Dynamic Cold Load Pickup Function; Inrush Restraint; Pickup Logic And Tripping Logic - Siemens 7SC80 Manual

[7sc80-log-service-140114, 1, en_US]
Figure 2-18

Dynamic Cold Load Pickup Function

2.2.8
It may be necessary to dynamically increase the pickup thresholds of the overcurrent protection if certain
system components exhibit an increased power consumption when they are switched on after a long period
of zero voltage (e.g. air-conditioning systems, heating installations, motors). Thus, a general increase of
pickup thresholds can be avoided taking into consideration such starting conditions.
This dynamic pickup value changeover fuction is common to all overcurrent elements and is described in
Section 2.4 Dynamic Cold Load
of the time overcurrent protection.
2.2.9

Inrush Restraint

The 7SC80 Feeder Protection and Recloser Controller features an inrush current detection which you can acti-
vate separately for each element of the overcurrent protection. The function is described in Section
2.12.1 Measurement

Pickup Logic and Tripping Logic

2.2.10
The pickup annunciations of the individual phases (or ground) and the individual elements are combined with
each other in such a way that the phase information and the element that has picked up are issued.
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
Logic diagram of the overcurrent element 50-1 for phases in the case of active service inter-
locking
Pickup. The alternative pickup values can be set individually for each element
Supervision.
2.2 Overcurrent Protection 50, 51, 50N, 51N
Functions
85