IED IEDIED
Substation LAN
IEC05000715-4-en.vsd
Remote
monitoring
Utility LAN
WAN
IEC05000715 V4 EN-US
Figure 418: 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
SEMOD115767-25 v3
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 fiber 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.
21.5.2 Setting guidelines
M11876-3 v7
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.
The SPA communication setting parameters are set on the local HMI under Main
menu/Configuration/Communication/Station communication/SPA/SPA:1.
1MRK 506 369-UEN B Section 21
Station communication
Line distance protection REL670 2.2 IEC 831
Application manual
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