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    <ns1:title language="sr">Predikcija stanja izolacionog sistema visokonaponske elektroenergetske opreme primenom zakona porasta verovatnoće</ns1:title>
    <ns2:subtitle language="sr">doktorska disertacija</ns2:subtitle>
    <ns2:alt_title language="en">Prediction of high-voltage equipment’s insulation system status by applying law on increasing probability : doctoral dissertation</ns2:alt_title>
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    <ns1:description language="sr">Predmet istraživanja doktorske disertacije su modelovanje i procesi starenja izolacionihsistema visokonaponskih objekata (obrtne mašine, kablovi). Modelovanje se odnosi nautvrđivanje važenja zakona porasta verovatnoće nekog ishoda za model i n puta uvećanirealni objekat (uvećana površina, broj elemenata i dr.). Takođe, i algoritami za procenuradnog veka i preostalog životnog veka se oslanjaju na verovatnoću ishoda, prag naponaparcijalnih pražnjenja – PDIV (Partial Discharge Inception Voltage), probojni napon – VBD(Voltage Breakdown) kao mere degradacije (starenja) odnosno pouzdanosti izolacionogsistema visokonaponskog (VN) objekata tokom vremena eksploatacije. Metodeistraživanja su teorijske i eksperimentalne. Teorijski su izučavani izolacioni sistemi,stohastičnost posmatranih ishoda, matematička statistika. Tako su određeni konceptieksperimenata (uzorci, merna oprema). Za obrtne mašine korišćeni su reprezentativniuzorci izolacionih sistema (formirani karakteristični uzorci prema skali 1:n, određeneceline sistema i celi objekti). Za srednjenaponske kablove je korišćen veći broj formiranihuzoraka. Rezultati ispitivanja su pokazali da je moguće formirati modele izolacionihsistema i na pouzdan način ekstrapolirati ispitivane veličine na realan objekat. Takođe,rezultati su pokazali da je moguće procenjivati životni vek izolacionih sistema u složenimuslovima eksploatacije. Istraživanja su aktuelna i u skladu sa trendovima razvojasavremenih izolacionih sistema. Rezultati istraživanja su doprinela boljem razumevanjuosobenosti visokonaponskih izolacionih sistema, unapređenju metoda i postupakaispitivanja i dijagnostike stanja kako novoproizvedenih, tako i VN jedinica u pogonu.Takođe su unapređene metode i postupci procene radnog i preostalog životnog veka. Tomože doprineti racionalizaciji i finansijskim efektima u proizvodnji i eksploataciji VNobjekata i korektivnom održavanju na produženju životnog veka. </ns1:description>
    <ns1:description language="en">The subject of the doctoral dissertation research is modeling and aging processes ofinsulation systems of high-voltage objects (rotating machines, cables). Modeling refers todetermining the validity of the law of increasing probability of outcomes for a model anda real object enlarged n times (increased area, number of elements, etc.). Also, thealgorithms for estimating the working life and the remaining life rely on the probabilityof the outcome, Partial Discharge Inception Voltage – PDIV , Breakdown Voltage - VBD) asa measure of degradation (aging) of the insulation system during the operation period.Research methods are theoretical and experimental. Isolation systems, stochasticity ofobserved outcomes, mathematical statistics were theoretically studied. This is how theconcepts of the experiments (samples, measuring equipment) were determined. Forrotation machines, representative samples of insulation systems were used(characteristics samples formed according to the 1:n scale, individual parts of the system,and entire objects). A larger number of formed samples were used for medium voltagecables. The test results showed that it is possible to form models of insulation systemsand reliably extrapolate the tested quantities to a real object. Also, the results showed thatit is possible to estimate the lifetime of insulation systems in complex operatingconditions. The research is according to the development trends of modern insulationsystems. The results of the research contributed to a better understanding of thepeculiarities of high-voltage insulation systems, improvement of methods and proceduresof testing and diagnostics of the state of both newly manufactured and HV units inoperation. Methods and procedures for estimating service life and remaining life have alsobeen improved. This can contribute to rationalization and financial effects in theproduction and exploitation of HV facilities and corrective maintenance to extend the lifespan.</ns1:description>
    <ns1:description language="sr">Elektrotehnika - elektroenergetika / electrical engineering - electroenergetics  
Datum odbrane: 26.03.2024. </ns1:description>
    <ns1:keyword language="sr">starenje, životni vek, izolacioni materijali, električne mašine, srednjenaponski kablovi, zakon porasta, parcijalna pražnjenja, probojni napon</ns1:keyword>
    <ns1:keyword language="en">ageing, lifetime, insulating materials, electrical machines, medium voltage cables, growth law, partial discharges, breakdown voltage</ns1:keyword>
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