ABB Relion 670 Series Applications Manual page 152

Section 8
Current protection
ANSI06000649 V1 EN-US
Figure 67: Characteristic for RCADir equal to -90°
OpModeSel is set to 3I03V0Cosfi the apparent residual power component in the direction is
When
measured.
When OpModeSel is set to 3I0 and fi the function will operate if the residual current is larger than
the setting
The characteristic for this
ANSI06000652 V2 EN-US
Figure 68: Characteristic for RCADir = 0° and ROADir = 80°
146
RCA = -90°, ROA = 90°
V
ref
3I
0
3I cos
0
= ang(3I
INDirPU and the residual current angle is within the sector RCADir ± ROADir .
OpModeSel when RCADir = 0° and ROADir = 80° is shown in figure 68.
RCA = 0º
ROA = 80º
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)
) – ang(V
0 ref
-3V
0
en06000649_ansi.vsd
Operate area
3I
0
V =-3V
ref 0
ANSI06000652-2-en.vsd
1MRK 511 407-UUS Rev. J
Phasor measurement unit RES670
Application manual