# Line voltages

1. May 31, 2004

### louie

If I'm considering a 3 phase line (25kV line-to-line voltage) that comes to a point and splits into single phase lines, what is the line voltage of one of the single phase lines ?

Does it remain 25 kV or is it 14.4 kV because you're only dealing with 1 phase and a neutral now ?

Any explanation would be great

Louie

2. Jun 1, 2004

### wwtog

Normally, they do not distribute L-N = Vl/sqrt(3)=14.4kV, only L-L =25kV. The phases can split AB, BC, CA. The single phase transformers convert 25K--> user voltage with the ground reference applied at the secondary neutral.

3. Jun 28, 2004

### anggoro_nuswantoro

A single phase line by definition is a circuit with only one phase. So you need a neutral side to create a loop. The voltage differential between the line and the neutral is, of course, +/- 14.4 kV and not 25 kV.

If you use both line (AB, AC, or BC) ..... I don't think that a single phase line. It may be within the category of two phase line :-)

aaNg

4. Jun 28, 2004

For distribution purpose only line voltages preferred so neutral is not used. And 25KV will not be splitted into single phase directly it will be step downed and than you will get a sinle phase line. sinle phase line voltage depends on the transformer rating.
rgds