Browsing NTNU Open by Author "Nysveen, Arne"
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Analyse av magnetfelt og tap ved enderegionen i direkte vannkjølte generatorer
Lid, Arne Moen (Master thesis, 2018)Denne masteroppgaven er en fortsettelse av prosjektoppgaven som ble utført høstsemesteret 2017. I den oppgaven ble det modellert en 2D- og 3D-modell i ANSYS Electronics basert på en av Statkraft AS sine store synkrongeneratorer. ... -
Analysis of Additional Eddy-Current Copper Losses in Large Converter-Fed Hydropower Generators
Engevik, Erlend Løklingholm; Valavi, Mostafa; Nysveen, Arne (Chapter, 2018)This paper investigates the effect of converter operation on AC copper losses in the stator and damper windings of a large hydrogenerator. Stator currents are computed using finite element simulations. The computed current ... -
Analysis of magnetic forces and vibration in a converter-fed synchronous hydrogenerator
Valavi, Mostafa; Nysveen, Arne; Nilsen, Roy; Le Besnerais, Jean; Devillers, Emile (Chapter, 2017)This paper investigates the influence of converter-fed operation on magnetic forces and radial vibration in a hydrogenerator. Flux density distribution is computed using time-stepping finite element (FE) analysis and used ... -
Analytical and FEM Calculation of Electrical Parameters of Carbon Steel Pipe in DEH Systems
Chen, Anyuan; Nysveen, Arne; Høyer-Hansen, Martin; Lervik, Jens Kristian (Chapter, 2018)In Direct Electrical Heating (DEH) systems, the pipeline of subsea oil productions conducts a large AC current to generate heat. To further improve the effectiveness of the DEH, higher operating frequency is preferable. ... -
Apparatus for loss measurements under multidirectional and dc-bias flux in electrical steel laminations
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2020)Conventional standardized power loss measurements for electric steels are performed at flux densities with a single sinusoidal and unidirectional excitation. However, the flux inside electrical steel laminations can deviate ... -
Application of AC Superconducting Windings in Large PM Synchronous Generators for Wind Power
Tiwari, Raghbendra (Master thesis, 2012)Superconductors are known for carrying very high current density without any loss of energy. This characteristic helps to achieve very high power capacity with compact size of machine. In application of superconductors, ... -
Assembly and Testing of Superconducting Field Winding
Paulsen, Morten Ellingsen (Master thesis, 2016)Superconducting rotor windings are considered for large offshore wind turbines to reduce weight, size and cost. The European project INNWIND.EU utilize various national projects in different European countries to accelerate ... -
Belastbarhet for roterende frekvensomformere for jernbanen i Norge
Klingan, Ole Johan Ekeli (Master thesis, 2014)I denne oppgaven har det blitt beregnet temperaturøkning i en enfasegenerator med dempevikling ved overlast. Generatoren er en del av en roterende frekvensomformer av typen Q48/Q49 som brukes av Jernbaneverket for å forsyne ... -
Beregning av generatorer ved modernisering av kraftverk
Lundseng, Aleksander; Vikan, Ivar (Master thesis, 2010)Bakgrunnen for dette prosjektet er det økte behovet for rehabilitering og oppgradering av vannkraftgeneratorer både i Norge og i resten av Europa. Behovet er basert på den store usikkerheten med å fastslå gjenstående levetid ... -
Breakdown strength of solid|solid interface
Hasheminezhad, Seyed Majid; Ildstad, Erling; Nysveen, Arne (Conference object; Peer reviewed, 2010) -
Charge accumulation in rod-plane air gap with covered rod
Mauseth, Frank (Doktoravhandlinger ved NTNU, 1503-8181; 2006:239, Doctoral thesis, 2007)The focus of this work has been on hybrid insulation in inhomogeneous electric fields under lightning impulse voltage stress. The principal idea behind hybrid insulation is the intentional use of surface charges to ... -
Design and Operation Investigations for large Converter-Fed Synchronous Machines in Hydropower Applications
Engevik, Erlend Løklingholm (Doctoral theses at NTNU;2019:194, Doctoral thesis, 2019)The work presented in this thesis deals with design and operation investigations for large converter-fed synchronous machines in hydropower applications. It is shown that the optimal rated frequency that gives the lowest ... -
Design Optimization of Hydropower Generators
Hestengen, Truls Even (Master thesis, 2016)For education and research purposes, a design calculation program for hydropower generators has been made. The user can change design parameters to optimize the generator. However, manual optimization is a slow and tedious ... -
Design optimization of ironless multi-stage axial-flux permanent magnet generators for offshore wind turbines
Zhang, Zhaoqiang; Nilssen, Robert; Muyeen, S.M.; Nysveen, Arne; Al-Durra, Ahmed (Journal article; Peer reviewed, 2017)Direct-driven ironless-stator machines have been reported to have low requirements on the strength of the supporting structures. This feature is attractive for offshore wind turbines, where lightweight generators are ... -
Deteksjon av rotorfeil under drift i vannkraftgeneratorer
Ebbing, Johan Henrik Holm (Master thesis, 2019)Denne masteroppgaven har undersøkt hvordan rotorfeil kan oppdages i vannkraftgeneratorer ved å måle klemmespenning og ankerstrøm. Det ble gjennomført forsøk på en 100 kVA laboratoriegenerator med 14 poler der vindinger i ... -
Effects of lifting reactance requirements on the optimal design of converter-fed synchronous hydrogenerators
Engevik, Erlend L.; Nysveen, Arne; Valavi, Mostafa; Hestengen, Truls (Chapter; Peer reviewed, 2017)The maximum allowed per unit value of the synchronous reactance of a synchronous generator is normally decided by the grid codes in order to maintain the stability of the system. For the converter-fed synchronous hydrogenerator, ... -
Electric Heating of Subsea Pipelines: Design and Testing of an Applicable Ring Core Transformer
Solheim, Kristian Thinn (Master thesis, 2013)As it becomes profitable to extract oil and gas from smaller and smaller reservoirs, jumpers (t-offs) connected to the main pipelines become necessary. This master?s thesis has investigated a simple transformer design which ... -
Electromagnetic analysis and electrical signature-based detection of rotor inter-turn faults in salient-pole synchronous machine
Valavi, Mostafa; Jørstad, Kari Gjerde; Nysveen, Arne (Journal article; Peer reviewed, 2018)In this paper, rotor inter-turn faults in salient-pole synchronous machines are investigated using finite-element analysis. The machine under study is a 22 MVA eight-pole hydropower generator with fractional-slot windings. ... -
EMC analyse ved Finnfjord smelteverk
Holsen, Martin Sagedal (Master thesis, 2011)I denne rapporten er det utført en analyse av deler av det elektriske anlegget ved Finnfjord smelteverk. Analysen har blant annet gått ut på å klarlegge årsaken til utfallet av en 110 V DC-styrekrets og et overslag på ... -
Evaluation of Magnetic Leakage Field and the Need for Screening with Respect to Induction Power Transfer (IPT) System
Venvik, Jon-Inge (Master thesis, 2014)This report considers a system for transferring electric power from shore to ships for charging of electrical driven ferries by use of induction power transfer (IPT). The IPT works by leading an alternating current through ...