ABB Relion 670 Series Applications Manual page 172

Section 8
Current protection
OpMode set to 3I0cosfi the current component in the direction equal to the characteristic
With
angle RCADir has the maximum sensitivity. The characteristic for RCADir is equal to 0° is shown
in Figure 83.
IEC06000648 V4 EN-US
Figure 83: Characteristic for RCADir equal to 0°
The characteristic is for
IEC06000649 V3 EN-US
Figure 84: 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
166
RCADir
3I
0
j =
ang(3I ) ang(3U
0
×
3I cos
0
RCADir equal to -90° is shown in Figure 84.
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 85.
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o o
= =
0 , ROADir 90
-
)
ref
- =
3U U
0 ref
j
IEC06000648-4-en.vsd
 
90 , ROADir = 90
− ang U ( )
ref
− 3U
0
1MRK 511 401-UEN Rev. K
Bay control REC670
Application manual