ABB 615 Series - Page 1134

The residual voltage is calculated from the phase-to-ground voltages when the VT
connection is selected as “Wye” with the equation:
Vo V V V
A B C
= + +( )
GUID-4E68CD47-9DBB-4DAD-A092-BD69DA5863F3 V1 EN (Equation 185)
Sequence components
The phase-sequence current components are calculated from the phase currents according
to:
I I I I
A B C0
3= + +( ) /
GUID-2319C34C-8CC3-400C-8409-7E68ACA4F435 V2 EN (Equation 186)
I I a I a I
A B C1
2
3= + ⋅ + ⋅( ) /
GUID-02E717A9-A58F-41B3-8813-EB8CDB78CBF1 V2 EN (Equation 187)
I I a I a I
A B C2
2
3= + ⋅ + ⋅( ) /
GUID-80F92D60-0425-4F1F-9B18-DB2DEF4C2407 V2 EN (Equation 188)
The phase-sequence voltage components are calculated from the phase-to-ground
voltages when VT connection is selected as “Wye” with the formulae:
V V V V
A B C0
3= + +( ) /
GUID-49CFB460-5B74-43A6-A72C-AAD3AF795716-ANSI V1 EN (Equation 189)
V V a V a V
A B C1
2
3= + ⋅ + ⋅( ) /
GUID-7A6B6AAD-8DDC-4663-A72F-A3715BF3E56A-ANSI V1 EN (Equation 190)
V V a V a V
A B C2
2
3= + ⋅ + ⋅( ) /
GUID-6FAAFCC1-AF25-4A0A-8D9B-FC2FD0BCFB21-ANSI V1 EN (Equation 191)
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:
V V a V
AB BC1
2
3= − ⋅( ) /
GUID-70796339-C68A-4D4B-8C10-A966BD7F090C-ANSI V1 EN (Equation 192)
V V a V
AB BC2
3= − ⋅( ) /
GUID-C132C6CA-B5F9-4DC1-94AF-FF22D2F0F12A-ANSI V1 EN (Equation 193)
The phase-to-ground voltages are calculated from the phase-to-phase voltages when VT
connection is selected as "Delta" according to the equations.
V V V V
A AB CA
= + −
( )
0
3/
GUID-1677DA47-81F3-4997-8D4D-5C955198C966 V1 EN (Equation 194)
Section 11 1MAC059074-MB A
General function block features
1128 615 series ANSI
Technical Manual