SLIDE 1
Marian Kuruc
Ostrava 2015
RTU protections - news
www.elvac.eu
RTU protections - news Ostrava 2015 Energetics RTU protections - - PowerPoint PPT Presentation
RTU protections - news Ostrava 2015 Energetics RTU protections - - PowerPoint PPT Presentation
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
SLIDE 2
SLIDE 3
RTU 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
RTUs for control, protection, data acquisition and communication
Content
Own products
SLIDE 4
RTU
www.elvac.eu | www.rtu.cz
Global setting of measurement ranges
RTUs for control, protection, data acquisition and communication Own products
Unified editing of ranges for AI, protections, fault records
SLIDE 5
RTU
www.elvac.eu | www.rtu.cz
Circuit breaker configuration
RTUs for control, protection, data acquisition and communication Own products
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
SLIDE 6
RTU
www.elvac.eu | www.rtu.cz
Protection group selection according to the active power flow
RTUs for control, protection, data acquisition and communication Own products
Automatically changes protection group according to sign of active power P and configured delay
SLIDE 7
RTU
www.elvac.eu | www.rtu.cz
Negative sequence evaluation for current and voltage unbalance
RTUs for control, protection, data acquisition and communication Own products
Unbalance limit is given as the ratio of negative sequence component to positive sequence, expressed in percentage
SLIDE 8
RTU
www.elvac.eu | www.rtu.cz
Frequency protection df/dt
RTUs for control, protection, data acquisition and communication Own products
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“
SLIDE 9
RTU
www.elvac.eu | www.rtu.cz
Directional earth fault protection
RTUs for control, protection, data acquisition and communication Own products
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)
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O Společnosti
Thank you for your attention
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