Electric Cars Continue to Make Inroads

Zero is still zero.

But the rest of us are along for the ride.

DC transmission only pays on long distance hauls, with no intermediate drops. This is sort of the opposite of a grid.

So they'll bring DC to the house? Edison was right!

Plan to spend at least a day (two would be better) at the Naional Air Force Museum. The B-36 and XB-70 are truely amazing. They're oth

Use iron wire, too.

On Tuesday, January 3, 2017 at 10:09:07 AM UTC-8, Rob wrote: ...

It also has a lower peak voltage for a given power and so has lower corona losses.

One of the more important reasons is to interconnect regions where it is difficult to maintain the phase and frequency relationships necessary for stable operation of the grid.

For example between different countries and to connect regions within large countries such as the US.

The size of the US is such that it is about one wavelength at 60Hz - this makes it difficult to control as a single entity.

kevin

Current is limited by heat dissipation in the cables, and will probably sta y the same. Capacitatively induced currents will go up by a factor of two, but both inductive and capacitative radiation from from power lines are com ing from balanced dipoles and drop off very rapidly with distance, so the " scientist" being quoted is being just as alarmist as you'd judge from the " deadly" adjective.

I don't think that anybody has been proved to have been killed by having l ived close to a high voltage line. You've got to be fairly desperate to be willing to live close to a high voltage line, and that socio-economic secto r does have a relatively low life expectancy - particularly low in the US, where socio-economic gradients are steep - but establishing a causal relati onship hasn't yet been done, though some people claim differently.

Probably true. Also the anthropogenic global warming.

I already have a DC supply to the house, 48 volts on the phone line. Powers my phone just fine!

What was unclear about "Here they use DC for long lines"? Is "across the state of Florida" not a long line?

DC to the house will happen in the future. But for now, there are DC/AC converters. Picture a DC/AC converter for 700MW at 50Hz. They are made by Siemens. Probably a nice topic for sci.electronics.design?

DC to the house has become practical due to the ever increasing use of SMPS.

That is another advantage.

Given that they (Siemens) can make conversion stations that handle this kind of power (500MW-1GW for already deployed lines) I would not be surprised at all when they can make an AC/AC converter that will handle arbitrary phase differences in the grid.

No, but unless they're using it for something else (inter-grid tie), it seems foolish. Do you have the specifics?

Go for it.

It's still wastefull.

I posted the URL of the press publication about a new line.

Well I am interested in how those devices are built. Maybe someone here knows..?

Actually it is more efficient and that is why it is considered.

The line in Florida was three phase AC.