ABB Relion REC670 Applications Manual page 145

1MRK 511 358-UEN A
IEC06000648 V4 EN-US
Figure 65: Characteristic for RCADir equal to 0°
The characteristic is for
IEC06000649 V3 EN-US
Figure 66: Characteristic for RCADir equal to -90°
OpMode is set to 3U03I0cosfi the apparent residual power component in the direction is
When
measured.
OpMode is set to 3I0 and fi the function will operate if the residual current is larger than
When
the setting
The characteristic for this
Application manual
RCADir
3I
0
j =
ang(3I ) ang(3U
0
×
3I cos
0
RCADir equal to -90° is shown in Figure 66.
U
ref
RCADir = −
3I
0
3 ⋅ I cos ϕ
0
ϕ = ang I (3 )
0
IEC06000649_3_en.vsd
INDir> and the residual current angle is within the sector RCADir ± ROADir .
OpMode when RCADir = 0° and ROADir = 80° is shown in figure 67.
o o
= =
0 , ROADir 90
-
)
ref
- =
3U U
0 ref
j
IEC06000648-4-en.vsd
 
90 , ROADir = 90
− ang U ( )
ref
− 3U
0
Section 7
Current protection
139