1MRS750915-MUM
REM 54_
73
Machine Terminal
Technical Reference Manual, General
5.1.13.7.
System structure
The system very often resembles the system in the figure below. Generator or motor
feeders are protected and controlled with REM 54_ machine terminals. Some
protection, control or alarm functions are implemented by using REF 54_ feeder
terminals, SPACOM units or other SPA bus devices (devices connected to the
system via the SPA bus). MicroSCADA is used for remote control.
A050742
Fig. 5.1.13.7.-1 Example of a LON-based substation automation system
In the system described in the figure above, communication is usually arranged as
shown in the table below.
Data type
REM <-> MicroSCADA
REM and LSG
devices to each other
Events and alarms
sliding window protocol
-
Control commands
transparent SPA bus messages
-
Status 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
(e.g. the disturbance records)
transparent SPA bus messages
-
O
I
SPAC 331 C
REF 541
Uaux = 80...265 Vdc/ac
fn = 50 Hz
In = 1/5 A (I)
1MRS xxxxxx
98150
9509
Ion = 1/5 A (Io)
Un = 100/110 V (U)
Uon = 100/110 V (Uo)
21 kV
CB OK
AROFF
REF 541
Uaux = 80...265 Vdc/ac
fn = 50 Hz
In = 1/5 A (I)
1MRS xxxxxx
98150
9509
Ion = 1/5 A (Io)
Un = 100/110 V (U)
Uon = 100/110 V (Uo)
21 kV
CB OK
AROFF
O
I
SPAC 331 C
SPA bus modules connected
over LON/SPA-gateways
RE_ 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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