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The $2.5 Billion U.S. Power Line That No State Can Stop
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Mar 27, 2016 21:29:04   #
gmcase Loc: Galt's Gulch
 
f8bengal wrote:
Not a 700 mile DC power line!! How many times do they have to prove that Edison was wrong about DC current, and that AC transmission is the only way to go? Do we have to have to have the Chicago World's Fair all over again? Resistance losses in a DC line that distance won't leave enough juice to run a one-slice toaster by the time it gets to Tennessee. Not only that but Tennessee is still running on depression-era TVA dam projects and cut-rate power rates that the rest of us are still paying for.
Not only that but the enviro-wackos stopped another hydro dam in Tennessee because it might upset a 2" long minnow call the snail darter. So, now Oklahoma is going to kill millions of eagles and other endangered birds so that Tennessee won't have to irritate the snail darters, pay much higher power rates for the privilege and still have to have redundant coal/gas power on standby. Doing nothing.
Am I sounding cynical?
Not a 700 mile DC power line!! How many times do ... (show quote)


Not cynical at all but rationally skeptical, in my opinion. Tesla had it nailed long ago.

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Mar 27, 2016 21:45:52   #
BamaTexan Loc: Deep in the heart of Texas
 
thomseninc wrote:
I may be 30+ years removed from betting my BSEE and MSEE, but 4000MW of power on a 600 kV line (DC) is going to take 6,666 amps of current. Who is confident that the crack regulators at the DOE have fully considered the impact of the MONSTROUS magnetic field that will surround these transmission lines.


But, they are from the gubment, aren't they supposed to help? :lol:

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Mar 28, 2016 01:21:00   #
DaFox
 
f8bengal wrote:
Not a 700 mile DC power line!! How many times do they have to prove that Edison was wrong about DC current, and that AC transmission is the only way to go? Do we have to have to have the Chicago World's Fair all over again? Resistance losses in a DC line that distance won't leave enough juice to run a one-slice toaster by the time it gets to Tennessee. Not only that but Tennessee is still running on depression-era TVA dam projects and cut-rate power rates that the rest of us are still paying for.
Not only that but the enviro-wackos stopped another hydro dam in Tennessee because it might upset a 2" long minnow call the snail darter. So, now Oklahoma is going to kill millions of eagles and other endangered birds so that Tennessee won't have to irritate the snail darters, pay much higher power rates for the privilege and still have to have redundant coal/gas power on standby. Doing nothing.
Am I sounding cynical?
Not a 700 mile DC power line!! How many times do ... (show quote)


The reason that AC if preferred over DC for transmitting electrical power is that AC is cheaper and simpler to increase or decrease voltage for transmission and usage. A simple transformer will do that. So, long transmission lines utilize very high AC voltages for transmission (reducing current thus reducing transmission losses for equal power delivery). Whether AC or DC, equal current will produce basically equal transmission losses. Double the voltage, and you reduce the current by half for a given power transfer, thus reducing transmission losses.

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Mar 28, 2016 01:32:32   #
DaFox
 
DaFox wrote:
The reason that AC if preferred over DC for transmitting electrical power is that AC is cheaper and simpler to increase or decrease voltage for transmission and usage. A simple transformer will do that. So, long transmission lines utilize very high AC voltages for transmission (reducing current thus reducing transmission losses for equal power delivery). Whether AC or DC, equal current will produce basically equal transmission losses. Double the voltage, and you reduce the current by half for a given power transfer, thus reducing transmission losses.
The reason that AC if preferred over DC for transm... (show quote)

The 700 mile DC power line that started all this is reducing line losses by transmitting very high voltage, so that transmission current is very low, thus line losses will be very low. Why DC was chosen is probably due to the economics of wind turbine generators.

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Mar 28, 2016 08:46:12   #
f8bengal Loc: West Nawth Carolinah
 
Fox: "Why DC was chosen is probably due to the economics of wind turbine generators."
Okay, let's assume that wind turbines crank out DC, but not at 600,000 volts. So, it has to go thru an inverter to make AC so it can be stepped up to 600 kv. Then back through a rectifier to get DC back. Once it gets to Tennessee the process has to be reversed in order go get usable AC. Every piece of hardware put in the line has resistance and costs power. Makes no sense.



DaFox

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Mar 28, 2016 11:11:52   #
thomseninc
 
DaFox wrote:
I believe that 4000MW is 4,000,000,000 watts (MW equal million watts) Now, do the math: i=600KV divided by the 4,000MWs.


This is just crazy. Your formula is wrong. Power (in watts) = voltage times current (for a DC circuit). Current = power divided by voltage. Enough.

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Mar 28, 2016 21:23:20   #
tainkc Loc: Kansas City
 
bdo wrote:
Your source of information for that assertion?
I just made it up. It seems like this is the way things are going in this country.

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Mar 28, 2016 22:35:50   #
dirtpusher Loc: tulsa oklahoma
 
tainkc wrote:
I just made it up. It seems like this is the way things are going in this country.


:thumbup: :thumbup: :thumbup: :thumbup:

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Mar 29, 2016 00:01:21   #
Harvey Loc: Pioneer, CA
 
dirtpusher wrote:
http://www.bloomberg.com/news/articles/2016-03-25/the-2-5-billion-u-s-transmission-line-that-no-state-can-stop


I too opened this highly interesting NEWS item as soon as I saw it- my impression is that it is a good idea - here is my thoughts and input.

I am quite sure the companies have gleaned the best wind turbines, and transmit ion modes that have been developed over the past years. Much has been learned from the time of the first wind farms 30+ years ago up to the new ones I see today- yes the shorter-fast turning-4 bladed BIRD KILLERS have been slowly fazed out and the super tall slow turning/BIRD FRIENDLY - much more efficient in power generating giants are now churning out greatly needed cheaper power here in CA about 30 to 50 mi inland from San Francisco, CA .
Now as for the discussion on the best means of transmition I again have to go with the folks who are putting this venture in place by using the best methods they could glean from the newer wind farms around the word - not just here in the USA.
In my estimation these sidewalk engineers/naysayers who don't have any true knowledge of this modern technology are just $h-t disturbers

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