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-   -   Questions about power grid in US (http://www.physicsforums.com/showthread.php?t=488599)

cuallito Apr8-11 07:03 PM

Questions about power grid in US
 
1) What's the voltage in the overhead power lines in residential areas? Basically how many volts is it before it gets stepped down to 120 for your house?

2) What's the typical primary inductance of a distribution transformer that does the stepping down?

berkeman Apr8-11 07:08 PM

Re: Questions about power grid in US
 
Quote:

Quote by cuallito (Post 3236755)
1) What's the voltage in the overhead power lines in residential areas? Basically how many volts is it before it gets stepped down to 120 for your house?

2) What's the typical primary inductance of a distribution transformer that does the stepping down?

This should help with your first question:

http://www.howstuffworks.com/environ...ergy/power.htm

.

cuallito Apr8-11 07:30 PM

Re: Questions about power grid in US
 
Quote:

Quote by berkeman (Post 3236758)
This should help with your first question:

http://www.howstuffworks.com/environ...ergy/power.htm

.

Thanks, so it's 7,200V.

Anyone know about the transformer? I imagine the inductance is huge!


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