
Functions
2.5 Negative Sequence Protection 46
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
97
Figure 2-29
Logic diagram of the unbalanced load protection
The pickup of the definite time overcurrent protection can be stabilized by the configured dropout time
4012
46 T DROP-OUT
. This time is started and maintains the pickup condition if the current falls below the threshold.
Therefore, the function does not drop out at high speed. The trip command delay time continues running. After
the dropout delay time has elapsed, the pickup is reported OFF and the trip delay time is reset unless the
threshold has been exceeded again. If the threshold is exceeded again during the dropout delay time, the time
is cancelled. The trip command delay time continues running. Should the threshold value be exceeded after its
expiry, the trip command is issued immediately. If the threshold value is not exceeded at this time, there will be
no reaction. If the threshold value is exceeded again after expiry of the trip-command delay time, while the
dropout delay time is still running, tripping occurs immediately.
The configured dropout times do not influence the tripping times of the inverse time elements as these depend
dynamically on the measured current value. For purposes of dropout coordination, disc emulation is used with
electro-mechanical relays.
Содержание SIPROTEC 7SJ61
Страница 368: ...Technical Data 4 22 Dimensions SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 368 ...
Страница 436: ...Appendix A 11 Measured Values SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 436 ...
Страница 438: ...Literature SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 438 ...
Страница 450: ...Glossary SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 450 ...
Страница 454: ...Index SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 454 ...