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Tool Talk Discussion Forum

Re: Basic AC Power Systems

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Author  [Modern View]

04-24-2013 19:11:58

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Thanks for the answers,always interesting. Does three phase power date all the way back to the Tesla/Westinghouse days or did it develop later? I have stayed up late some nights reading the history of power generation/distribution on the web but can't recall about 3 phase. I know Tesla developed the AC 'Polyphase' system,among other things.

I believe that rural electrification was one of the greatest things that happened to country people. To country women for sure. I am told that around here(NW North Carolina) a lot of the dairy farms had 3 phase high leg power. There were over 100 dairy farms in my county in the 1950s, down to about 6 today.

This post was edited by GarryinNC at 19:17:26 04/24/13.

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John T

04-25-2013 06:47:45

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 Re: Basic AC Power Systems in reply to GarryinNC, 04-24-2013 19:11:58  
Youre really gettin into this stuff, neat...

I have no idea when 3 phase was first used commercially. I do know when it comes to motors its so much more efficient and self starting etc etc. At our plant any motor over 5 HP we tried to use 3 phase for lighter cheaper more efficient use.

I thought about joining the "Tesla Society" Back in the days he and Westinghouse and Edison really got into it I understand. I dont think things worked out that well for Tesla but he was a genius in his time. At Niagra Falls thay have a huge statue and a lot of history about him.

John T Tooo long retired EE but as I look back, ya know, "its been a good ride"

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Dusty MI

04-25-2013 09:42:05

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 Re: Basic AC Power Systems in reply to John T, 04-25-2013 06:47:45  
A 3 phase motor can be reversed instantly, that's so fast that you can't see it happen or see that it's turning the other way.

In most cases the voltage to ground is half of what the nominal is, that is if the voltage is 480 between the legs, it's 240 to ground. In a home 120/240, it's 120 to ground. It's surprising the Mr. home owner will try to work on something that's 120 but will not touch 240, even though he is more likely to get bit on one leg to ground, 120 volts.

Along that line the isolated/floating 3 phase that we were talking about, most often 480, if one leg does go to ground, then it's 480 from each of the other legs to ground.

Where as a 480 Y is 277 to ground.

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