Use the general Circuit breaker function group only in the following cases:
•
Interaction with a protection-function group is essential.
That is, operate indications of protection functions cause the circuit breaker assigned to the Circuit
breaker function group to be switched off.
•
You want to use functions such as the automatic reclosing function or circuit-breaker failure protection in
the Circuit breaker function group.
If a circuit breaker is only to be modeled for control purposes, use the Circuit breaker [state only] function
group.
Function Points
When you order a SIPROTEC 5 device, you are also ordering a function-points account for use of additional
functions.
The following figure illustrates consumption of function points in the current application with respect to the
existing function-points account.
[scfpunkt-141210-01, 1, en_US]
Figure 8-2 Resource Overview: Function-Points Consumption
The remaining white bar shows the function points that have not yet been used up by your configuration. The
number of function points available in a device depends on the device purchase order (position 20 of the
product code). You can also order function points subsequently, and so increase the function-points account
for the device.
NOTE
Find out the function-points requirement for the desired application before ordering the device. For this,
you can use the device configurator.
CFC Resources
Task Levels of the CFC Function
A CFC chart, and thus the configured CFC function, runs in the SIPROTEC 5 device on exactly one of the 4 task
levels. The individual task levels differ, on the one hand, in the priority of processing tasks and, on the other,
in the cyclic or event-triggered processing of the CFC charts.
You can select between the following task levels:
Task Level
Description
Fast Event-Triggered
Use the Fast Event-Triggered task level for time-critical tasks, for
example, if a signal should block a protection function within 2 ms to 3 ms.
Functions on this task level are processed in an event-triggered way with
the highest priority. Each change to a logical input signal is immediately
processed. Processing can interrupt the execution of protection functions
and functions on the Event-Triggered task level.
8.2.2
8.2.3
Supervision Functions
8.2 Resource-Consumption Supervision
SIPROTEC 5, High-Voltage Bay Controller, Manual 935
C53000-G5040-C015-9, Edition 11.2017
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