U
U
a U
a
U
A
B
C
1
2
3
=
+ ⋅
+
⋅
(
) /
(Equation 410)
U
U
a
U
a U
A
B
C
2
2
3
=
+
⋅
+ ⋅
(
) /
(Equation 411)
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
=
−
⋅
(
) /
(Equation 412)
U
U
a U
AB
BC
2
3
=
−
⋅
(
) /
(Equation 413)
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
/
(Equation 414)
U
U
U
U
B
BC
AB
=
+
−
(
)
0
/ 3
(Equation 415)
U
U
U
U
C
CA
BC
=
+
−
(
)
0
/ 3
(Equation 416)
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
=
−
(Equation 417)
U
U
U
BC
B
C
=
−
(Equation 418)
U
U
U
CA
C
A
=
−
(Equation 419)
1MRS759142 F
General function block features
REX640
Technical Manual
1911