Metoda izbora uređaja prenaponske zaštite u niskonaponskim sustavima

doctoral thesis

• Title (english): Method of Surge Protective Devices Selection in Low-Voltage Systems
• Author: Viktor Milardić
• Mentor: Ivo Uglešić (mentor)
• Committee member: Sejid Tešnjak (član povjerenstva)
• Committee member: Ivo Uglešić (član povjerenstva)
• Committee member: Maks Babuder (član povjerenstva); strani drzavljanin: Nije dostupno
• Committee member: Zdravko Hebel (član povjerenstva)
• Committee member: Ante Marušić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Energy and Power Systems); Zagreb
• Defense date and country: 2005-11-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Power Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

U disertaciji su najprije objašnjeni osnovni pojmovi te stanje prenaponske zaštite na niskom naponu i cilj rada. Zatim je objašnjeno nastajanje i djelovanje prenapona, gromobranska zaštita, uređaji prenaponske zaštite te prenaponska zaštita prema IEC normama. Parametri struje munje za različite klase gromobranske zaštite su implicirali uvođenje valnog oblika za ispitivanje uređaja prenaponske zaštite. Modeli za simulaciju energetskog opterećenja uređaja prenaponske zaštite detaljno su izloženi u trećem poglavlju. Karakteristike pojedinih elemenata modela su određene laboratorijskim ispitivanjima. Proveden je izbor parametara struje munje uzimajući u obzir vjerojatnost pojave struje određene amplitude i vremena trajanja. Detaljno su prikazani rezultati simulacija energetskog opterećenja uređaja prenaponske zaštite u NN mreži. Provedena je i analiza osjetljivosti modela na ulazne parametre. Simulacijama je pokazano da inducirani prenaponi ne mogu značajno energetski opteretiti uređaje prenaponske zaštite. Zaštitna udaljenost uređaja prenaponske zaštite je istraživana na posebnom modelu. Zaključak disertacije ističe, uvođenjem prihvatljivog rizika energetskog preopterećenja uređaja prenaponske zaštite može se riješiti nesuglasje oko valnog oblika za ispitivanja. Disertacija sadrži i popis literature zatim popis skraćenica, oznaka, slika i tablica, zatim četiri priloga, sažetak na hrvatskom i engleskom jeziku te životopis na hrvatskom i engleskom jeziku.

Abstract (english)

In dissertation, capital technical data are first explained, as well as the state of low-voltage surge protection and aim of dissertation. Afterwards are explained the origin and surge effect, lightning protection system, surge protective devices and surge protection according to IEC standards. The lightning current parameters for the different classes of lightning protection are implicated introduction of current wave shape for SPD testing. Models for simulation of SPD energy absorption are laid out in-depth in the third paragraph. Characteristics of single model elements are estimated by laboratory testing. Choices of lightning current parameters are performed, taking in account probability of lightning current amplitude and duration of lightning wave. The results of simulation of SPDs energy absorption in low-voltage line are shown in-depth. Sensitivity of model on calculation parameters is also analyzed. Simulation of induced overvoltages are shown, induced overvoltages cannot load SPDs with high energy. Protective distance of SPD is researched on special model. Conclusion of dissertation is pointed out; introduction of acceptable risk of SPD energy overloading can be solution for discrepancy about current wave shape for SPD testing. Dissertation includes also list of references, list of abbreviations and marks, list of pictures and tables, four supplements, summary and biography in Croatian and English.

• Keywords: Niski napon; prenaponska zaštita; uređaj prenaponske zaštite; prihvatljivi rizik energetskog preopterećenja; ispitni strujni val
• Keywords (english): Low-voltage; surge protection; surge protective device; acceptable risk of energy overloading; current wave shape for testing
• Language: croatian
• URN:NBN: urn:nbn:hr:168:437464
• Study programme: Title: Doctoral study programme "Electrical Engineering and Computing"; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, po-dručje tehničkih znanosti (doktor/doktorica znanosti, po-dručje tehničkih znanosti)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-07-05 08:38:11