ABB Relion REC615 - Page 830

U U U U
C CA BC
= + −
( )
0
/ 3
(Equation 101)
If the
U
0
channel is not valid, it is assumed to be zero.
The phase-to-phase voltages are calculated from the phase-to-earth voltages when
VT connection is selected as "Wye" according to the equations.
U U U
AB A B
= −
(Equation 102)
U U U
BC B C
= −
(Equation 103)
U U U
CA C A
= −
(Equation 104)
General function block features
1MRS758755 C
830 REC615 & RER615
Technical Manual