ABB REC 523 Technical Reference Manual page 16

REC 523
16
Remote Monitoring and Control Unit
Technical Reference Manual
The REC 523 unit measures, for example, phase currents, neutral currents, phase-to-
phase or phase-to-earth voltages and residual voltages. The power factor, active and
reactive power are calculated from measured currents and voltages. Energy can be
calculated on the basis of the measured power. The measured values can be
indicated remotely as scaled primary values.
In addition to measurement and control functions, the REC 523 units are provided
with a large amount of programmable logic controller (PLC) functions allowing all
the functions needed for secondary substation automation to be integrated into one
unit. The data communication properties include communication over:
• SPA bus
• LON bus
• Modbus (RTU and ASCII)
• IEC 60870-5-101
• DNP 3.0 with higher-level equipment.
The flexibility of REC 523 makes it possible to use a wide range of communication
methods such as switched line telephone, leased line, optical cable, digital and
analogue mobile networks, radio modems, packet radio networks, radio links and
TETRA network.
MV
aux
+24V
Enclosure UEMC A2
Fig. 4.1.-2 Application example of the REC 523 unit
+12V
REC 523
RS232
1
2
9 Open
1
Close
2
1
2
9
15
IRF
Heating
1MRS750881-MUM
Radio
O
C
Remote
on
off
523SEC_b
M