Siemens SIPROTEC 7SJ61 Manual page 179

Controlling Overcurrent Protection Stages via Cold Load Pickup
The cold load pickup function is another possibility to control the protection behavior via the automatic reclosing
system (see also Section 2.3). This function contains the parameter 1702 Start Condition It determines
the starting conditions for the increased pickup values of current and time of the cold load pickup to apply for
overcurrent protection.
If address 1702 Start Condition = 79 ready, the overcurrent protection always employs the increased
setting values if the automatic reclosing system is ready. The auto-reclosure function provides the signal 79
ready for controlling the cold load pickup. The signal 79 ready is always active if the auto-reclosing system
is available, active, unblocked and ready for another cycle. Control via the cold load pickup function is not AR-
cycle-related.
Since control via cold load pickup and cyclic control via auto-reclosing system can run simultaneously, the over-
current protection must coordinate the input values of the two interfaces. In this context the cyclic auto-reclosing
control has the priority and thus overwrites the release of the cold load pickup function.
If the protective elements are controlled via the automatic reclosing function, changing the control variables
(e.g. by blocking) has no effect on elements that are already running. The elements in question are continued.
Note Regarding Settings List for Automatic Reclosing Function
The setting options of address 7137 Cmd.via control are generated dynamically according to the current
configuration.
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
Functions
2.11 Automatic Reclosing System 79
179