ABB REL650 Applications Manual page 226

Section 7
Current protection
220
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 110.
ANSI06000648 V1 EN
Figure 110: Characteristic for RCADir equal to 0°
The characteristic is for RCADir equal to -90° is shown in figure 111.
V
RCA = 0°, ROA = 90°
ref
3I
0
) - ang(3V
= ang(3I
0 ref
3I cos
0
en06000648_ansi.vsd
1MRK 506 334-UUS A
)
-3V =V
0 ref
Application manual