Zaštita tercijara transformatora

master's thesis

• Title (english): Protection of tertiary winding transformer
• Author: Mateja Bubnjar
• Mentor: Ante Marušić (mentor)
• Committee member: Ante Marušić (predsjednik povjerenstva)
• Committee member: Juraj Havelka (član povjerenstva)
• Committee member: Tomislav Capuder (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2016-07-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U radu je objašnjena razlika između tercijara i stabilizacijskog namota te je navedena njihova namjena i način djelovanja. Tercijar i stabilizacijski namot smanjuju nultu impedanciju transformatora, reduciraju treći harmonik napona te djeluju stabilizacijski u uvjetima nesimetričnog opterećenja. Za navedene namote dan je prijedlog štićenja od kratkog spoja i prenapona. Tercijari u Hrvatskoj uglavnom se ne terete, stoga se od kratkog spoja štite uzemljivanjem jednog izvoda. U slučaju da se tercijar tereti, može se primijeniti kapacitivno uzemljenje te je na provodne izolatore potrebno postaviti zaštitne šeširiće kako male životinje ne bi izazvale kratki spoj. Tercijar je najizloženiji sklopnim i prenesenim prenaponima, a njegova prenaponska zaštita izvodi se odvodnicima prenapona. U posljednjem poglavlju analizirani su kvarovi na tercijaru koji su se dogodili u transformatorskim stanicama u Zagrebu, Skopju, Osijeku i Turskoj.

Abstract (english)

This thesis explaines the difference between the tertiary and stabilization winding along with describing their purpose and working principle. Tertiary and stabilization winding reduce zero sequence impedance as well as third voltage harmonic and they have stabilizing effect in terms of unbalanced loads. For these windings the proposal of protection from short circuit current and overvoltages is given. Tertiary windings in Croatia are mainly not loaded, so they are earthed. If tertiary winding is loaded, capacitive earthing may be applied. Bushings must be covered with protective hats so small animals can not cause a short circuit. Tertiary winding is exposed to transferred and switching overvoltages and its protection is realized with surge arresters. The last chapter analyzes failures of the tertiary winding that took place in electrical substations in Zagreb, Skopje, Osijek and Turkey.

• Keywords: kratki spoj; kvarovi; prenaponi; stabilizacijski namot; tercijar; zaštita
• Keywords (english): failures; overvoltages; protection; short circuit current; stabilizing winding; tertiary
• Language: croatian
• URN:NBN: urn:nbn:hr:168:418557
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2018-02-06 08:04:29