Blar i NTNU Open på forfatter "Høidalen, Hans Kristian"
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Implementering av relévern i ATPDraw
Stadheim, Torstein (Master thesis, 2012)Rapporten omhandlar utviklinga av relévernmodellar for bruk i ATPDraw. ATPDraw er eit simuleringsprogram for elektriske kretsar, og inneheld per i dag ikkje modellar av relévern.Fyrste del av rapporten tek for seg ... -
Investigating Contributing Factors to Rogowski Coil Accuracy: COMSOL Simulation and Laboratory Testing
Hagejordet, Thomas Wagensveld Van (Master thesis, 2023)Denne studien undersøker ytelsen og nøyaktigheten til forskjellige konfigurasjoner av Rogowski- spoler gjennom laboratorietester og COMSOL-simuleringer, med hovedfokus på posisjonsfeil, vinkelforskyvninger, effekten av ... -
Investigating Transient Overvoltages due to Multiple Reignitions when Switching Small Inductive Loads
Hansen, Erik (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 of Dielectric Response Measurement as a Tool to Detect Copper Sulphide on Insulation Paper
Birkelund, Bendik Jørgensen (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 ... -
Jordfeil i Spolejordet Regionalnett.
Særen, Morten Paulsen (Master thesis, 2019)En forenklet modell av Nordnettet er etablert i programvaren ATP Draw. Modellen er designet for å analysere jordfeilstrømmer, spenning og resonanskurve. Den er bygd opp slik at man selv kan stille inn spoleinnstillingene ... -
Jordfeildeteksjon i spolejorda distribusjonsnett: Mulige årsaker til utilsiktet utfall av linjer i Fillan transformatorstasjon
Guldal, Magnus (Master thesis, 2007)I denne oppgaven er det sett på nullpunktspenninger i det spolejordete Fillan-nettet på Hitra. Grunner til variasjoner i nullpunktspenningen er undersøkt, spesielt med hensyn å avdekke hvorfor man i noen tilfeller får ... -
Localisation of ground faults in power systems with distributed production
Mbuzi, John (Master thesis, 2008)Summary Distribution power systems experience a lot of faults due to high network utilisation and reduced investment in the infrastructure. Single phase faults are the most common. The standard distribution systems are ... -
Maximum step out of AC cables to offshore installations
Vatn, Per Tore (Master thesis, 2018)The task of supplying an offshore installation with power is one that can be solved in several different ways. This thesis suggests a compensated AC subsea cable as the power from shore solution. At a length of 200km, the ... -
Medium Frequency High Power Transformers for All-DC Wind Parks
Agheb, Edris (Doctoral theses at NTNU;2017:104, Doctoral thesis, 2017)There is an increasing interest during recent decades for high power converters due to their capabilities in addressing different challenges in various applications such as renewable energies and smart grids and also at ... -
Modellering av strømtransformatorer og verifikasjon i høystrømlab
Brun, Sindre Heimly (Master thesis, 2012)Rapporten omhandler magnetisk metning i beskyttende strømtransformatorer. Forståelsen av metning er viktig for å øke driftssikkerheten i kraftsystemet. En Arteche CTI-420 strømtransformator ble stilt til disposisjon under ... -
Modification of empirical core loss calculation methods including flux distribution
Agheb, Edris; Høidalen, Hans Kristian (Journal article, 2013)Using medium-frequency high-power transformers leads to significant decrease in size and volume of high-power converters in different applications such as offshore wind farms and electric traction. However, increasing the ... -
Nettanalyse i forbindelse med transformatorhavari i spolejordet nett
Eilertsen, Anja Kjærnes; Govasmark, Dorte Ryste; Smisethjell, Ingrid; Aunemo, Johanne; Gussiås, Mari Støen (Bachelor thesis, 2021)Beskyttelse av sentrale komponenter i kraftsystemet er viktig for anleggseiere for å ivareta person- og forsyningssikkerhet, i tillegg til økonomiske hensyn. Når en transformator havarerer er det nyttig å undersøke ... -
Off-core magnetic flux paths in power transformers. Modeling and applications
Abbas, Lotfi (Doctoral theses at NTNU;2020:140, Doctoral thesis, 2020)Zero sequence (ZS) characteristics of transformers are of great importance in some circumstances including unbalanced and DC biased operations. Any unbalanced condition in the voltage supplying a transformer or in the load ... -
Overslagskarakteristikk for Isolatorer i Distribusjonsnett
Solskinnsbakk, Frode (Master thesis, 2019) -
Piloted Protection Solutions For Distribution Networks With Integrated Distributed Energy Resources
Kazmi, Syed Hamza Hasan (Master thesis, 2017)The wide scale integration of distributed energy resources (DERs) in the distribution networks (LV/MV) over the last few decades has resulted in new challenges for the protection system. This thesis work explores the ... -
Power System Relay Modeling in Electromagnetic Transient Program
Wold, Kine (Master thesis, 2014)The simulation program Alternative Transient Program is widely used in time-domain analysis of electrical systems. The program itself and its graphical pre-processor ATPDraw is under constant development. Implementation ... -
Power Transformer Modeling for Inrush Current Calculation
Chiesa, Nicola (Doctoral Theses at NTNU, 1503-8181; 2010:64, Doctoral thesis, 2010)In this thesis a general purpose transformer model for low and medium frequency transient studies is developed and verified. The inrush current phenomena during no-load energization of power transformer is analyzed with ... -
Proposal and Evaluation of a New Short Circuit Protection Algorithm for Active Meshed Distribution Grids
Wirgenes, Karl Fredrik Anker (Master thesis, 2023)Masket drift av det høyspente distribusjonsnettet (DN) er en måte å motvirke fremtidig spenning og overbelastning-problematikk i DN grunnet økning i last og distribuert produksjon (DG). På grunn av økonomiske og algoritmiske ... -
Protection of capacitor banks: Nuisance tripping of overcurrent relays; causes and possible remedies
Gebs, Christopher (Master thesis, 2013)The origin of this master thesis is Statnett having problems with nuisance tripping of capacitor banks. Their own measurements are said to indicate that harmonics are confusing the overcurrent relays. Disconnecting a large ... -
PSCAD Simulation of Distance Protection Performance in a Grid with Inverter Interfaced Generation
Kavli, Nicolay Anker (Master thesis, 2020)I denne oppgaven har ytelsen til distansevern i et kraftnett med vekselretter-tilkobede produksjonskilder blitt studert gjennom simuleringer i PSCAD. Statnett forventer at problemer for distansevern vil oppstå i nærheten ...