ABB RELION 670 SERIES Applications Manual page 541

1MRK 506 369-UUS -
Line distance protection REL670 2.2 ANSI
Application manual
RotResU: It is a setting for rotating the polarizing quantity (3V
parameter is set to 180 degrees by default in order to inverse the residual voltage (3V
calculate the reference voltage (-3V
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.
ANSI06000648 V1 EN
Figure 277: Characteristic for RCADir equal to 0°
The characteristic is for RCADir equal to -90° is shown in Figure 278.
-jRCADir
e ). Since the reference voltage is used as the
0
V
RCA = 0°, ROA = 90°
ref
3I
0
= ang(3I ) - ang(3V
0 ref
3I cos
0
en06000648_ansi.vsd
Current protection
) by 0 or 180 degrees. This
0
)
-3V =V
0 ref
Section 9
) to
0
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