ABB RELION REX640 Technical Manual page 1713

1MRS759142 C
REX640
Technical Manual
( U U U )
+ +
A B C
Uo
=
3
GUID-B5044391-5640-486C-9E19-C9E38CC58141 V1 EN
Sequence components
The phase-sequence current components are calculated from the phase currents
according to:
( I I I )
A + B + C
I
0 =
3
GUID-51DED510-5231-44D0-B206-B1591806283C V1 EN
2
( I a I a I )
A + ⋅ B + ⋅ C
I
1 =
3
GUID-4842AC14-E54E-4AA8-9EA7-146FFEE190F8 V1 EN
2
( I a I a I )
A + ⋅ B + ⋅ C
I
2 =
3
GUID-8A3C19EB-FC98-4EB7-9A94-0F226ECD9D16 V1 EN
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 )
A + B + C
U
0 =
3
GUID-CD2C77B5-AEC3-42DF-8A63-30339D983CA0 V1 EN
2
( U a U a U
+ ⋅ + ⋅
A B
U
=
1
3
GUID-A0763AF9-653A-453A-B4DD-9C0D75B5252C V1 EN
2
U a U a U
(
+ ⋅ + ⋅
A B
U
=
2
3
GUID-679FC475-BEA4-455E-A6D5-46402DD2EA38 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
U a U
( )
AB − ⋅ BC
U
=
1
3
GUID-00C7A68A-CEF3-4B12-ACF8-518DE0362568 V1 EN
( U a U )
AB − ⋅ BC
U
=
2
3
GUID-836FAB37-02DB-42EB-912B-D0C1D5DE71B9 V1 EN
The phase-to-earth voltages are calculated from the phase-to-phase voltages when VT
connection is selected as "Delta" according to the equations.
General function block features
)
C
)
C
Section 11
(Equation 367)
(Equation 368)
(Equation 369)
(Equation 370)
(Equation 371)
(Equation 372)
(Equation 373)
(Equation 374)
(Equation 375)
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