ABB SPAA 321C

• Comprehensive numerical feeder protection relay consisting of two multi-function protection relay modules and a flexible auto-reclose relay module • Overall scheme comprising time overcurrent protection, short-circuit protection, phase discontinuity protection, non-directional and directional earth-fault protection, general earth-fault supervision, auto-reclose facilities, circuit-breaker failure protection and circuit-breaker condition monitoring • 1 A and 5 A tappings on the energizing current inputs of the overcurrent and non-directional earth-fault protection and 0.2 A and 1 A tappings on the energizing inputs of the directional earth-fault protection • Selectable rated energizing input voltages of the directional earth-fault protection: 100 V, 110 V or 120 V • Four heavy-duty relays for CB tripping and five weak current relays for signalling purposes • Double-pole or single-pole circuit-breaker control • Five configurable control inputs for the external control of the protection stages and the auto-reclose module • Remote control of the circuit-breaker via the auto-reclose module • Local man-machine communication via push-buttons and a digital display on the front panels of the protection relay modules • Serial interface for connecting the relay to higher-level data acquisition systems, local or remote control systems or other host systems • Local fault indication by means of LED indicators with memory functions and the digital display • High immunity to electrical and electromagnetic interference • Continuous self-supervision of relay hardware and software for enhanced system reliability and availability • Auto-diagnostic fault indication to facilitate fault location and repair • Powerful software support for parameterization of the relay, for reading measured and recorded values, events, etc., and for storing readings • Member of the SPACOM product family and ABB’ s Distribution Automation system • CE marking according to the EC directive for EMC