RotResU: It is a setting for rotating the polarizing quantity (3V
0
) by 0 or 180 degrees. This
parameter is set to 180 degrees by default in order to inverse the residual voltage (3V
0
) to
calculate the reference voltage (-3V
0
e
-jRCADir
). Since the reference voltage is used as the
polarizing quantity for directionality, it is important to set this parameter correctly.
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
277.
-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
Figure 277: Characteristic for RCADir equal to 0°
The characteristic is for RCADir equal to -90° is shown in Figure 278.
1MRK 506 369-UUS - Section 9
Current protection
Line distance protection REL670 2.2 ANSI 535
Application manual
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