[GTALUG] mysterious restarts

[Alvin Starr]

On 06/15/2016 10:02 PM, D. Hugh Redelmeier via talk wrote:
> | From: Alvin Starr via talk <talk at 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 at netvel.net              ||

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