ABB RELION 650 Series Applications Manual page 123

1MRK 504 158-UEN A
IEC06000649 V3 EN-US
Figure 57: Characteristic for RCADir equal to -90°
When OpMode is set to 3U03I0cosfi the apparent residual power component in the direction is
measured.
When OpMode is set to 3I0 and fi the function will operate if the residual current is larger than
the setting
The characteristic for this
IEC06000652 V3 EN-US
Figure 58: Characteristic for RCADir = 0° and ROADir = 80°
DirMode is set Forward or Reverse to set the direction of the operation for the directional
function selected by the
All the directional protection modes have a residual current release level setting
is set in % of
current to be detected.
Application manual
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 58.
RCADir = 0º
ROADir = 80º
OpMode .
IBase . This setting should be chosen smaller than or equal to the lowest fault
 
90 , ROADir = 90
− ang U ( )
ref
− 3U
0
Operate area
3I
0
-3U
0
IEC06000652-3-en.vsd
Section 7
Current protection
INRel> which
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