IED IEDIED
Substation LAN
ANSI05000715-4-en.vsd
Remote
monitoring
Utility LAN
WAN
ANSI05000715 V4 EN
Figure 409: SPA communication structure for a remote monitoring system via a
substation LAN, WAN and utility LAN
SPA communication is mainly used for the Station Monitoring System. It can include
different IEDs with remote communication possibilities. Connection to a PC can be made
directly (if the PC is located in the substation), via a telephone modem through a telephone
network with ITU (former CCITT) characteristics or via a LAN/WAN connection.
glass
<1000 m according to optical budget
plastic <25 m (inside cubicle) according to optical budget
Functionality
The SPA protocol V2.5 is an ASCII-based protocol for serial communication. The
communication is based on a master-slave principle, where the IED is a slave and the PC
is the master. Only one master can be applied on each fibre optic loop. A program is
required in the master computer for interpretation of the SPA-bus codes and for translation
of the data that should be sent to the IED.
For the specification of the SPA protocol V2.5, refer to SPA-bus Communication Protocol
V2.5.
21.4.2 Setting guidelines
SPA, IEC 60870-5-103 and DNP3 use the same rear communication port. This port can
be set for SPA use on the local HMI under Main menu /Configuration /
Communication /Station communication/Port configuration/SLM optical serial
port/PROTOCOL:1. When the communication protocol is selected, the IED is
automatically restarted, and the port then operates as a SPA port.
1MRK 506 369-UUS - Section 21
Station communication
Line distance protection REL670 2.2 ANSI 871
Application manual
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