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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
C
0
3
=
+
+
(
) /
GUID-2319C34C-8CC3-400C-8409-7E68ACA4F435 V2 EN
(Equation 186)
I
I
a I
a
I
A
B
C
1
2
3
=
+ ⋅
+
⋅
(
) /
GUID-02E717A9-A58F-41B3-8813-EB8CDB78CBF1 V2 EN
(Equation 187)
I
I
a
I
a I
A
B
C
2
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
C
0
3
=
+
+
(
) /
GUID-49CFB460-5B74-43A6-A72C-AAD3AF795716-ANSI V1 EN
(Equation 189)
V
V
a V
a
V
A
B
C
1
2
3
=
+ ⋅
+
⋅
(
) /
GUID-7A6B6AAD-8DDC-4663-A72F-A3715BF3E56A-ANSI V1 EN
(Equation 190)
V
V
a
V
a V
A
B
C
2
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
BC
1
2
3
=
−
⋅
(
) /
GUID-70796339-C68A-4D4B-8C10-A966BD7F090C-ANSI V1 EN
(Equation 192)
V
V
a V
AB
BC
2
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
Содержание Relion 615 series
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