ABB RELION 670 SERIES Applications Manual page 542

Section 9
Current protection
536
V
ref
3I cos
0
ANSI06000649 V1 EN
Figure 278: Characteristic for RCADir equal to -90°
When OpModeSel is set to 3I03V0Cosfi the apparent residual power component in the
direction is measured.
When OpModeSel is set to 3I0 and fi the function will operate if the residual current is
larger than the setting INDirPU and the residual current angle is within the sector RCADir
± ROADir.
The characteristic for this OpModeSel when RCADir = 0° and ROADir = 80° is shown in
figure 279.
RCA = -90°, ROA = 90°
3I
0
)
) – ang(V
= ang(3I
0 ref
-3V
0
en06000649_ansi.vsd
Line distance protection REL670 2.2 ANSI
1MRK 506 369-UUS -
Application manual