ABB RELION REX640, Техническое руководство, Страница: 1911 / 1960

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