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ABB Relion 670 series - Page 135

ABB Relion 670 series
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Section 1
UnrestrainedLimit
Section 2
Section 3
Restrain
Operate
unconditionally
5
4
3
2
1
0
0 1 2 3 4 5
IdMin
EndSection1
EndSection2
Restrain current
[ in pu of IBase]
Operate current
[ in pu of IBase]
SlopeSection2
SlopeSection3
en05000300.vsd
Operate
conditionally
IdMinHigh
A
C
B
IEC05000300 V1 EN
Figure 52: Description of the restrained-, and the unrestrained operate
characteristics
where:
100%
Ioperate
slope
Irestrain
D
=
D
×
EQUATION1246 V1 EN
and where the restrained characteristic is defined by
the settings:
1. IdMin
2. EndSection1
3. EndSection2
4.
SlopeSection2
5. SlopeSection3
1MRK505222-UUS C Section 5
Differential protection
129
Technical reference manual

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