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Title:RAZVOJ METODE ZA UGOTAVLJANJE FUNKCIONALNOSTI KOVINSKO OKSIDNIH ODVODNIKOV PRENAPETOSTI
Authors:ID Hrastnik, Jože (Author)
ID Pihler, Jože (Mentor) More about this mentor... New window
ID Hamler, Anton (Comentor)
Files:.pdf DR_Hrastnik_Joze_2011.pdf (4,08 MB)
MD5: 4D02E44748526EDFBD57E6332AC4EF85
PID: 20.500.12556/dkum/63615545-f1a8-4a34-8e1b-b72eef501e07
 
Language:Slovenian
Work type:Dissertation
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:Pravilno izbrani odvodniki prenapetosti lahko preprečijo delni ali celo popolni izpad napajalnih sistemov. Danes se v kovinsko oksidnih odvodnikih prenapetosti predvsem uporabljajo kovinsko oksidni varistorji, ki imajo izrazito nelinearno karakteristiko. Težavo pri njih predstavlja določanje funkcionalnosti kovinsko oksidnih odvodnikov prenapetosti med obratovanjem. Pojavlja se vprašanje, ali je odvodnik prenapetosti še vedno sposoben ustrezno ščititi naprave ali ne. V doktorski disertaciji so podrobno predstavljene laboratorijske meritve vpliva temperature kovinsko oksidnih odvodnikov prenapetosti na uhajavi tok, predstavljene so tudi laboratorijske meritve segrevanja odvodnikov prenapetosti v odvisnosti od ohmske komponente uhajavega toka. Izdelan je 3D računalniški model kovinsko oksidnega odvodnika prenapetosti, s katerim lahko analiziramo funkcionalnost odvodnikov prenapetosti v vseh možnih obratovalnih pogojih. 3D računalniški model omogoča določitev področij kovinsko oksidnih odvodnikov prenapetosti, ki so med obratovanjem dejansko termično najbolj obremenjena. Računalniški model je potrjen s pomočjo laboratorijskih meritev. V doktorski disertaciji smo na osnovi laboratorijskih meritev segrevanja kovinsko oksidnih odvodnikov prenapetosti v odvisnosti od ohmske komponente uhajavega toka in na osnovi teoretskih izračunov s pomočjo računalniškega 3D modela razvili novo metodo, s katero je možno določiti stanje kovinsko oksidnih odvodnikov prenapetosti med obratovanjem. Metoda temelji na osnovi razlike temperatur dveh področij kovinsko oksidnih odvodnikov prenapetosti. Z novo metodo lahko na osnovi meritve razlike temperatur dveh področij kovinsko oksidnih odvodnikov prenapetosti določimo vrednosti ohmske komponente toka in ugotovimo, ali je odvodnik prenapetosti še ustrezen za obratovanje ali ne.
Keywords:odvodnik prenapetosti, uhajavi tok, temperatura, metoda končnih elementov
Place of publishing:Maribor
Publisher:[J. Hrastnik]
Year of publishing:2011
PID:20.500.12556/DKUM-20514 New window
UDC:621.316.933(043.3)
COBISS.SI-ID:67698177 New window
NUK URN:URN:SI:UM:DK:CM6LI5AA
Publication date in DKUM:28.09.2011
Views:3271
Downloads:338
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FERI
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Secondary language

Language:English
Title:DEVELOPMENT OF METHOD FOR DETERMINING THE CONDITIONS OF METAL-OXIDE SURGE ARRESTERS
Abstract:Correctly selected surge arresters can prevent partial or even full outages of power supply systems. Modern metal-oxide surge arresters usually contain metal-oxide varistors which have very non-linear characteristics. The weak point is determination of condition of medium voltage surge arresters in given operating conditions. A question arises whether the surge arrester is still capable of protecting the devices or not? In the doctoral dissertation, there are presented laboratory measurements of the temperature affects of the metal-oxide surge arresters on leakage current in details. The dissertation also presents laboratory measurements of heating of the surge arresters, depending on the resistive component of leakage current. With constructed 3D computer model of metal-oxide surge arresters, we can analyse the functionality of surge arresters in all possible operating conditions. 3D computer model allows the identification of most temperature stressed areas of metal oxide surge arresters. A computer model has been confirmed by laboratory measurements. The new method was developed on base of laboratory measurements of surge arresters temperature as a function of resistive component of leakage current and on base FEM (Finite Element Method) analysis of metal-oxide surge arresters with 3D computer model. With this new method, it is possible to determine the functionality of metal oxide surge arresters in service. The new method is based on a temperature difference of two areas of metal oxide surge arresters. With this method, we can determine the value of the resistive component of the leakage current on the base of measurements of temperature differences of two areas of metal oxide surge arresters and find out if surge arrester is still suitable for further operation or if they need to be replaced.
Keywords:surge arrester, leakage current, temperature, finite element method


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