ABB RELION Series, Техническое руководство

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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
A B C 0
3
= + +
( ) /
GUID-49CFB460-5B74-43A6-A72C-AAD3AF795716 V2 EN
(Equation 93)
U U a U a U
A B C 1
2
3
= + ⋅ + ⋅
( ) /
GUID-7A6B6AAD-8DDC-4663-A72F-A3715BF3E56A V2 EN
(Equation 94)
U U a U a U
A B C 2
2
3
= + ⋅ + ⋅
( ) /
GUID-6FAAFCC1-AF25-4A0A-8D9B-FC2FD0BCFB21 V1 EN
(Equation 95)
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:
U U a U
AB BC 1
2
3
= − ⋅
( ) /
GUID-70796339-C68A-4D4B-8C10-A966BD7F090C V2 EN
(Equation 96)
U U a U
AB BC 2
3
= − ⋅
( ) /
GUID-C132C6CA-B5F9-4DC1-94AF-FF22D2F0F12A V2 EN
(Equation 97)
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 98)
U U U U
B BC AB
= + −
( )
0
/ 3
GUID-9EB6302C-2DB8-482F-AAC3-BB3857C6F100 V1 EN
(Equation 99)
U U U U
C CA BC
= + −
( )
0
/ 3
GUID-67B3ACF2-D8F5-4829-B97C-7E2F3158BF8E V1 EN
(Equation 100)
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 101)
U U U
BC B C
= −
GUID-9BA93C77-427D-4044-BD68-FEE4A3A2433E V1 EN
(Equation 102)
U U U
CA C A
= −
GUID-DDD0C1F0-6934-4FB4-9F79-702440125979 V1 EN
(Equation 103)
Section 11
1MRS758755 A
General function block features
760 REC615 and RER615
Technical Manual