REA 10_ Brochure - ABB Oy Distribution Automation - #2

Technical Data

REA Arc Protection System

Functions and features

• Extremely short overall operating time (<2.5 ms)

• Fast, adjustable three-phase overcurrent

or two-phase overcurrent and neutral current condition to secure tripping

• Long-sensor fiber or light collecting lenstype sensors

• Current measurement with inbuilt CTs

• Circuit-breaker failure protection

• Continuous self-supervision of sensor fiber loops,operating voltages and cabling between central units and extension units

• Wide area automatic or manual backlight compensation

• Power consumption 9...12 W

Peace of mind guaranteed The REA Arc Protection System is second to none when it comesto reliability: con­tinuous self-monitoring of the system, and its fiber-optic loops ensure non-stop pro­tection. Flexible overcurrent monitoring allows both light or light and overcurrent operation to trigger a circuit-breaker for absolute security. Furthermore, the system can be installed in either retrofit installations or greenfield investments. Selective indi­cation and zone-divided protection are easy to implement. Extension units allow single feeders or bus bars to be isolated, maintaining the power supply even in the event of an arc incident. Combined with zone-divided protection, this allows you to pinpoint exactly where the arc occurred. What's more, if one feeder is isolated during maintenance, the rest of the system re­mains fully protected against arcs.

The intelligent investment that minimizes material damage Whether caused by human error, a faulty device or bad insulators, arc faults expose your switchgear and other costly equip­ment to severe pressure and heat, not to mention the dangerto human life. Simply put, the REA Arc Protection System is the far-sighted way to improve productivity and increase profits while enhancing safety. It is a secure investment in your future competitiveness in more ways than one and will pay for itself many times over.

The REA101 Central unit:

• Two high-speed solid-state (Insulated Gate Bipolar Transistor) outputs for tripping CBs

• Selective tripping by additional extension units

• Two opto-connectors for fast signal transfer of light/current/trip signals between central units

• Relay output for circuit-breaker failure protection or as an alarm output

• Two RJ-45-type ports for chaining max. 5 extension units per port

Extension units for detecting the arc:

REA 103

• Two sensor fibers in loop or radial arrangement

• Two signal relays activated by light

REA105

• Loop-type or radial sensor fiber

• Two high-speed semi-conductor outputs for tripping CBs

• Signal relay activated by light

• Can serve as link between two REA101 relays

REA107

• Eight lens sensors in radial arrangement

• Two signal relays activated by light

Trip

REA 101

Light

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ABB Oy

Distribution Automation

P.O. Box 699

FI-65101 VAASA, Finland

Phone: +358 10 22 11

Fax: +358 10 22 41094

www.abb.com/substationautomation