Siemens 7SJ85 - Detection Manual Closure (for AREC and Process Monitor); Function Description

This information is needed in the following protection-related additional functions:
•
Trip logic (see 5.7.6.1 Function Description)
•
Detection of manual closing (see 5.7.9.1 Function Description)
•
Process monitor (Standard V/I) 5.8 Process Monitor)
Its use is described in the respective chapters.
The control does not use this information. The control evaluates the circuit-breaker auxiliary contacts.
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Figure 5-86 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 AREC and Process Monitor)
The Manual closure function block detects any closure carried out by hand. This information is used in func-
tion, the automatic reclosing (AREC) and Process monitor functions (within protection function groups).
You can find detailed information in the chapters Automatic reclosing function and Process monitor.
The following figure shows the logic for manual closure detection.
5.7.9
5.7.9.1
Function-Group Types
5.7 Function-Group Type Circuit Breaker
SIPROTEC 5, Overcurrent Protection, Manual 291
C53000-G5040-C017-8, Edition 07.2017