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voltage of transmission is much higher than domestic? Answered

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seandogue
seandogue

5 years ago

It sure is. 700+ kV does not reach my door, that's for sure. See the other comments (and google it!) to see why.

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steveastrouk
steveastrouk

5 years ago

Actually high voltage DC transmission is the best system.....but DC conversion is expensive, and its only used on super long lines, like some of the US transcontinental lines.

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rickharris
rickharris

Answer 5 years ago

Arrrrg! Edison was right after all !!

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iceng
iceng

5 years ago

Power Max is correct about transmission lines.

High voltage low current AC power flow is the way to travel. The high voltage limit is when the power line made of aluminum wrapped steel wire begins to ionize the air surrounding the line and wasting transport energy. You may want to understand the hard to believe electrical skin effect !

Today there are enclosed insulated super material power lines that can run energy at even higher voltages however the cost is very prohibitive.

Ultimately a super conducting ie zero resistance power line will easily transmit huge power wherever we need.

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-max-
-max-

5 years ago

Yes, so that way power can be delivered more efficiently. Power is actually the product of current (how many electrons are being pushed through a wire per unit of time) and voltage (the force that pushes electrons from the negative end to the positive end.) Multiplying the 2 together you get power.

Since long tension lines have resistance, the more current that you push though it, the more it resists the flow by creating a voltage drop and that is power loss. If we need to deliver 100KW, then it does not make sense to push with 100V of force, and have 1KA of current go though the wires, because @ 1KA there will me a BIG voltage drop across the power lines, (heck they may start glowing red hot and droop and stretch lol) We can just as easily change the impedance of the load (transformer substations # of turns on primary) so that we have to push with 1000V of electricity in order to deliver only 100A, which is much more realistic!

Just keep upping the voltage to it's practical limit so that the current necessary to carry the required amount of power is less. Eventually you will be in the tens of thousands of volts, at only a few amps!!! That has to be converted down to a much more tame 110V before it goes inside your house since such ridiculously high voltages cause this:

https://www.youtube.com/watch?v=6GiIVze2Tac