IED IEDIED
Substation LAN
IEC05000715-4-en.vsd
Remote
monitoring
Utility LAN
WAN
IEC05000715 V4 EN
Figure 336: 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.
20.5.2 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.
The SPA communication setting parameters are set on the local HMI under Main
menu/Configuration/Communication/Station communication/SPA/SPA:1.
1MRK 502 071-UEN - Section 20
Station communication
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 701
Application manual
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