Browsing Institutt for elkraftteknikk by Subject "Energi og miljø, Elektriske anlegg"
Now showing items 1-20 of 32
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Application of Optical Current Transformers in Digital Substations
(Master thesis, 2018)In this master's thesis optical current transformers are studied in order to evaluate whether such sensors are suitable for application in digital transmission substations. The analysis includes a discussion of benefits ... -
Bruk av smarte målere til feillokalisering i høyspente distribusjonsnett
(Master thesis, 2017)Tidligere har manuelle feillokaliseringsmetoder vært utbredt, der mye menneskelig og langvarende aktivitet har vært nødvendig for å både detektere og lokalisere feil. Varsling om feilsituasjoner har vært gjort ved signal ... -
Characterization of Insulation Materials for HVDC Subsea Connectors - Evaluation of Measurement Methods for Surface Conductivity
(Master thesis, 2015)The focus of this work has been on characterization methods for the surface conductivity of insulation materials in HVDC subsea connectors. Having a proper characterization is important when selecting the most suited design ... -
Condition Assessment of Medium Voltage Cable Accessories - PD Measurements at Variable Frequencies
(Master thesis, 2016)Diagnostic PD testing of medium voltage cables can be performed at very low frequencies (VLF, 0.1 Hz), to reduce capacitive currents. At 0.1 Hz the field distribution in the field grading materials is likely different from ... -
Condition Assessment of Medium Voltage Cable Joints - Dielectric Spectroscopy of field grading materials
(Master thesis, 2015)This thesis examines the electrical properties of a commonly used stress control tube for medium voltage heat-shrink joints using non-destructive methods in laboratory. The electrical properties of the tube were determined ... -
Condition Assessment of Service Aged Medium Voltage Cable Joints During Load Cycling
(Master thesis, 2018)In order to be able to take maximum advantage of the remaining lifetime of the components in the distribution network, utilities need to know the condition of the equipment as accurately as possible. When partial discharges ... -
Design, Optimization and Analysis of a Single Rotor Magnetic Gear Electric Machine
(Master thesis, 2017)Magnetic gears have recently become serious contenders for mechanical gears in low speed applications that require high torque. A magnetic gear features benefits such as inherent overload protection and low maintenance, ... -
Earth fault protection in isolated and compensated power distribution systems
(Master thesis, 2016)This report is the result of the work with the master thesis written during the spring of 2016 at NTNU, where the main ambition has been to find a relay setting for earth fault protection that can work both in isolated and ... -
Elektrisk trevekst i isolasjonsmaterialer for høyspente AC konnektorer - Effekt av syntetisk ester og hydrostatisk trykk
(Master thesis, 2015)En subseakonnektor er et komplekst isolasjonssystem som brukes til å koble sammen kabler, noder osv. på havbunnen. Silikon er et polymerisk materiale som er egnet bl.a. som membran til å svipe av vann fra kontakten ved ... -
Experimental Determination of Losses in MgB2 Superconductors for Wind Turbine Applications
(Master thesis, 2017)Superconducting generator field windings are suggested for the next generation of wind turbines. The foreseen wind turbines with power ratings greater than 10 MW give raise to technical challenges. Superconducting field ... -
Fault Ride Through Capability Analysis of Small-Scale Hydro Power Plants
(Master thesis, 2016)This master thesis has looked upon the fault ride through capability assessment for small-scale hydro power plants in the distribution grid. In this report, the shape of the voltage dip has been studied, and the voltage ... -
Geomagnetic Induced Current Effects on Power Transformers
(Master thesis, 2016)Solar storms are inevitable and have a number of negative effects on technological systems, the power grid being no exception. High geoelectric field values due to severe geomagnetic storms cause geomagnetic induced currents ... -
Integration of Photovoltaic into grid using Modular Multilevel Converter
(Master thesis, 2017)The integration of solar energy into the power grid is a challenging task. Many configurations and control methods have been studied. In this thesis, the Modular Multilevel Converter is adopted to integrated Photovoltaic ... -
Intelligent styring av LED veibelysning
(Master thesis, 2015)Innen vei- og gatebelysning kan det i Norge gjøres store økonomiske og energiøkonomiske innsparinger dersom LED og intelligente styresystemer tas i bruk. Til tross for dette, virker terskelen for investeringer å være høy ... -
Karakterisering av silikongummi for HVDC subsea-konnektorer
(Master thesis, 2016)En subseakonnektor brukes til å koble sjøkabler sammen med elektrisk utstyr på havbunnen. En viktig komponent i subseakonnektoren er membranen som skal svipe av vann fra kontakten ved tilkobling til konnektoren. Et egnet ... -
Konsekvenser av overharmoniske strømmer og spenninger fra elektronisk utstyr i lavspenningsanlegg
(Master thesis, 2015)Dagens elektriske anlegg inneholder en stor andel forbrukerutstyr og komponenter som er basert på elektronikk. Elektronikken genererer overharmoniske strømmer og spenninger grunnet ulineære strømkarakterstikker, som blant ... -
Modelling, Simulation, and On-line Detection of Rotor Fault in Hydrogenerators
(Master thesis, 2017)Hydropower generator is a critical component in hydropower stations and is therefore subject to a preventive maintenance strategy to avoid failures of the generator's components. Fault detection techniques can be used to ... -
Ombygging av 230 V IT-installasjoner til 230/400 V TN-installasjoner
(Master thesis, 2017)På grunn av forventede endringer i bruksmønster og behov er det fra norske myndigheters side et ønske om å tilpasse seg den europeiske modellen for utforming av lavspenningsnett. I Norge i dag er størstedelen av ... -
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 ... -
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 ...