ABB REA 101 Arc Protection System

Introduction

• The REA 101_ arc protection system is designed to provide fast trip commands to all circuit breakers (CB) that may feed an arc fault in low voltage or medium voltage air-insulated metal-clad switchgears.

• In case of an arc, the fault location can be quickly identified by checking the cover area of the sensor that detected the arc.

• Two sensor types are available:

• Patented long fiber sensor that detects light along its entire length.

• Light-collecting lens-type sensors, typically distributed one per compartment.

Features

• Fast, adjustable three-phase, or two-phase and neutral overcurrent condition to ensure tripping.

• Wide area automatic or manual backlight compensation.

• Loop-type or radial sensor fiber, or lens-type sensors for arc detection.

• Two high-speed solid-state (insulated gate bipolar transistor) outputs for tripping circuit breakers.

• One heavy-duty relay output for circuit breaker failure protection (CBFP) of an upstream breaker or as an alarm output.

• Two RJ-45 type ports for connecting extension units.

• Two opto-connectors for signal transfer between central units.

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

Use of the REA 101 Relay

• The central unit REA 101 can operate:

• Independently.

• With other REA 101 central units.

• With REA 103, REA 105, and REA 107 extension units.

• REA 101 is equipped with two extension ports.

• A maximum of five extension units can be daisy-chained to each port.

• Multiple REA 101 units can be interconnected via optolinks or through REA 105 units.

• Using REA 103, REA 105, and REA 107 provides selectivity and extends the protection area further.

• REA 105 is equipped with fast trip outputs capable of opening a bus coupler.

• REA 107 includes inputs for eight lens-type sensors.