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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
Summary of Contents for Relion REG670
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