Siemens siprotec 7SA6 User Manual page 22

Introduction
Messages and
Measured Values;
Storage of Data for
Fault Recordings
Communication
1-6
For the rapid location of the damage to the line after a short-circuit, a fault locator is
integrated which also may compensate for the influence of a parallel line and load.
A series of operating messages provides information about conditions in the power
system and the 7SA6 itself. Measurement quantities and values that are calculated
can be displayed locally and communicated via the serial interfaces.
Messages of the 7SA6 can be indicated by a number of programmable LEDs on the
front panel, externally processed through programmable output contacts, and
communicated via the serial interfaces (see "Communication" below). With the help of
the CFC graphic tool (Continous Function Chart) user-defined annunciations and
logical combinations of internal or external signals can also be generated.
Important events and changes in conditions are saved under Annunciation in the
Event Log or the Trip Log, the latter being used for faults. The instantaneous
measured values during the fault are also stored in the device and are subsequently
available for fault analysis.
Serial interfaces are available for communications with PCs, RTUs and SCADA
systems.
A 9-pin D-subminiature female connector on the front cover is used for local
communication with a personal computer. DIGSI
communicate via this port. Using the SIPROTEC
operating and evalution procedures may be implemented via this operating interface,
such as setting and modification of configuration and parameter settings, configuration
of user-specific logic functions, reading out and display of operating and fault event
messages as well as measured values, reading out and display of fault records,
queries of device states as well as queries of measured values, and issuing of control
commands.
Depending on the version ordered, further interfaces are on the rear side of the device.
Thus a comprehensive communication can be built up with other digital operating
control and storage systems:
The service interface can be operated via data or fibre optic cables. Communication
via modems is also possible. This enables remote operation from a PC using the
®
DIGSI 4 operating software, e.g. if several devices are to be operated from a central
PC.
The system interface is used for central communication between the device and the
control centre. It can also be operated via data and fibre optic cables. Standardized
protocols for data transfer in accordance with IEC 60870-5-103 are available. This
profile also enables the integration of devices into the SINAUT
automation systems.
As an alternative SIPROTEC
FMS. The PROFIBUS FMS according to DIN 19245 with a very high capacity is a
widespread communication standard in the control and automation technology. The
profile of the PROFIBUS communication covers all types of information transmission
needed for substation control and protection systems. Via this profile the devices are
connected to the energy automation system SICAM
®
4 software is required to
®
DIGSI
®
4 also provides a field bus interface with PROFIBUS
®
®
4 operator software, all
®
LSA and SICAM
.
7SA6 Manual
C53000-G1176-C133-1
®