ABB Relion 670 series - Page 517

-3V
0
=V
ref
3I
0
RCA = 0°, ROA = 90°
= ang(3I
0
) - ang(3V
ref
)
3I
0
cos
en06000648_ansi.vsd
V
ref
ANSI06000648 V1 EN-US
Figure 266: RCADir set to 0°
-3V
0
3I
0
RCA = -90°, ROA = 90°
= ang(3I
0
) – ang(V
ref
)
3I
0
cos
V
ref
en06000649_ansi.vsd
ANSI06000649 V1 EN-US
Figure 267: RCADir set to -90°
For trip, the operating quantity 3I
0
cos φ, the residual current 3I
0
, and the residual voltage 3V
0
must be larger than the set levels : INCosPhiPU , INRelPU and VNRelPU . Refer to the simplified
logical diagram in Figure
271.
Trip from this function can be blocked from the binary input BLKTRDIR.
1MRK 502 066-UUS B Section 8
Current protection
511
Technical manual