Siemens siprotec SJ62 User Manual page 151

2 Functions
Figure 2-49 Logic diagram of the unbalanced load protection
149
Pickup of the definite time elements can be stabilized by setting the dropout time 4012
46 T DROP-OUT. This time is started if the current falls below the threshold and main-
tains the pickup condition. The function thus does not drop out instantaneously. The
trip delay time continues in the meantime. After the dropout delay time has elapsed,
the pickup is reported OFF and the trip delay time is reset unless the threshold has
been violated again. If the threshold is violated again while the dropout delay time is
still running, it will be cancelled. The trip delay time continues however. If the threshold
is still exceeded after the time has elapsed, a trip will be initiated immediately. If the
threshold violation then no longer exists, there will be no response. If the threshold is
violated again after the trip command delay time has elapsed and while the dropout
delay time is still running, a trip will be initiated at once.
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015