ABB RELION Series Technical Manual page 766

Section 11
General function block features
760
The phase-sequence voltage components are calculated from the phase-to-earth
voltages when VT connection is selected as "Wye" with the equations:
U ( U U U ) / 3
0 = A + B + C
GUID-49CFB460-5B74-43A6-A72C-AAD3AF795716 V2 EN
2
U ( U a U a U
= + ⋅ + ⋅
1 A B
GUID-7A6B6AAD-8DDC-4663-A72F-A3715BF3E56A V2 EN
2
U ( U a U a U
= + ⋅ + ⋅
2 A B
GUID-6FAAFCC1-AF25-4A0A-8D9B-FC2FD0BCFB21 V1 EN
When VT connection is selected as "Delta", the positive and negative phase sequence
voltage components are calculated from the phase-to-phase voltages according to the
equations:
2
( ) / 3
U U a U
= − ⋅
1 AB BC
GUID-70796339-C68A-4D4B-8C10-A966BD7F090C V2 EN
( ) / 3
U U a U
= − ⋅
2 AB BC
GUID-C132C6CA-B5F9-4DC1-94AF-FF22D2F0F12A V2 EN
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
C
) / 3
C
3 /
/ 3
/ 3
1MRS758755 A
(Equation 93)
(Equation 94)
(Equation 95)
(Equation 96)
(Equation 97)
(Equation 98)
(Equation 99)
(Equation 100)
(Equation 101)
(Equation 102)
(Equation 103)
REC615 and RER615
Technical Manual