Izračun dodatnih gubitaka zbog vrtložnih struja u folijskim namotima distribucijskih transformatora s ovalnom jezgrom

master's thesis

• Title (english): Calculation of stray losses due to eddy currents in foil windings of distribution transformers with oval core
• Author: Marija Vuković
• Mentor: Damir Žarko (mentor)
• Committee member: Damir Žarko (predsjednik povjerenstva)
• Committee member: Zlatko Hanić (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

Na primjeru distribucijskog transformatora poznate geometrije jezgre te geometrije VN i NN namota, primjenom 2D metode konačnih elemenata određeni su dodatni gubici zbog induciranih vrtložnih struja u folijskom namotu. Transformator je modeliran u uzdužnom i poprečnom presjeku i pomoću programa Simcenter MAGNET dobiveni su srednji gubici u vodičima folijskog namota. Pomoću tih rezultata, interpolacijom su dobivene vrijednosti koeficijenata skin efekta na cijelom opsegu namota za sve tri faze. Istražena je mogućnost analitičkog računa koeficijenata skin efekta. Pomoću metode konačnih razlika određene su gustoće struje unutar vodiča i gustoće gubitaka. Ti rezultati su uspoređeni sa rezultatima koji su dobiveni metodom konačnih elemenata.

Abstract (english)

Using an example of a distribution transformer with known core geometry, as well as the geometry of the HV (High Voltage) and LV (Low Voltage) windings, additional losses due to induced eddy currents in the foil winding were determined using the 2D finite element method. The transformer was modeled in the longitudinal and transverse sections, and Simcenter MAGNET software was used to obtain average losses in the conductors of the foil winding. Based on these results, interpolation was used to obtain values of the skin effect coefficients for the entire circumference of the winding. Skin effect coefficients were determined for all three phases. The possibility of analytically calculating the skin effect coefficients was investigated. Current densities within the conductors and loss densities were determined using the finite difference method. These results were compared with the results obtained using the finite element method.

• Keywords: skin efekt; distribucijski transformator; metoda konačnih razlika; koeficijent skin efekta; ovalna jezgra
• Keywords (english): skin effect; distribution transformer; finite difference method; skin effect coefficient; oval core
• Language: croatian
• URN:NBN: urn:nbn:hr:168:184505
• 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: 2023-07-13 10:40:48