Blar i Institutt for elkraftteknikk på tittel
Viser treff 1212-1231 av 2419
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Investigating thermal management solutions in a modular high voltage machine for offshore wind applications
(Master thesis, 2021)The energy market of the world is in continuous development. For energy transmission, high voltage is now being used more frequently for long transmission distances. Especially between countries, both onshore and offshore. ... -
Investigating Transient Overvoltages due to Multiple Reignitions when Switching Small Inductive Loads
(Master thesis, 2023)I denne rapporten undersøkes de transiente overspenningene som produseres fra åpningen av en vakuumbryter i et mellomspennings smelteverk. En fiktiv modell av et smelteverk med korte kabellengder ble laget i ATPDraw. De ... -
Investigation into the impact of thermal energy flexibility on cost optimal design and operation of Zero Emission Buildings
(Master thesis, 2019)Zero Emission Buildings (ZEB) er energieffektive bygninger som produserer fornybar energi "on-site", for å kompensere for forbruk. ZEB-konseptet er basert på rapporten fra EUs direktiv om energieffektivitet av bygninger ... -
Investigation of a Concept for Simultaneous Reliquefaction of Boil-Off-Gas and Vaporization of LNG for Marine Atmospheric LNG Fuel Tanks
(Master thesis, 2014)The aim of this thesis is to design and optimize a heat pump process to reliquefy Boil-Off-Gas from Liquefied Natural Gas (LNG) cryogenic tanks, and simulataneously vaporize LNG at high pressure.The process is meant for ... -
Investigation of a Four Level Voltage Active Gate Driver for Loss and Slope Control of SiC MOSFETs
(Master thesis, 2022)denne masteroppgaven blir en styrekrets for silikon karbid metall-oksid-halvleder felteffekttransistorer (SiC MOSFET) introdusert. Denne styrekretsen introduserer midlertidige spenningsnivå som kan styres både i lengde og ... -
Investigation of AC and DC power distributions to seafloor mining equipment
(Chapter, 2017)The main goal of this paper is to study and compare different power distribution alternatives for subsea electrical components for deep-sea mining in the Norwegian Sea. Such application requires power delivery in the ... -
Investigation of Cogging Torque of a Downhole Drilling Machine and Optimization of Electrical Machine
(Master thesis, 2012)This paper is a report on master thesis project conducted in cooperation with SMARTMOTOR AS and NTNU. The research for electrical downhole drilling machine has developed for decades. Permanent Magnet is a new addition in ... -
Investigation of Contact Erosion and Arc-Welding in a Medium Voltage Switching Device Using COMSOL
(Master thesis, 2019)Denne master oppgaven omhandler effektene lysbuen hadde på en mellomspennings effektbryter under lukkeoperasjoner. Hovedmålet for oppgaven var å finne den totale kontakterosjonen og styrken på lysbuesveisen etter at lukking ... -
Investigation of Dielectric Response Measurement as a Tool to Detect Copper Sulphide on Insulation Paper
(Master thesis, 2008)Several power transformers has, during the last two decades, broken down due to the copper sulphideproblem. Corrosive sulphur reacts with the copper conductor contaminating the surroundinginsulating paper. To this day there ... -
Investigation of Electrical Properties of a new low-GWP Insulation Gas - Comparison of AirPlus and Synthetic Air
(Master thesis, 2018)Sulfur hexafluoride (SF6) is a widely used insulation gas in medium- to high-voltage equipment due to its excellent dielectric properties. It has however one important weakness; a large global warming potential (GWP) of ... -
Investigation of Interior Permanent Magnet Machines with Concentrated Windings for High Dynamics Applications
(Master thesis, 2015)Interior permanent magnet (IPM) machines and non-overlapping concentrated windings (CW) are two design philosophies that have grown in popularity over the last decade. This is due to the many benefits and flexibility they ... -
Investigation of Loss Calculation Methods for PMSMs and Implementation of Loss Functionality on a Developed FEM Model
(Master thesis, 2016)Accurate estimation of losses is one of the major challenges in electromagnetic machinery modelling. Where permanent magnet synchronous machines are attractive for high performance applications, making them relevant for ... -
Investigation of magnetic field and radial force harmonics in a hydrogenerator connected to a three-level NPC converter
(Chapter, 2017)This paper investigates spatial and time harmonics of flux density and radial force distributions in the airgap of a hydrogenerator with fractional-slot windings. Hydrogenerator is connected to a neutral-point-clamped (NPC) ... -
Investigation of Open-Loop Predictor Implementation Methods for Online Parameter Estimation of IPMSM
(Chapter, 2022)Due to the sensitivity to parametric errors, open-loop current predictor-based estimators offer good online tracking of electric machine parameters, however at the price of rotor-speed dependent predictor pole-trajectories, ... -
Investigation of parasitics and thermal performance of a SiC MOSFET power module using FEM and LTSpice
(Master thesis, 2020)I denne masteroppgaven analyseres ytelsen til SiC halvbro-modulen CAS300M12BM2 fra Cree gjennom datasimuleringsverktøy. De viktigste bidragsyterne til parasittisk induktans i modulen har blitt identifisert og deres innvirkning ... -
Investigation of Partial Discharges in AlN Substrates under Fast Transient Voltages
(Peer reviewed; Journal article, 2022)The objective of this paper is to characterize partial discharge (PD) inception voltages and patterns at sinusoidal and square voltages in insulating ceramic substrates with generic manufacturing defects. PD tests were ... -
Investigation of PD formation on AlN Ceramic Substrates: Impact of Square Voltage Pulses and Dielectric Liquids
(Master thesis, 2023)Det elektriske kraftsystemet gjennomgår en kompleks utvidelse og opplever raske spenningsendringer som skyldes endringer i driftsmønsteret. Disse forholdene har betydelig innvirkning på komponenter og utstyr i strømnettet, ... -
Investigation of Permanent Magnet Machines for Downhole Applications: _ Design, Prototype and Testing of a Flux-Switching Permanent Magnet Machine
(Doctoral Theses at NTNU, 1503-8181; 2011:23, Doctoral thesis, 2011)The current standard electrical downhole machine is the induction machine which is relatively inefficient. Permanent magnet (PM) machines, having higher efficiencies, higher torque densities and smaller volumes, have widely ... -
Investigation of polymer ablation and AirPlus^TM for load current interruption of medium voltage systems
(Master thesis, 2022)Bruken av koblingutstyr er uunngåelig i ethvert strømnett, da de kontrollerer effektflyten i systemet. Denne masteroppgaven har hovedsakelig fokusert på bryting av laststrømmer for mellomspenningssystemer. Bryterteknologi ... -
Investigation of series connected SiC MOSFETs in a low inductive layout
(Master thesis, 2022)I denne masteroppgaven ble to kraft-halvleder moduler designet med mål om å oppnå et lav inductivt design samtidig som det opprettholdes sikker drift under høyspennings- og temperaturforhold. Kraft-halvleder modulene ble ...