ABB REX640 User Manual

optically connected to the relays using short optical single-
mode cables. Using 0.8 mm
2
twisted pair cables, pilot wire link
distances up to 8 km are typically supported. However, twisted
pair pilot wire cables in good conditions may support even
longer distances to be covered. The length of the supported
pilot wire link also depends on the noise environment in the
installation. Should the need arise to replace the pilot wire
cables with fiber optic cables, the single-mode fiber optic LC
connectors of the relays can be used for direct connection of
the fiber optic communication link.
The protection communication supervision continuously
monitors the protection communication link. The line differential
protection function can be blocked if severe interference in the
communication link, risking the correct operation of the
function, is detected. If the interference persists, an alarm
signal is triggered indicating permanent failure in the protection
communication.
Protection communication and supervision
Binary signal transfer
Fiber-optic line differential communication link
GUID-5735D9CC-B1D2-4D73-85C2-1389ED25563B V1 EN
Figure 20. Fiber-optic communication link
Pilot wire line differential
communication link
Protection communication and supervision
Binary signal transfer
RPW600
modem
RPW600
modem
Pilot wire line differential
communication link
Protection communication and supervision
Binary signal transfer
RPW600
modem
RPW600
modem
GUID-9A404E8B-1120-42B4-B72E-8EEFC15E4960 V1 EN
Figure 21. Pilot wire protection communication link
1MRS759144 A
REX640
Product version: 1
ABB 27

ABB REX640 Specifications

General

Device Type	Protection Relay
Communication Protocols	IEC 61850, Modbus, DNP3, IEC 60870-5-103
Rated Frequency	50/60 Hz
Operating Temperature Range	-25°C to +55°C
Display	LCD
Housing	Metal
Manufacturer	ABB
Model	REX640
Mounting	Rack mounting
Inputs and Outputs	Configurable binary inputs and outputs
Rated Voltage	48-240 V AC/DC
Protection Functions	Overcurrent, Earth Fault
Input Voltage	48-240 V AC/DC
Certifications	CE, UL, IEC