ABB REX640 User Manual

Bus riser compartment
Bus A compartment
Bus B compartment
Circuit breaker compartment
Cable end compartment
Incoming Feader Incoming FeaderOutgoing Feader Bus coupler Outgoing Feader
3I
3I 3I 3I
3I
3I
REX640
Base Functionality
ANSI IEC
AFD ARC4x
Inst.
3I
Loop sensor
Loop sensor
Loop sensor
REX640
Base Functionality
ANSI IEC
AFD ARC4x
Inst.
REX640
Base Functionality
ANSI IEC
AFD ARC4x
Inst.
REX640
Base Functionality
ANSI IEC
AFD ARC4x
Inst.
REX640
Base Functionality
ANSI IEC
AFD ARC4x
Inst.
GUID-FCEB1FAB-ED80-4086-AABF-FA58F644F0A3 V1 EN
Figure 12. Arc flash protection application
F
igure 12 presents an installation-wide arc flash protection
scheme for a double busbar switchgear. REX640 protection
relays are equipped with arc flash sensor card. The card
supports a maximum of four pieces of either loop or lens
sensors or a combination thereof. By using suitable sensor
combinations for different bays, we can build up a selective arc
flash protection scheme for the complete switchgear. The
selective operation of the arc flash protection scheme limits the
power outage caused by the arc fault to the smallest possible
section of the switchgear. The arc flash protection operation is
not dependent on light detection only; it is also supervised by
arc fault current measurement. Since the arc flash protection
operation should be as fast as possible, the use of static power
outputs for tripping circuits is highly recommended. The
functional condition of the arc flash sensor is continuously
supervised and if a problem is detected, an alarm is triggered;
this applies to both loop and lens sensors.
1MRS759144 A
REX640
Product version: 1
ABB 15

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