ABB RELION 620 Series Technical Manual page 884

Section 12
General function block features
878
2
V = ( V + ⋅ a V + a V ⋅
1
A B C
GUID-7A6B6AAD-8DDC-4663-A72F-A3715BF3E56A-ANSI V1 EN
2
V = ( V + a V ⋅ + ⋅ a V
2
A B C
GUID-6FAAFCC1-AF25-4A0A-8D9B-FC2FD0BCFB21-ANSI 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
= − ⋅
V ( V a V ) / 3
1 AB BC
GUID-70796339-C68A-4D4B-8C10-A966BD7F090C-ANSI V1 EN
V = ( V − ⋅ a V ) / 3
2 AB BC
GUID-C132C6CA-B5F9-4DC1-94AF-FF22D2F0F12A-ANSI V1 EN
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 3 /
A 0 AB CA
GUID-1677DA47-81F3-4997-8D4D-5C955198C966 V1 EN
( )
V = V + V − V / 3
B 0 BC AB
GUID-BC8718B1-E189-4082-8F62-F46FF3215FDA V1 EN
( )
V = V + V − V / 3
C 0 CA BC
GUID-B4606B19-7510-461E-8A6B-9BFDF6F670DB V1 EN
If the channel is not valid, it is assumed to be zero.
Vo
The phase-to-phase voltages are calculated from the phase-to-ground voltages when VT
connection is selected as "Wye" according to the equations.
V = V − V
AB A B
GUID-A2287CBF-D979-44CD-91ED-8CEBD120F1D8 V1 EN
= −
V V V
BC B C
GUID-752436ED-0955-4C59-80C8-22DACEDE65D7 V1 EN
V = V − V
CA C A
GUID-4AE4B43A-B0A7-41DE-9C84-55527D9F6D78 V1 EN
) / 3
) / 3
1MAC504801-IB E
(Equation 123)
(Equation 124)
(Equation 125)
(Equation 126)
(Equation 127)
(Equation 128)
(Equation 129)
(Equation 130)
(Equation 131)
(Equation 132)
620 series ANSI
Technical Manual