Detection Manual Closure (For Arec And Process Monitor); Function Description - Siemens 7SJ82 Manual

This information is needed in the following protection-related additional functions:
•
Trip logic (see
•
Detection of manual closing (see
•
Process monitor (Standard V/I)
Its use is described in the respective chapters.
The control does not use this information. The control evaluates the circuit-breaker auxiliary contacts.
[lozust3p-070611-01.tif, 1, en_US]
Figure 5-86
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
Open
Closed
Possibly open, possibly
closed
Opening

Detection Manual Closure (for AREC and Process Monitor)

5.7.9
5.7.9.1

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.
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
5.7.6.1 Function Description)
5.7.9.1 Function
5.8 Process
Overview of the Circuit-Breaker Condition Position Function
Description
The circuit-breaker pole is detected unambiguously as open according to both
criteria.
The circuit-breaker pole is detected unambiguously as closed according to both
criteria.
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.
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.
Description)
Monitor)
Function-Group Types
5.7 Function-Group Type Circuit Breaker
291