Technical data

1MRS751108-MUM
REX 521
39
Protection Relay
Technical Reference Manual, General
5.1.12.6. LON
The protection relay is able to interface to the substation automation system with the
LON communication protocol. The LON communication between REX 521 and the
host device, for example MicroSCADA, is based on LAG (Lon Application
Guideline) version 1.4. The REX 521 LON communication includes vertical
communication of process data and parameter data between the protection relay and
the host device.
The system very often resembles the system in Fig. 5.1.12.6.-1. The protection,
control or alarm functions are implemented by using REX 521 protection relays and
other RED 500 series protection relays, SPACOM units or other SPA bus devices
(devices connected to the system via the SPA bus). 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.
A051911
Fig. 5.1.12.6.-1 Example of a LON-based substation automation system
In the system described in Fig. 5.1.12.6.-1, communication is usually arranged as
shown in the table below.
Data type
REX
↔ MicroSCADA
Events and alarms sliding window protocol
Control commands sliding window protocol
transparent SPA bus messages
Status of breakers and isolators sliding window protocol
Analog measurement values sliding window protocol
Other DI, AI data sliding window protocol
Other DO data transparent SPA bus messages
Parameter data transparent SPA bus messages
Disturbance recorder data file transfer over the LON network
RER 103
MicroSCADA
REX 521
READY START TRIP
FEEDER PROTECTION
REX 521
READY START TRIP
FEEDER PROTECTION
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
DI, AI and DO modules
LonMark devices
SPA bus module
connected
over LON/SPA-
gateways
REX 521 protection relays
Electrical LON
network
RER 111 LON
star-coupler
Router card in
RER 111 LON
star-coupler
LON/SPA
gateway
Fibre-optic
LON network
PCLTA card and
RER 107 inside PC
RER 111 LON
SFIBER connection
cards
REF 54_
feeder terminal