# Three phase circuits

ranju
In the given figures , what does the arrows denote , I mean what direction ??
VnR is upward in 1st fig. , VnR is towards left in 2nd fig. ( n is neutral here ) while in 3rd the line voltages are in anti-clockwise direction..!!
I wanted to know the pupose of this and why these directions only??

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## Answers and Replies

n.karthick
In the given figures , what does the arrows denote , I mean what direction ??
VnR is upward in 1st fig. , VnR is towards left in 2nd fig. ( n is neutral here ) while in 3rd the line voltages are in anti-clockwise direction..!!
I wanted to know the pupose of this and why these directions only??
The arrow denotes the sign of voltage induced in the winding when current flows in that direction. For example if current flows from terminal n to R, the voltage across the winding denoted by VnR is positive.

ranju
This means it is not a particular rule we can take this in opposite direction too ??
And what about the anti-clockwise direction of line voltages (VYR ,, VBY..) ??