Browsing Institutt for elkraftteknikk by Title
Now showing items 1790-1809 of 2570
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Parallel Computing and Optimization with COMSOL Multiphysics
(Master thesis, 2017)In this thesis the parallel capabilities of COMSOL Multiphysics are investigated. A description for how one can run COMSOL on a Linux cluster is presented. The speedup was found to be poor for medium-sized simulations ... -
Parallel Operation of Synchronous Generators in a DC Grid
(Master thesis, 2021)I denne masteroppgaven, blir en modell for to synkrongeneratorer i et DC nett utviklet. Modellen er hovedsakelig utviklet i Simulink og består av to generatorer med en governor og excitation system hver. Hver generator ... -
Parallel processing of optimization algorithms: A faster way to optimize electric power problems that utilize FEM-simulations
(Master thesis, 2014)The aim of this thesis was to find a way of doing optimizations based on FEM-simulations and further to parallelize the computations in order to decrease the execution time. If proven possible the difficulty setting up ... -
Parameterovervåkning i tunnelanlegg ved bruk av LoRaWAN-basert IoT-system
(Bachelor thesis, 2023)Sammendrag Følgende rapport beskriver gjennomføring av bacheloroppgaven ved studieretningen Elektronikk og Sensorsystemer som tilhører programmet Bachelor i ingeniørfag, Elektro ved Norges Teknisk-Naturvitenskapelige ... -
Parasitic capacitances and inductances hindering utilization of the fast switching potential of SiC power modules. Simulation model verified by experiment
(Chapter, 2017)This paper investigates the switching performances of two state-of-the-art half-bridge SiC MOSFET modules using a standard double pulse test methodology. A deliberate choice of the modules with the same voltage and current ... -
Partial Discharge Activity in Rotating Machine Type II Insulation Systems as a Function of Temperature and AC Supply Frequency
(Peer reviewed; Journal article, 2023)The main purpose of this study was to investigate if the application of very low frequencies for PD measurements in type II generator bar insulation is relevant when compared to applying power line frequency at different ... -
Partial Discharge Characterization of New Environmentally Friendly Insulating Liquids
(Master thesis, 2024)Uønsket sammenbrudd av isolasjon er en av de viktigste utfordringene som påvirker påliteligheten til kraftsystemer. Væskeisolasjon brukes ofte i strømnett og undervannsinstallasjoner på grunn av sine foretrukne egenskaper, ... -
Partial Discharge Detection in Power Electronic Substrates Exposed to Pulse Voltage Waveforms
(Master thesis, 2018)An increasing number of power electronic converters are integrated in power systems. The fundamental functionality of electronic converters is turning on and off semiconductor switches to form the wanted voltage shape. ... -
Partial Discharge Inception in Ceramic Substrates Embedded in Silicone Liquid, Silicone Gel, and Mineral Oil at Fast Voltage Rise and Sinusoidal Voltage
(Journal article; Peer reviewed, 2024)This paper summarizes experiments that were carried out on insulating ceramic substrates and a needle-plane arrangement with the purpose to characterize the inception of partial discharges (PD) in the insulation of ... -
Partial Discharge Inception Voltage of Voids Enclosed in Epoxy/Mica versus Voltage Frequency and Temperature
(Journal article; Peer reviewed, 2020)Detection of partial discharges (PDs) is widely used as a condition assessment tool for high voltage equipment. Application of low frequency test voltage is often preferred in the case of test objects with a large capacitance. ... -
Partial Discharge Measurements for Studying Cavities in Mass Impregnated Cables
(Master thesis, 2012)A hypothesis regarding temperature dependant discharge levels was the starting grounds for this student work. Based on calculations and conversations with experienced people in this field, there should be cavity-induced ... -
Partial Discharge Testing and Prediction Modelling at High DC Voltage
(Master thesis, 2020)Internal partial discharges can be the cause of irreversible insulation degradation in High Voltage components, which can ultimately cause breakdown. Furthermore, they could become a condition indicator of the components, ... -
Partial Discharges and Breakdown Voltage in Designs with Triple Junctions under AC Stress.
(Master thesis, 2016)Today, manufacturers of medium voltage equipment are searching for alternatives to sulfur hexafluoride (SF$_6$) as the insulating gas. The advantageous thermal and molecular properties make it suitable as an insulating ... -
Partial Discharges in Narrow Gaps on Power Electronic Converter
(Chapter, 2014)The quest for power electronic converters to operate in a subsea pressurized environment that is completely filled with appropriate dielectric liquid brings about the need to study the insulation performance of liquid in ... -
Partial Discharges in Voids at Variable Voltage Frequency and Temperature Diagnostic Testing of Stator Mainwall Insulation
(Doctoral theses at NTNU;2020:143, Doctoral thesis, 2020)The main purpose of this thesis is to improve diagnostic testing by PD detection at variable voltage frequency by developing and experimentally testing theoretical models proposed for measurement of PDs in voids in a ... -
Partial Discharges under HVDC stress
(Master thesis, 2021)Sammenkobling av strømnett på tvers av Nordsjøen er en nødvendighet for å balansere et europeisk strømnett med stor grad av fornybare energikilder. Nettene kobles sammen ved hjelp av høyspente likestrømskabler, som kan ... -
Particle Swarm Optimization Tuning of Modular Multilevel Converters in a Time-Invariant Framework
(Chapter, 2019)This work investigates the Particle Swarm Optimization (PSO) algorithm as a tool to tune the control parameters of a Modular Multilevel Converter (MMC) in a single-terminal HVdc configuration. More precisely, due to its ... -
Partielle utladningar og elektrisk trevekst i kryssbunden polyetylen og polypropylen isolasjon
(Master thesis, 2012)Kryssbunden polyetylen (PEX) er den mest brukte polymerisolasjonen i Noreg. PEX blir brukt i kablar opp til 420 kV. Auka spenningsnivå i høgspenningskablar gjev auka termiske påkjenningar og PEX kablar har ein maksimal ... -
Partielle utladninger i kryssbundet polyetylen med forurensninger
(Master thesis, 2016)Partielle utladninger (PD) er kjent for å være en av de viktigste feil- og aldringsmekanismene i PEX-kabler. Renhet i isolasjonen blir derfor ansett som en viktig parameter da forurensninger, både organiske og uorganiske, ...