Sequence components
The phase-sequence current components are calculated from the phase currents
according to:
I
I
I
I
A
B
C
0
3
=
+
+
(
) /
(Equation 91)
I
I
a I
a
I
A
B
C
1
2
3
=
+ ⋅
+
⋅
(
) /
(Equation 92)
I
I
a
I
a I
A
B
C
2
2
3
=
+
⋅
+ ⋅
(
) /
(Equation 93)
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
=
+
+
(
) /
(Equation 94)
U
U
a U
a
U
A
B
C
1
2
3
=
+ ⋅
+
⋅
(
) /
(Equation 95)
U
U
a
U
a U
A
B
C
2
2
3
=
+
⋅
+ ⋅
(
) /
(Equation 96)
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 97)
U
U
a U
AB
BC
2
3
=
−
⋅
(
) /
(Equation 98)
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 99)
U
U
U
U
B
BC
AB
=
+
−
(
)
0
/ 3
(Equation 100)
1MRS758755 C
General function block features
REC615 & RER615
Technical Manual
829
Содержание Relion REC615
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