Description
Features • Line differential functionality comprises; - phase segregated current differentialmeasurement evaluating both magnitude and phase angle - increased stabilisation through CT saturation detector - continuous compensation of transmission delay, enabling use of routeswitched communication networks - transfer trip within the digital communication channel - master/master design - interfaces for multiplexed connections,direct fibre or pilot wires • Additional protection functionality such as; - phase and residual current functions - breaker failure protection - fast interbay communication of binarysignals - current circuit supervision - single - or multi -pole tripping • Control; - command control - autoreclosing • Monitoring; - event recorder- disturbance recorder - trip value recorder - status indication of all input and internalbinary signals - presentation of measured mean valuesof line current and frequency with accuracy up to 0.25% • Metering; - pulse counter logic • Remote-end data communicationalternatives; - multiplexed, dedicated fibre andgalvanic channel - communication channel supervision • Serial communication; - SPA or IEC 870-5-103 port (monitoring) - LON port (control) • Extensive configuration possibilities by useof internal logical gates, timers and userconfigurable connections between different functions, binary inputs and outputs • Several input/output module options including measuring mA input module (for transducers) • Extensive software ’tool-box’ for monitoring, evaluation and user configuration ofthe terminal • Flexible software and hardware
Features (cont’d) • Selected processor design guaranteeshigh availability together with excellentpossibilities for extensive combination ofdifferent functions without prolonging theoperation time • Numerical filtering and measuring techniques ensuring correct performance during transient conditions • Versatile local human-machine interface(HMI) from the front panel • Various local HMI language options • Extensive self-supervision with faultdiagnostics
The REL551 line differential protection terminal is the basic unit for distribution, subtransmission and transmission line differential protection applications and forms a partof a PANORAMA Station Automation. ThePANORAMA Station Automation conceptincludes a complete range of single-functionunits and multi-functional terminals, Substation Monitoring System (SMS) and Substation Control System (SCS). The units in thePANORAMA concept are available as standalone relays/terminals or as building blocks ina total power network management system.
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