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Title:ZMANJŠANJE INDEKSA TRENUTNE POVPREČNE FREKVENCE PREKINITEV NAPAJANJA V SISTEMU MAIFI OB PREHODU IZ INDIREKTNO OZEMLJENE NA RESONANČNO OZEMLJENO SN NEVTRALNO TOČKO TRANSFORMATORJA
Authors:Svetlin, Saša (Author)
Voršič, Jože (Mentor) More about this mentor... New window
Štumberger, Gorazd (Co-mentor)
Files:.pdf UNI_Svetlin_Sasa_2009.pdf (974,35 KB)
 
Language:Slovenian
Work type:Undergraduate thesis (m5)
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:Na praktičnem primeru je predstavljeno zmanjšanje indeksa trenutne povprečne frekvence prekinitev napajanja v sistemu MAIFI ob prehodu iz indirektno ozemljene na resonančno ozemljeno srednjenapetostno nevtralno točko transformatorja, s čimer se občutno izboljša kakovost oskrbe z električno energijo. Resonančna dušilka namreč kompenzira vse bežne enofazne zemeljskostične okvare, ki samougasnejo v času krajšem od 7s, teh pa je v omrežju največ. V primeru, da so okvare daljše, pa se paralelno k dušilki priključi obstoječi upor, ki zagotovi pogoje za cikel avtomatskega ponovnega vklopa. Resonančno ozemljena nevtralna točka največ doprinese k izboljšanju oskrbe na omrežjih pretežno grajenih z zračnimi daljnovodi izvedenimi z golimi vodniki, ki potekajo preko težavnih in poraščenih terenov.
Keywords:kakovost oskrbe, zanesljivost, prekinitev, indeks, ozemljitev nevtralne točke, odjemalec, zemeljskostična zaščita, transformator
Year of publishing:2009
Publisher:[S. Svetlin]
Source:Maribor
UDC:621.316.99(043.2)
COBISS_ID:13296918 Link is opened in a new window
NUK URN:URN:SI:UM:DK:WWYFKC6N
Views:2242
Downloads:221
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FERI
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Secondary language

Language:English
Title:REDUCTION OF MOMENTARY AVERAGE INTERRUPTION FREQUENCY INDEX MAIFI BY CROSSING FROM IMPEDANCE EARTHED NEUTRAL SYSTEM TO RESONANT EARTHED NEUTRAL SYSTEM
Abstract:On the practical example is presented reduction of momentary average interruption frequency index MAIFI by passing from impedance earthed neutral system to resonant earthed neutral system. By this the quality of power supply is perceptible better. The resonant coil namely compensates all of the momentary phase-to-earth fault's currents self-exinguished in time shorter than seven seconds, which are the most frequently in medium voltage electrical power network. In case the phase-to-earth fault is longer than seven seconds the existent low impedance resistor is connected parallel to the resonant coil and the conditions for activity of avtomatic reclosing are assured. There is most contributiont to the reduce frequency of momentary interruption by passing to the resonant earthed system on the network mostly made by overhead line with aluminium conductors, which lines over hard land and woodland.
Keywords:quality of power supply, continuty of power supply, interruption, index, neutral point connection, customer, earth-fault protection, transformer


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