Technical data

Siemens SIP · 2008
12 Motor Protection / 7SK80
12
12/18
The relay offers flexibility with reference to
its communication to substation automa-
tion systems and industrial SCADA or
DCS systems. The communication module
firmware can be changed to communicate
using another protocol or the modules can
be changed completely for a different con
-
nection or protocol. It will thus be possible
to move to future communication proto
-
cols like popular Ethernet based protocols
with ease.
USB interface
There is an USB interface on the front of
the relay. All the relay functions can be
set using a PC and DIGSI 4 protection
operation program. Commissioning tools
and fault analysis are built into the DIGSI
program and are used through this inter
-
face.
Interfaces
A number of communication modules
suitable for various applications can be
fitted at the bottom of the housing. The
modules can be easily replaced by the user.
The interface modules support the follow-
ing applications:
• System/service interface
Communication with a central control
system takes place through this interface.
Radial or ring type station bus topologies
can be configured depending on the cho
-
sen interface. Furthermore, the units can
exchange data through this interface via
Ethernet and the IEC 61850 protocol and
can also be accessed using DIGSI.
Alternatively up to two external tempera
-
ture monitoring boxes with a total of 12
measuring sensors can be connected to
the system/service interface.
•
Ethernet interface
The Ethernet interface was implemented
for fast access to a number of protection
units using DIGSI. It is also possible to
connect up to two external temperature
monitoring boxes (RTD-box for
Ethernet) with a total of 12 measuring
sensors to the Ethernet interface.
Communication
Fig. 12/13
IEC 60870-5-103: Radial fiber-optic connection
System interface protocols (retrofittable)
IEC 61850 protocol
Since 2004, the Ethernet-based IEC 61850
protocol is a global standard for protection
and control systems used by power utili-
ties. Siemens was the first manufacturer to
implement this standard. This protocol
makes peer-to-peer communication possi
-
ble. It is thus possible to set up masterless
systems to perform interlocking or transfer
schemes. Configuration is done using
DIGSI.
IEC 60870-5-103 protocol
The IEC 60870-5-103 protocol is an inter
-
national standard for the transmission of
protective data and fault recordings. All
messages from the unit and also control
commands can be transferred by means of
published, Siemens-specific extensions to
the protocol. As a further option a redun
-
dant IEC 60870-5-103 module is available
as well. With the redundant module it will
be possible to read and change single
parameters.
PROFIBUS-DP protocol
PROFIBUS-DP is a widespread protocol
in industrial automation. Through
PROFIBUS-DP, SIPROTEC units make
their information available to a SIMATIC
controller or receive commands from a
central SIMATIC controller or PLC.
Measured values can also be transferred
to a PLC master.
MODBUS RTU protocol
This simple, serial protocol is mainly
used in industry and by power utilities, and
is supported by a number of relay manu
-
facturers. SIPROTEC units function as
MODBUS slaves, making their informa
-
tion available to a master or receiving in
-
formation from it. A time-stamped event
list is available.
Fig. 12/14
Bus structure for station bus with Ethernet and
IEC 61850, fiber-optic ring
Fig. 12/15
Optical Ethernet communication module
for IEC 61850 with integrated Ethernet-switch
LSP2810.tif