Siemens 7SC80 Manual page 152

Functions
2.4 Dynamic Cold Load Pickup
functions enabled, the timers of all overcurrent relay elements are stopped and may then be restarted based
on their "normal" duration.
During power up of the protective relay with an open circuit breaker, the time delay CB Open Time is
started, and is processed using the "normal" settings. Therefore, when the circuit breaker is closed, the
"normal" settings are effective.
Figure 2-38 illustrates the timing sequence.
pickup feature.
[zeitablaeufe-der-dynamischen-parameterumschaltung-260602-kn, 1, en_US]
Figure 2-38
152
Timing charts of the dynamic cold load pickup function
Figure 2-39 shows the logic diagram of the dynamic cold load
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017