The REA system is a fast and flexible arc fault protection system for air-insulated low voltage and medium voltage switchgears. A fast and selective arc fault protection system is a natural constituent of a modern switchgear panel and a safety and security investment for older switchgears to protect human lives and prevent or reduce asset damage.

The REA arc fault protection system uses two types of sensors for detecting light: a non-shielded, bare-fiber sensor that detects light along its entire length and light collecting lens-type sensors with typically one sensor installed per switchgear compartment.

The function of the REA arc fault protection system is based on detecting the intense light of an electric arc alone or on a detection of light and simultaneous phase or neutral overcurrent. On detection of an arc fault, the REA arc fault protection system delivers trip commands in less than 2.5 ms to all circuit breakers that feed the fault zone. Furthermore, the operation indicators of the REA arc fault protection system help localizing faults by selectively guiding the maintenance staff to the fault zone, that was identified by the arc fault protection system.

The actual REA arc fault protection system consists of one or more arc fault protection main modules type REA 101 and a necessary number of extension modules type REA 103, REA 105 and REA 107. The main module REA 101 can operate as a stand-alone device or cooperate with other REA 101 modules, and with the REA 103, REA 105 or REA 107 extension modules. The extension modules REA 103 and REA 107 allow the number of sensor fibers and/or lens-type sensors to be increased to extend the area of protection. The use of the extension module REA 105 including fast trip outputs will allow protection schemes with increased selectivity to be created.

ABB 3BHB004661R0101 KUC711AE101
ABB CRBX01 2VAA008424R1
ABB LDSTA-01 63940143B
ABB LDMTR-01 63940135F
ABB 57619414 A 2/2
ABB 57619414 A 1/2
ABB MR627 P89627-0-2333400-300-401-601-701
ABB FPX86-9377–A
ABB LWN2660-6E
ABB LWN2660-6EG
ABB NDBU-95C 64008366D
ABB M3V4-1/0-0 64122088
ABB Z-NTS
ABB FAZ-XHIN11
ABB FAZ-C2/2-DC
ABB FAZ-C2/1
ABB FAZ-C10/1
ABB FAZ-C6/1