Siemens 6MD85, Manual

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General Functionality
Description
Logic
As the wear on the circuit breaker depends on the current amplitude and duration of the actual switching
action, including arc deletion, determination of the start and end criteria is important. The following general
functionality provides starting and further timing information to the different stages (methods).
The general functionality operates phase-selectively. The following figure shows the logic of the functionality
across stages.
[LoCBWear, 3, en_US]
Figure 9-22 Logic Diagram of the Functionality Across Stages of the Circuit-Breaker Wear Monitoring Func-
tion
Start Criterion for the Circuit-Breaker Wear Monitoring Function
The Circuit-breaker wear monitoring function starts when any of the following criteria is fulfilled:
•
Internal protection-function tripping signal from the function block Trip logic is received
•
Open command signal from the internal Control function is received.
•
Binary input signal
>Start calculation
is initiated, for example, from external.
9.6.3
9.6.3.1
Measured Values, Energy Values, and Supervision of the Primary System
9.6 Circuit-Breaker Wear Monitoring
SIPROTEC 5, High-Voltage Bay Controller, Manual 1021
C53000-G5040-C015-9, Edition 11.2017