Siemens 6MD85, Manual

Page: 211 / 1256

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 (only for 6MD86 application templates). 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.
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.
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?
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 (does not apply to circuit breaker [control] and circuit breaker [only status]).
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
6.4 Synchronization Function .
The Automatic reclosing function provides the auxiliary functions Dead-line check and Reduced dead time.
For these auxiliary functions, the 3-phase voltage system has to be measured. If you want to use these auxil-
iary functions, the measuring point of the 3-phase voltage system must be connected to the Voltage function
5.5.3
Function-Group Types
5.5 Function-Group Type Circuit Breaker, 3-Pole
SIPROTEC 5, High-Voltage Bay Controller, Manual 211
C53000-G5040-C015-9, Edition 11.2017