ABB REC650 Applications Manual page 130

Section 6
Current protection
124
The function can be set Enabled/Disabled with the setting of Operation.
With the setting OpModeSel the principle of directional function is chosen.
With OpModeSel set to 3I0cosfi the current component in the direction equal to the
characteristic angleRCADir has the maximum sensitivity. The characteristic for RCADir
is equal to 0° is shown in figure 54.
ANSI06000648 V1 EN
Figure 54: Characteristic for RCADir equal to 0°
The characteristic is for RCADir equal to -90° is shown in figure 55.
V
RCA = 0°, ROA = 90°
ref
3I
0
) - ang(3V
= ang(3I
0 ref
3I cos
0
en06000648_ansi.vsd
1MRK 511 286-UUS A
)
-3V =V
0 ref
Application manual