ABB RELION 611 Series Technical Manual page 496

Section 9
General function block features
490
The phase-to-earth voltages are calculated from the phase-to-phase voltages when VT
connection is selected as "Delta" according to the equations.
U U U U
( )
A 0 AB CA
= + −
GUID-8581E9AC-389C-40C2-8952-3C076E74BDEC V1 EN
U U U U
( )
B 0 BC AB
= + −
GUID-9EB6302C-2DB8-482F-AAC3-BB3857C6F100 V1 EN
U U U U
( )
C 0 CA BC
= + −
GUID-67B3ACF2-D8F5-4829-B97C-7E2F3158BF8E V1 EN
If the channel is not valid, it is assumed to be zero.
U
0
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
= −
GUID-674F05D1-414A-4F76-B196-88441B7820B8 V1 EN
U U U
BC = B − C
GUID-9BA93C77-427D-4044-BD68-FEE4A3A2433E V1 EN
U U U
CA = C − A
GUID-DDD0C1F0-6934-4FB4-9F79-702440125979 V1 EN
3 /
/ 3
/ 3
1MRS757454 D
(Equation 61)
(Equation 62)
(Equation 63)
(Equation 64)
(Equation 65)
(Equation 66)
611 series
Technical Manual