Description
Features • Phase segregated line differential protection • Current differential measurement evaluatingboth magnitude and phase angle • Master/master design • Settable through current stabilization • Current transformer saturation detector increasing the degree of stabilization • Operation time typically 28 ms • Single pole tripping • CT Supervision function • Digital communication • Continuous compensation of transmissiondelay, enabling use of route switched communication network • MUX-ed 56/64 kbiVs channels complying toCCITT and EIA standards can be used • Built in communication for dedicated opto fibresup to 30 km • Additional communication options for dedicatedopto fibres up to 120 km • Short range modem for optical communicationto multiplexer up to 5 km. • Built in modem for communication over 1wistedpair cable up to 4 km. • Galvanic interface for connection to mul1iplexer. • Direct intertrip function within the digital commu-nication channel • Communication channel supervision • Numerical filtering and measuring techniquesensuring correct performance during transientcondition • Versatile man machine communication from thefront of the protection and two optional built-inserial ports • Extensive self supervision with fault diagnostics • Event reports from the last ten disturbanceswith up to 150 time tagged events for each disturbance • The following optional functions are available: - Three zone distance protection function withcommunication logic - Non-directional earth fault current protection - Directional earth fault current protection withcommunication logic - Accurate fault locator - Three or single pole autoreclosing - Synchrocheck - Breaker failure protection - Disturbance recorder with up to 10 analogueand 48 binary signals
The REL561 line differential protection terminal is the basic unit for sub-transmissionand transmission line differential protectionapplications and forms a part of aPANORAMA 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.
Features (cont’d) • 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 • 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
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