ABB RED615 Technical Manual page 848

Section 11
General function block features
842
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
1YHT530004D05 D
(Equation 120)
(Equation 121)
(Equation 122)
(Equation 123)
(Equation 124)
(Equation 125)
615 series
Technical Manual