Technical data

Siemens SIP · 2008
12 Motor Protection / 7SK80
12
12/19
DNP 3.0 protocol
Power utilities use the serial DNP 3.0 (Dis
-
tributed Network Protocol) for the station
and network control levels. SIPROTEC
units function as DNP slaves, supplying
their information to a master system or
receiving information from it.
System solutions for protection and station
control
Units featuring IEC 60870-5-103 interfaces
can be connected to SICAM in parallel via
the RS485 bus or radially by fiber-optic
link. Through this interface, the system is
open for the connection to other manufac
-
turers systems (see Fig. 12/13).
Because of the standardized interfaces,
SIPROTEC units can also be integrated
into systems of other manufacturers or in
SIMATIC. Electrical RS485 or optical in
-
terfaces are available. The best physical
data transfer medium can be chosen thanks
to opto-electrical converters. Thus, the
RS485 bus allows low-cost wiring in the
cubicles and an interference-free optical
connection to the master can be estab-
lished.
For IEC 61850, an interoperable system so-
lution is offered with SICAM. Through the
100 Mbits/s Ethernet bus, the units are
linked with SICAM electrically or optically
to the station PC. The interface is stan
-
dardized, thus also enabling direct connec
-
tion to relays of other manufacturers and
into the Ethernet bus. With IEC 61850,
however, the relays can also be used in
other manufacturers’ systems (see Fig. 12/14).
Communication
Fig. 12/16
System solution/communication
Fig. 12/17
Connection of two RTD units to 7SK80 using Ethernet