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#128596 07/01/03 05:20 AM
Joined: May 2003
Posts: 107
J
james S Offline OP
Member
Iknow the power calculation for three phase delta or star is
p=3VL*IL*PF

(with the three sqaure rooted)
but why is it sqaure rooted and not cube rooted given that there is three coils or three spaces between the coils?or is this used for the time loss between each coil?

also if anyone knows how to express the correct symbol for sqaure rooted would be much appreciated!

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#128597 07/01/03 10:01 AM
Joined: Apr 2002
Posts: 2,527
B
Moderator
Don't know of a way to display the root symbol in "ubb code" for this site.

[Linked Image from 64.146.180.232]

As for why root 3, check your library for basic AC power-systems texts.

#128598 07/01/03 10:02 PM
Joined: Mar 2002
Posts: 582
R
Ron Offline
Member
The "root 3" comes from the vectorial addition of (2) phase to neutral voltages which are 120 degrees out of phase with each other.
You'll have to dig out your (mine too) old high school physics book to prove it to yourself.

[This message has been edited by Ron (edited 07-01-2003).]


Ron
#128599 07/01/03 11:34 PM
Joined: Aug 2002
Posts: 1,081
T
Member
√

#128600 07/02/03 12:54 AM
Joined: Apr 2002
Posts: 2,527
B
Moderator
ã ã ã ã

TG -- You have the magic touch. Mine blow up.




[This message has been edited by Bjarney (edited 07-02-2003).]

#128601 07/02/03 09:37 AM
Joined: Aug 2002
Posts: 1,081
T
Member
The way to display it is to use the "character entity" in HTML, which is &#8730&#059; -- that's ampersand, number sign, 8, 7, 3, 0, semicolon.

So you would type 2√ in your message to display 2ã

Hope that helps.

Edit: It was fun figuring out how to get the message to show &#8730&#059; rather than √

[This message has been edited by ThinkGood (edited 07-02-2003).]

#128602 07/02/03 10:46 AM
Joined: Apr 2002
Posts: 2,527
B
Moderator
Amazing, TG. Thanks.

I'd hit a brick wall with alt-251, but that's from the ancient days of "Wordstar".

You can learn something new every day. First it's these crazy computers. Then, that insane internet, to boot.

#128603 07/02/03 09:35 PM
Joined: Aug 2002
Posts: 1,081
T
Member
Quote
So you would type 2√ in your message to display 2ã
I have no idea what happened to that line [Linked Image]

#128604 08/23/03 09:07 PM
Joined: Aug 2003
Posts: 123
P
Member
Testing: &#8730
Edit: Hey it worked! Better than ^-1/2

[This message has been edited by Pinemarten (edited 08-23-2003).]

[This message has been edited by Pinemarten (edited 08-23-2003).]

#128605 09/09/03 10:17 AM
Joined: May 2002
Posts: 202
J
Member
ã
do you just know this stuff or do you have a list or something that you can pass on

[This message has been edited by jlhmaint (edited 09-09-2003).]

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