (we can at least hope) lines would be kept a bit below theoretical optimum temperature and surrounded with some high thermal mass cladding within the insulation. That would at least buy some time for the system to get repaired. Since you're dealing with a cylindrical cross-section your surface area to volume ratio is at least as good as it can get to minimize heating.
There are many, many ways to build a system to manage loss of coolant, nuclear reactor scrambles being obvious extreme versions. Some of these approaches could be used in a case like this. But we're dealing with Con Ed here, the guys who neglected maintenance such that we ended up having three major blackouts in ten years. So I'm not optimistic. The only thing that we should remember is that at least in theory such problems are somewhat addressable, not least by just the kind of rerouting that this system is supposed to make much easier and faster.
It's all about the information. And what we do with it.
People have been blowing up conventional electricity pylons for decades. They make great targets because a single tower collapse takes out the whole circuit. Of course we call them 'heroes' not 'terrorists', but the principle is the same: http://query.nytimes.com/gst/fullpage.html?res=9501EFDC1330F935A15757C0A9669C8B63&sec=&spon=
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In a standard copper line the value is zero: we don't cool them
Conventional underground transmission lines are oil cooled. Superconducting transmission lines have almost zero resistance and should require less cooling once they reach working temperature.
http://michaelsmith.id.au
You might want to ask anyone who's ever been in a MRI why the dang thing works at all without it's superconducting super magnets.
According to Wikipedia and your information, MRIs generally use Liquid helium to cool things down to 4K. That's not a high temperature even in the superconductor world.
oh hey, and what about the maglev train in japan, or various ones in germany?? do you honestly think that doing magleg based on normal electromagnets would be energy efficient?
Only one major Maglev line, the JR-Maglev, uses high temperature superconductors. JR-Maglev is not commercial; it's just research. Currently, there are two major commercial Maglevs, neither of which use high temperature superconductors (let alone any superconducting at all).
These are the reasons I felt that high temperature superconducting is vaporware. It gets a lot of research and demos, but not much real world application. The Japan demo maglev is close, but it was never put in large scale or commercial use. The power grid in TFA seems to be one of the first mass commercial uses of superconducting used. YMMV, someone point out my fail if there have been more uses of high temperature superconductivity in the public space.
High voltage AC transmission lines are famously inductive, such that transmission line workers where metal mesh in their suits so they don't get the weird feeling of the oscilating magnetic field through their bodies.
That's wild... it is news to me that humans are able to directly perceive even very strong magnetic fields. For example, I don't think patients feel anything when undergoing an MRI procedure. Can you cite a source for this information? Thanks
That that is is that that that that is not is not.
I'm from the area (very close to said power plant) so I figured I could clarify on why Long Island is the NIMBY capital of the world:
There are very few rivers and streams on Long Island, and most of them are in located in parks or protected woodlands. This means that almost all the drinking water for LI residents comes from ground water - most of it is contained in large underground aquifers.
Nuclear catastrophes usually involve radioactive material finding its way into the ground - and eventually the groundwater. This is a very unlikely scenario, but if it happened the outcome would be devastating. Houses here tend to be very expensive (compared to other parts of the country) and land values are always on the rise, which makes them a great investment for many residents who plan to sell their houses years down the road, move somewhere cheaper, and live off the difference. Any contamination of the groundwater would make housing values plummet and stay that way for a very, very long time. This is just not a risk that homeowners here are willing to take for a tiny decrease in electricity costs. Whether or not they are well-informed is a different issue.
Add in the fact that shipping in drinking water from anywhere would be very difficult/expensive and a major evacuation of the island could take weeks. Both of these go double for the eastern parts of the island where there are few/no highways/ports. A major hurricane here would put New Orleans to shame.