2.8 Unbalanced Load Protection
207
7UT613/63x Manual
C53000-G1176-C160-2
Figure 2-92
Tripping characteristic of the definite time unbalanced load protection
Inverse Time Stage
The inverse time overcurrent stage operates with a tripping characteristic either ac-
cording to the IEC or the ANSI standard. The characteristics and their equations are
given in the „Technical Data“. The definite time elements
I
2>> and
I
2> are superim-
posed on the inverse time curve.
Pickup, Trip
The negative sequence current
I
2
is compared to the set value
I2p
. When the nega-
tive sequence current exceeds 1.1 times the setting value, a pickup annunciation is
generated. The tripping time is calculated from the negative sequence current accord-
ing to the characteristic selected. After expiration of the time period a tripping
command is output. Figure 2-93 shows the qualitative course of the characteristic; the
overlapping
I
2>> stage is represented by a dashed line.
Summary of Contents for SIPROTEC 7UT613 series
Page 16: ...Contents 16 7UT613 63x Manual C53000 G1176 C160 2 Literature 631 Glossary 623 Index 633 ...
Page 30: ...1 Introduction 30 7UT613 63x Manual C53000 G1176 C160 2 ...
Page 506: ...A Appendix 506 7UT613 63x Manual C53000 G1176 C160 2 7UT633 D E ...
Page 508: ...A Appendix 508 7UT613 63x Manual C53000 G1176 C160 2 7UT633 P Q ...
Page 510: ...A Appendix 510 7UT613 63x Manual C53000 G1176 C160 2 7UT635 D E ...
Page 512: ...A Appendix 512 7UT613 63x Manual C53000 G1176 C160 2 7UT635 P Q ...
Page 515: ...A 2 Terminal Assignments 515 7UT613 63x Manual C53000 G1176 C160 2 7UT633 B ...
Page 517: ...A 2 Terminal Assignments 517 7UT613 63x Manual C53000 G1176 C160 2 7UT633 N ...
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Page 632: ...Literature 632 7UT613 63x Manual C53000 G1176 C160 2 ...