76
1MRS755225
Transformer Terminal
Technical Reference Manual, General
RET 54_
5.1.13.10. System structure
The system very often resembles the system in the figure below. The protection,
control or alarm functions are implemented by using RET 54_ transformer
terminals, SPACOM units or other SPA bus devices (devices connected to the
system via the SPA bus). Generator or motor transformers are protected and
controlled with RET 54_ transformer terminals. LON devices made by other
manufacturers or other ABB companies may be used for various DI, AI and DO
functions. MicroSCADA is used for remote control.
Fig. 5.1.13.10.-1Example of a LON-based substation automation syste
m
In the system described in the figure above, communication is usually arranged as
shown in the table below.
Table 5.1.13.10-1Communication arrangement example
Data type RET <-> MicroSCADA
RET and LSG
devices to each other
Control commands transparent SPA bus messages -
Events and alarms sliding window protocol -
State of breakers and isolators sliding window protocol network variables
Analog measurement values sliding window protocol -
Other DI, AI data sliding window protocol network variables
Other DO, AO data transparent SPA bus messages network variables
Parameter data transparent SPA bus messages -
SPA file transfer data transparent SPA bus messages -
C
E
F
I
0
C
E
F
I
0
O
I
SPAC 331 C
O
I
SPAC 331 C
lonsys_b
SPA bus modules connected
over LON/SPA-gateways
RE_ 54_ or RET 54_
terminals connected via
RER 103 fibre-optic
adapters
RER 111 LON
star-coupler
SPA bus
SPA bus
Fibre-optic
LON network
MicroSCADA
PCLTA card and
RER 107 inside PC
RER 111 LON
SFIBER connection
cards
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