On 06/15/2016 10:02 PM, D. Hugh Redelmeier via talk wrote:
| From: Alvin Starr via talk <talk@gtalug.org>
| Actually the static power loss goes down as the voltage goes up. | | So for example if the streetcar draws 600W at 600V then the current draw is 1A | but at 750V the current draw is 0.8 amps. | The overhead line losses are directly proportional to the current flowing | through them so there would be roughly a 20% decrease in power loss in the | wires. | | With an electrical bill like the TTC must have a 20% decrease would be a | significant amount of money.
I'm no EE, but here's my guess.
Energy losses are proportional to the square of the current and thus the square of the inverse of the voltage. (750/600)^2 = 1.5625 So they would save more than a third of the transmission losses.
I have no idea how much their transmission losses are as a proportion of the electrical power used. It has been way too long since I have done any power calculations and I believe your right. Looks like its time to brush up on my math skills.
-- Alvin Starr || voice: (905)513-7688 Netvel Inc. || Cell: (416)806-0133 alvin@netvel.net ||