# how to convert 3 phase voltage to a magnitude???

#### iceman11

Joined May 4, 2007
39
good day all, this is a simple question, but i jst cant find the answer to it : if i have a 3 phase line, but i wish to extract a single magnitude THAT IS EQUIVALENT to the 3 phase voltages how to i do that??

i know that there is some formula to do this? but i cant find it??

it is basically an amplitude calculator for all three line phase/line voltages

thanks

#### Externet

Joined Nov 29, 2005
1,544
If the voltages of the 3 phases are identically divided to a level that can be handled by a summer circuit, that would yield a proportional value. (But it will not reveal which one is the weakest nor the strongest phase)
(Like a microphone mixer circuit)
Miguel

#### SgtWookie

Joined Jul 17, 2007
22,220
good day all, this is a simple question, but i jst cant find the answer to it : if i have a 3 phase line, but i wish to extract a single magnitude THAT IS EQUIVALENT to the 3 phase voltages how to i do that??

i know that there is some formula to do this? but i cant find it??

it is basically an amplitude calculator for all three line phase/line voltages

thanks
AVERAGE of:
Potential A times sine (0 degrees)
Potential B times sine (120 degrees)
Potential C times sine (240 degrees)

What do you get?

If life is perfect, zero volts. However, life is seldom perfect.

#### iceman11

Joined May 4, 2007
39
AVERAGE of:
Potential A times sine (0 degrees)
Potential B times sine (120 degrees)
Potential C times sine (240 degrees)

What do you get?

If life is perfect, zero volts. However, life is seldom perfect.

hey, thanks,

but wudnt this mean that the magnitude contributed by the "phase A line" will always be 0, since sine 0 deg is 0...

this means that this wud contribute nothing to the overall magnitude...which is obviously not true

#### scubasteve_911

Joined Dec 27, 2007
1,203
The average of any time-harmonic signal is zero, but not true for the products.

Steve

#### raybo

Joined Oct 18, 2008
22
add diodes to each phase so you get rectify DC that is something that you can measure for sure . loose a line you will know. simple .