1. IdMin
2. EndSection1
3. EndSection2
4. SlopeSection2
5. SlopeSection3
Section 1
Operate
conditionally
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
[ times IBase ]
operate current
[ times IBase ]
SlopeSection2
SlopeSection3
en05000187-2.vsd
IEC05000187 V2 EN
Figure 33: Description of the restrained, and the unrestrained operate
characteristics
where:
100%
Ioperate
slope
Irestrain
D
=
D
×
EQUATION1246 V1 EN
The operate - restrain characteristic is tailor-made and can be designed freely by the
user after his needs. The default characteristic is recommended to be used. It gives
good results in a majority of applications. The operate - restrain characteristic has in
principle three sections with a section-wise proportionality of the operate value to the
bias (restrain) current. The reset ratio is in all parts of the characteristic equal to 0.95.
Section 6 1MRK502052-UEN B
Differential protection
124
Technical manual
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