Prenaponi strmog čela u sekundarnim krugovima visokonaponskih rasklopnih postrojenja

scientific master's theses

• Author: Viktor Milardić
• Mentor: Ivo Uglešić (mentor)
• Committee member: Ante Marušić (član povjerenstva)
• Committee member: Ivo Uglešić (član povjerenstva)
• Committee member: Maks Babuder (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Energy and Power Systems); Zagreb
• Defense date and country: 2001-03-08, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Problematika utjecaja primarne opreme visokonaponskih rasklopnih postrojenja te prirodnih elektromagnetskih fenomena na sekundarnu opremu može se obuhvatiti općenitim pojmom kao problematika elektromagnetske kompatibilnosti u postrojenjima elektroenergetskog sustava. Najznačajniji aspekt te problematike su prenaponi strmog čela u sekundarnim krugovima. Nakon uvodnog dijela, u drugom dijelu su date osnovne definicije i klasifikacije prema IEC-u. U trećem dijelu rada prikazana je problematika prenapona u sekundarnim krugovima visokonaponskih rasklopnih postrojenja. Tu su detaljno rasčlanjeni atmosferski utjecaji i sklopne manipulacije. Također, u tom poglavlju su detaljno obrađeni mehanizmi prijenosa između izvora smetnje i prijemnika posebno kod klasičnih a posebno kod plinom izoliranih rasklopnih postrojenja. Koncept zaštitnih zona u zaštiti od munje kao mjera za postizanje željene elektromagnetske kompatibilnosti prikazan je u četvrtom poglavlju. Primjena takvog koncepta te nužnost interdisciplinarnog rada svih učesnika u projektu također je objašnjena u tom poglavlju. U petom poglavlju su prikazana dva računalna programa za simulaciju udara munje. Dati su matematički modeli koji su implementirani u programe te su također rezultati simulacije uspoređeni na konkretnom rasklopnom postrojenju. Rezultati simulacije iz prethodnog poglavlja korišteni su u šestom poglavlju kao ulazni podaci za proračun tranzijentnih porasta potencijala uzemljivača. U ovom poglavlju je prikazan samo mali dio proračuna koji su urađeni. U sedmom poglavlju su prikazane obuhvatne zaštitne mjere koje su rasčlanjene na mjere protiv nastanka uzdužnog i poprečnog napona. U tom poglavlju su, između ostalog, prikazani zaštitni elementi koji se mogu koristit kao dodatne zaštitne mjere na sekundarnoj strani. Za neke od tih elemenata snimljeni su i odzivi pri nailasku prenapona strmog čela. U zaključku su date najvažnije smjernice pri gradnji novih i rekonstrukciji postojećih visokonaponskih postrojenja koje su proizišle kao rezultat rada na problematici prenapona strmog čela u sekundarnim krugovima.

Abstract (english)

Influence problems of primary equipment of high voltage switchgear and natural electromagnetic phenomena on secondary equipment can be clasped with general notion like electromagnetic compatibility problems in switchgear of electricity system. The most important fact of that problem are fast and very fast overvoltages in secondary (low voltage) circuits. After introduction part, in second part were given fundamental definitions and classes according to IEC norms. In third part were presented overvoltage problems in low voltage circuits of high voltage switchgear. In this part were detail divided lightning influence and switching operation influence. Also, in this part were detail described transfer mechanisms between source of disturbance and receiver of disturbance by classic switchgear and by gas insulated switchgear. Concept of protection area in lightning protection, like measure of electromagnetic compatibility, was presented in fourth part. Application of that concept and necessity of interdisciplinary work of all members in project was also explained in this part. In fifth part were presented two computer programs for lightning stroke simulation. In this part was also given mathematics models, which were implemented in programs. Results were also compared on concrete switchgear. Results of simulations from preliminary part were used in sixth part like introduction data for calculation of transient potential rise of grounding grid. In this part was presented only a little piece of calculation, which were made. In seventh part were presented encircle protection measures. These were divided into measures against common-mode voltage and measures against line to ground voltage. In this part were presented, between others, protection element that can be used like addition protection measures on second side (in low voltage circuits). For certain of those elements were recorded responses on fast-front overvoltages. In conclusion were given the most important directions by building of new and reconstruction of existing high voltage switchgear. These directions are results of work on problems of fast-front overvoltages in secondary low voltage circuits.

• Keywords: Elektromagnetska kompatibilnost; prenaponi strmog čela; sekundarni krugovi; gromobranska zaštita
• Keywords (english): Electromagnetic compatibility; fast-front overvoltages; secondary circuits; lightning protection
• Language: croatian
• URN:NBN: urn:nbn:hr:168:681243
• Study programme: Title: Postgraduate master programme in electrical engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-04-15 13:15:30