Posted by MarkB_MI on November 05, 2019 at 12:06:04 from (174.228.0.67):
In Reply to: Re: Question for JohnT posted by Steve@Advance on November 05, 2019 at 07:47:05:
> I thought that was the reason Westinghouse pulled away from Edison, because DC could not be efficiently transmitted long distances.
> What changed? Doesn't DC tend to heat the conductors and loose efficiency over distance?
It's not true that DC can't be transmitted efficiently over long distance. You just have to get the voltage up, and that was the problem faced by Edison: He didn't have any practical way to step up or step down his DC power, while Tesla and Westinghouse could easily step up and step down AC using transformers. It wasn't until devices capable of switching and rectifying high voltage, high current power came along that DC transmission became practical.
In fact, high voltage DC is significantly more efficient to transmit than high voltage AC. Capacitance and inductance in the transmission lines aren't a factor for DC, and DC uses the whole conductor while AC tends to travel along the outside of a conductor. But the conversion of AC to DC and back costs a lot: the hardware is expensive and there are power losses associated with the conversion. So DC transmission is limited to fairly long distances, typically several hundred miles.
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