If an application template is used, the function group is connected to the measuring point of the 3-phase
current because this connection is essential. It can be necessary to connect additional measuring points to the
function group, depending on the nature of the user functions used. Configuration is carried out using the
Function-group connections editor in DIGSI 5. You can find more detailed information on this in chapter
2.1 Function Embedding in the Device.
If a user function, for example, synchronization, is used in the function group but the required measuring
point has not linked to it, DIGSI 5 reports an inconsistency. This inconsistency provides an indication of the
missing measuring-point connection.
The Circuit-breaker function group has interfaces with the following measuring points:
•
3-phase line current
The measurands from the 3-phase power system are supplied via this interface. The function group must
always be connected to this measuring point.
•
Voltage
The measurands of the 3-phase voltage system or 1-phase voltage are supplied via this interface.
Depending on the connection type of the transformers, in the 3-phase voltage system these are, for
example, V
A
, V
B
, V
C
of the line or feeder.
The connection to the corresponding measuring point is necessary only if a user function that needs the
measurand of the 3-phase voltage system is used, for example, to make use of the Synchronization or
Automatic reclosing function.
•
Sync. Voltage1, Sync. Voltage2
A 1-phase synchronization voltage (for example, voltage of the busbar with a 1-phase connection) or a 3-
phase synchronization voltage (for example, voltage of the busbar with a 3-phase connection) is supplied
via this interface.
The connection to the corresponding measuring point is necessary only if synchronization is used.
Interface with Protection-Function Groups
All required data is exchanged between the protection function groups and the Circuit-breaker function
group via the interfaces of the Circuit-breaker function group. This data includes, for example, the pickup and
operate indications of the protection functions sent in the direction of the Circuit-breaker function group and,
for example, the circuit-breaker condition information in the direction of the protection function groups.
If an application template is used, the function groups are connected to each other because this connection is
essential to ensure proper operation. You can modify the connection using the Function-group connections
editor in DIGSI 5.
You can find more detailed information in chapter 2.1 Function Embedding in the Device.
If the connection is missing, DIGSI 5 reports an inconsistency.
Besides the general assignments of the protection function group or groups to the Circuit-breaker function
groups, you can also configure the interface for certain functionalities in detail:
•
Which operate indications of the protection functions are included when the trip command is generated?
•
Which protection functions activate the Automatic reclosing function?
•
Which protection functions activate the Circuit-breaker failure protection function?
You can find more detailed information in chapter 2.1 Function Embedding in the Device.
Application and Setting Notes
Interface with Measuring Points
The interface with the 3-phase power system must have been configured. Otherwise, DIGSI 5 supplies an
inconsistency message.
If the Synchronization function is used, the measuring points that represent voltages V1 and V2 of the parts
of the electrical power system to be synchronized must be connected.
You can find more detailed information in chapter 8.4 Synchronization Function.
5.7.3
Function-Group Types
5.7 Function-Group Type Circuit Breaker
278 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
To Next Page
Loading...
