ABB REF615 E - Page 848

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 AB CA
= + −
( )
0
3/
GUID-8581E9AC-389C-40C2-8952-3C076E74BDEC V1 EN (Equation 120)
U U U U
B BC AB
= + −
( )
0
/ 3
GUID-9EB6302C-2DB8-482F-AAC3-BB3857C6F100 V1 EN (Equation 121)
U U U U
C CA BC
= + −
( )
0
/ 3
GUID-67B3ACF2-D8F5-4829-B97C-7E2F3158BF8E V1 EN (Equation 122)
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
= −
GUID-674F05D1-414A-4F76-B196-88441B7820B8 V1 EN (Equation 123)
U U U
BC B C
= −
GUID-9BA93C77-427D-4044-BD68-FEE4A3A2433E V1 EN (Equation 124)
U U U
CA C A
= −
GUID-DDD0C1F0-6934-4FB4-9F79-702440125979 V1 EN (Equation 125)
Section 11 1YHT530004D05 D
General function block features
842 615 series
Technical Manual