Upotreba induktivnog naponskog transformatora za izbijanje zaostalog naboja električnih vodova

master's thesis

• Title (english): The use of the inductive instrumental transformer for the discharge of the residual charge of the power lines
• Author: Andrea Križan
• Mentor: Zlatko Hanić (mentor)
• Committee member: Zlatko Hanić (predsjednik povjerenstva)
• Committee member: Damir Žarko (član povjerenstva)
• Committee member: Stjepan Stipetić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2023-06-28, Croatia

Abstract

Kako bi se spriječili kvarovi u elektroenergetskom sustavu nakon pojave prekida, nužno je osigurati siguran put za izboj zaostalog naboja. Praktičnim rješenjem su se pokazali mjerni transformatori. Budući da kod mjernih transformatora parametri na sekundarnoj strani tipično nemaju prevelik utjecaj na parametre na primarnoj strani, opravdano je promatrati samo primaran krug transformatora. Zbog velikih iznosa istosmjerne struje izboja, jezgra vrlo brzo uđe u zasićenje stoga je induktivitet primarnog namota jednak onomu koji bi bio u zasićenju. Nakon odabira optimalne metode za određivanje iznosa tog induktiviteta i imajući u vidu ova pojednostavljenja, razvijen je analitički model koji opisuje izboj i pomoću kojeg su određene termičke posljedice izboja na nekoliko transformatora. Kako bi se sagledao mehanički utjecaj izboja i odredili iznosi sila, na istim transformatorima provedeni su numerički proračuni pomoću metode konačnih elemenata.

Abstract (english)

In order to prevent damage in the power system after a disruption occurs, it is necessary to provide a safe path for the discharge of the residual charge. Instrument transformers have proven to be practical solutions. Since with instrument transformers the parameters on the secondary side typically have little influence on the parameters on the primary side, it is justified to consider only the primary circuit of the transformer. Due to the high levels of direct current during discharge, the core quickly saturates, resulting in the primary winding having the same inductance as it would in saturation. After selecting the optimal method for determining the value of this inductance and taking these simplifications into account, an analytical model was developed that describes the discharge and helps determine the thermal consequences of the discharge on several transformers. In order to assess the mechanical impact of the discharge and determine the magnitude of forces, numerical calculations using the finite element method were performed on the same transformers.

• Keywords: izboj; mjerni transformator; zaostali naboj; metoda konačnih elemenata; analitički model
• Keywords (english): line discharge; instrument transformer; residual charge; finite element method; analytical model
• Language: croatian
• URN:NBN: urn:nbn:hr:168:892897
• 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: 2023-10-11 09:26:24