[lozust3p-070611-01.tif, 1, en_US]
Figure 5-29 Overview of the Circuit-Breaker Condition Position Function
Based on the link between the information from the auxiliary contacts and the current flow, the circuit breaker
can assume the following positions:
Circuit-Breaker Condi-
tion
Description
Open The circuit-breaker pole is detected unambiguously as open according to both
criteria.
Closed The circuit-breaker pole is detected unambiguously as closed according to both
criteria.
Possibly open, possibly
closed
These conditions can occur if the information is incomplete due to the routing of
the auxiliary contacts and the condition can no longer be determined reliably.
These uncertain conditions are evaluated differently by certain functions.
Opening This is a dynamically occurring condition that results when, while a trip command
is active and the auxiliary contact is still closed, the current is detected to have
fallen below the threshold value because the current-flow criterion takes effect
faster than the auxiliary contact can open.
Detection Manual Closure (for AREC and Process Monitor)
Function Description
Detection of Manual Closure (for Process Monitor)
The Manual closure function block detects any closure carried out by hand. This information is used in the
Process monitor functions (within protection function groups).
The following figure shows the logic for manual closure detection.
5.5.9
5.5.9.1
Function-Group Types
5.5 Function-Group Type Circuit Breaker, 3-Pole
224 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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