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Voltage at service

by rozilla
Tags: service, voltage
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rozilla
#1
Apr21-14, 03:22 PM
P: 2
Hi guys,

If there was a voltage drop of 20V on a 3ph line of 347/600, is the voltage at the service 327V or 580V, or both? Thanks you for reading.

RozilΩ
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phinds
#2
Apr21-14, 04:16 PM
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Is this a homework problem? What do YOU think the answer is, and why?
Baluncore
#3
Apr21-14, 04:38 PM
Sci Advisor
Thanks
P: 1,958
Who observed a voltage drop of 20V ?
How did they measure it ?

rozilla
#4
Apr21-14, 05:04 PM
P: 2
Voltage at service

Hi guys,

This isn't school related. That isn't the actual voltage - I'm trying to understand the concept of which would be the operating. With the concept, I can apply it accordingly. I assume it is 580 as it is three phase.
Baluncore
#5
Apr21-14, 05:57 PM
Sci Advisor
Thanks
P: 1,958
The specified voltage is 347V / 600V.
The three phases are separated by 120. 1 / Tan(30) = √3 = 1.73205
If you multiply 347V by √3 you get 600V.
You cannot change one without changing the other.

When combined with a common neutral you have three single phase supplies of 347V, relative to the neutral. The voltage between the phases is 600V.

A 20V single phase drop is a 34.6V three phase drop.
A 20V three phase drop is an 11.5V single phase drop.


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