Delta connection

[Omer]

What is the (angle) relation between line current and phase current in a delta connection?

and does the line current direction make any difference in this relation? I mean, Line current flowing in- Line current flowing out.

 

[FPar]

The line current is SQRT(3) times the phase current and is 30 degrees behind. The exact opposite for the line/phase voltage in the Y connection.

Do you have the Stevenson's Power System book? (1994) In chapter 1 section 1.8 you will find two really good phasor diagrams. Once you see them you won't get confused.

 

[rg1]

Draw the phase quantities first and then take differences of phase quantities to find line quantities. What ever comes comes. It will also depend on sequence etc, so take care but for sequence ABC yes the above statements  are true.