www.elvac.eu Marian Kuruc RTU protections - news Ostrava 2015
Energetics RTU protections
RTU RTUs for control, protection, data acquisition and communication Content Redesigned block of protections Global setting of measurement ranges Circuit breaker configuration Open/close counter Circuit breaker open failure detection Protection group selection according to the active power flow Negative sequence evaluation for current and voltage unbalance Frequency protection df/dt – frequency change, 2 levels Directional earth fault protection – added parameter characteristic angle and active sector www.elvac.eu | www.rtu.cz Own products
RTU RTUs for control, protection, data acquisition and communication Global setting of measurement ranges Unified editing of ranges for AI, protections, fault records www.elvac.eu | www.rtu.cz Own products
RTU RTUs for control, protection, data acquisition and communication Circuit breaker configuration Circuit breaker open failure detection If circuit breaker status change fails (t > Max. time of line shutting down) RTU will automatically send signal VDI369 to SCADA Circuit breaker open/close counter Counter value is saved in NVRAM Can be set/cleared from SCADA www.elvac.eu | www.rtu.cz Own products
RTU RTUs for control, protection, data acquisition and communication Protection group selection according to the active power flow Automatically changes protection group according to sign of active power P and configured delay www.elvac.eu | www.rtu.cz Own products
RTU RTUs for control, protection, data acquisition and communication Negative sequence evaluation for current and voltage unbalance Unbalance limit is given as the ratio of negative sequence component to positive sequence, expressed in percentage www.elvac.eu | www.rtu.cz Own products
RTU RTUs for control, protection, data acquisition and communication Frequency protection df/dt Two stages df/dt, where dt = 100ms and df > „Frequency limit“ Protection is tripping when df/dt takes longer than parameter „min. duration of threshold break“ www.elvac.eu | www.rtu.cz Own products
RTU RTUs for control, protection, data acquisition and communication Directional earth fault protection Characteristic angle (0°÷180°), active section (0°÷90°), directionality Wattmetric functionality Up to 8 earth fault protections Used for different neutral point arrangements (isolated, resistance earthed, compensated) www.elvac.eu | www.rtu.cz Own products
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