Siemens 7SJ82 - Structure of the Function Group

For more information about the embedding of the functions in the device, refer to chapter 2 Basic Structure of
the Function. For application templates of the various device types, refer to chapter 4 Applications.
Structure of the Function Group
The Capacitor bank diff. function group, according to 5.5.2.1 Overview , has interfaces with the Capacitor
bank, the Capacitor bank side, and the Circuit-breaker function groups. The Capacitor bank diff. function
group contains the function blocks:
•
Protection function (execution of the differential protection function)
•
Trip logic (generation of forwarding of the operate indication)
In the Capacitor bank diff. function group, the differential protection function must always be available so
that the protection functionality can be ensured. If you do not use an application template, load the differen-
tial protection function from the Global DIGSI library.
[dwfgcadf-030314-01, 3, en_US]
Figure 5-26 Structure of the Capacitor Bank Diff. Function Group
The Capacitor bank diff. function group has interfaces to the following components:
•
Function group Capacitor bank
•
Function group Capacitor bank side
•
Circuit-breaker function group
Interfaces with the Circuit-Breaker Function Group
The interface with the Circuit-breaker function group is used to exchange all required data between the
protection function group and the Circuit-breaker function group. The following data is required:
•
Pickup and operate indications of the protection functions in the direction of the Circuit-breaker function
group
•
Information on the circuit-breaker condition in the direction of the Protection function groups
You can connect the Capacitor bank diff. function group to one or more Circuit-breaker function groups.
This connection determines the following:
•
Which circuit breakers are activated by the protection functions of the Capacitor bank diff. function
group
•
Start of the Circuit-breaker failure protection function, if available in the Circuit-breaker function
group, through the protection functions of the connected Capacitor bank diff. function group
Besides the general assignment of the Capacitor bank diff. function group to the Circuit-breaker function
group, you can also configure the interface for specific functionalities in detail. Configure the details in DIGSI 5
via the Circuit-breaker interaction Editor in the Capacitor bank side diff. function group.
For the detail configuration of the interface, define the following:
•
Which operate indications of the protection functions are included when the trip command is generated
•
Which protection functions activate the Circuit-breaker failure protection function
5.5.2.2
Function-Group Types
5.5 Function-Group Type Capacitor Bank Differential Protection
226 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017