When communicating with a PC connected to the utility substation LAN via WAN and
the utility office LAN (see Figure 422), and when using the rear optical Ethernet port,
the only hardware required for a station monitoring system is:
• Optical fibres from the IED to the utility substation LAN
•
PC connected to the utility office LAN
IED IEDIED
Substation LAN
ANSI05000715-4-en.vsd
Remote
monitoring
Utility LAN
WAN
ANSI05000715 V4 EN-US
Figure 422: 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 v2
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.
1MRK 504 163-UUS A Section 21
Station communication
Transformer protection RET670 2.2 ANSI 939
Application manual
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