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Title:Analiza občutljivosti zemeljskostične zaščite srednjenapetostnih razdeljevalnih omrežij : magistrsko delo
Authors:ID Černezel, Martin (Author)
ID Polajžer, Boštjan (Mentor) More about this mentor... New window
ID Rošer, Miran (Comentor)
Files:.pdf MAG_Cernezel_Martin_2023.pdf (7,95 MB)
MD5: 0F3D42E91EACC0EECEA63D2D7EBDAF34
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:Cilj sodobnih srednjenapetostnih omrežij je učinkovito, varno in zanesljivo razdeljevanje električne energije ustrezne kakovosti. Eden izmed glavnih vzrokov prekinitve napajanja so enofazne zemeljskostične okvare (EZSO), ki predstavljajo tudi potencialen vir poškodb živim bitjem. V magistrskem delu smo analizirali delovanje različnih neusmerjenih in usmerjenih zemeljskostičnih zaščitnih kriterijev zaščitnih relejev (ZR), ki zaznavajo EZSO. Analiza obravnavanih kriterijev je bila opravljena na rezultatih simulacij EZSO v dinamičnem modelu srednjenapetostnega omrežja razdelilne transformatorske postaje (RTP) Slovenj Gradec. Pri tem smo upoštevali tri različne načine ozemljitve nevtralne točke (NT) RTP, dve topologiji omrežja, šest različnih upornosti EZSO do 1000 Ω ter dva trenutka nastanka okvare. Z obravnavanimi kriteriji smo ustrezno zagotovili selektivno delovanje vseh ZR-jev za radialno in zazankano topologijo omrežja ne glede na način ozemljitve NT RTP-ja ali upornosti okvare. Rezultate analize neusmerjenih in usmerjenih zemeljskostičnih zaščitnih kriterijev smo preverili z odprto-zančnim preizkušanjem ZR-ja ABB-REF615, pri čemer smo uporabili preizkuševalno napravo Omicron CMC 256-6. Preizkuse smo izvedli s pomočjo dinamičnega modela testnega omrežja, ki je vključeval modele tokovnih in napetostnih merilnih transformatorjev. Rezultati preizkusa ZR-ja ABB-REF615 so potrdili rezultate analize obravnavanih zemeljskostičnih zaščitnih kriterijev.
Keywords:Enofazne zemeljskostične okvare, nadtokovna zemeljskostična zaščita, usmerjena zemeljskostična zaščita, odprto-zančni preizkus zaščitnega releja, sekundarno preizkušanje
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[M. Černezel]
Year of publishing:2023
Number of pages:1 spletni vir (1 datoteka PDF (VII, 104 f.))
PID:20.500.12556/DKUM-84513 New window
UDC:621.316.97(043.2)
COBISS.SI-ID:158068483 New window
Publication date in DKUM:03.07.2023
Views:791
Downloads:179
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FERI
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:16.06.2023

Secondary language

Language:English
Title:Analysis of sensitivity of ground fault protection in medium voltage distribution networks
Abstract:The objective of modern medium-voltage networks is the efficient, safe and reliable distribution of electrical energy with adequate power quality. One of the main causes of power interruptions is single-phase-to-ground faults (SPGFs), which are also a potential source of harm to living beings. In this master thesis, we analysed the performance of different non-directional and directional ground-fault protection criteria of protection relays (PRs), which detect SPGFs. The discussed criteria were analysed based on the simulation results of SPGFs using a medium voltage network dynamic model with a transformer substation (TS) Slovenj Gradec. The fault simulations considered three different groundings of the neutral point (NP) of a TS, two different network topologies, six different resistances of an SPGF with up to 1000 Ω and two faults inception angles. The discussed criteria appropriately ensured the selective operation of all PRs within the radial and closed-loop network topology, regardless of the grounding of the TS-NP or fault resistances. The non-directional and directional ground-fault protection criteria analysis results were verified through open-loop testing of a PR ABB-REF615 using the Omicron CMC 256-6 testing device. Tests were based on a dynamic model of a testing network, including current and voltage-measuring transformers models. The test results of the PR ABB-REF615 confirmed the analysis results of the considered ground-current protection criteria.
Keywords:Single-phase-to-ground faults, overcurrent ground fault protection, directional ground fault protection, open-loop protective relay test, secondary testing


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