Blar i NTNU Open på forfatter "Nysveen, Arne"
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A Novel Health Monitoring System for Synchronous Generators using Magnetic Signatures
Ehya, Hossein (Doctoral theses at NTNU;2022:297, Doctoral thesis, 2022)The Ph.D. research work presented in this thesis deals with the health monitoring of synchronous generators utilized in hydropower plants. Although various methods are available for fault detection in synchronous generators, ... -
On-line Magnetic Flux Monitoring and Incipient Fault Detection in Hydropower Generators
Groth, Ingrid Linnea (Master thesis, 2019)Denne rapporten undersøker om kontinuerlig overvåkning av magnetfeltet i luftgapet kan bidra til å avdekke begynnende elektromagnetiske og mekaniske feil i vannkraftgeneratorer. Feiltypene som undersøkes i denne rapporten ... -
Online condition monitoring of synchronous generator using shaft signals
Hallingstad, Gaute Hagen (Master thesis, 2021)Nesten 100% av Norges elektrisitet produseres med vannkraft. Vannkraftprodusentene i Norge bruker i hovedsak generatorer av typen synkrongenerator med utpregede poler (SGUP). En sikker drift av disse generatorene er viktig ... -
Online Condition Monitoring of Synchronous Generators using Vibration Signal
Rødal, Gaute Lyng (Master thesis, 2020)Vannkraft er blant de reneste energikildene og stod for 95% og 16% av den totale energiproduksjonen i henholdsvis Norge og verden i 2018. Synkrongeneratoren med utpregende poler er den enerådende maskinen brukt for ... -
Oppgradering og optimalisering av synkrongenerator ved Lutufallet kraftverk
Sande, Nils Andreas (Master thesis, 2021)Bakgrunnen til dette prosjektet kommer av en aldrende maskinpark i norske vannkraftverk og derav et økt behov for rehabilitering og oppgraderinger av synkrongeneratorer som er installert i kraftverkene. Årsaken som utløser ... -
Optimal control of variable speed hydropower - Utilising model predictive control and virtual inertia for delivering power system services
Reigstad, Tor Inge (HydroCen brief;Nr. 3, Report, 2021) -
Optimal koblingssekvens ved oppstart av generator
Borgersen, Mathilde Jensen; Elliott, Simeon; Fossum, Jørgen Saxebøl; Kristensen, Tobias; Mortensen, Ragnhild Elvine MacQueen (Bachelor thesis, 2023)Elektrifisering og økt andel uregulerbar kraft har ført til større svingninger i strømprisen. Vannkraftverk som tidligere holdt en stabil last, kobler nå inn og ut generatorene sine i takt med prissvingningene. Konsekvensene ... -
Partial Discharges in Narrow Gaps on Power Electronic Converter
Abdelmalik, Abdelghaffar Amoka; Nysveen, Arne; Lundgaard, Lars Esben (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 ... -
Pattern Recognition of Inter-Turn Short Circuit Fault in a Synchronous Generator using Magnetic Flux
Ehya, Hossein; Nysveen, Arne (Journal article; Peer reviewed, 2021)This article provides a novel approach for discriminating the interturn short circuit (ITSC) fault in a salient pole synchronous generator (SPSG) based on the use of noninvasive sensors. A stray magnetic field is used as ... -
Pattern Recognition of Inter-Turn Short Circuit Fault in Wound Field Synchronous Generator via Stray Flux Monitoring
Ehya, Hossein; Nysveen, Arne; Nilssen, Robert (Chapter, 2020)This paper provides a novel approach to discriminate the Inter-Turn Short Circuit fault (ITSC) in salient pole synchronous generator based on the use of non-invasive sensors. A stray magnetic field is used as a non-invasive ... -
Performance Evaluation of Signal Processing Tools Used for Fault Detection of Hydro-generators Operating in Noisy Environments
Ehya, Hossein; Nysveen, Arne; Skreien, Tarjei N. (Journal article; Peer reviewed, 2021)Signal processing plays a crucial role in addressing failures in electrical machines. Experimental data are never perfect due to the intrusion of undesirable fluctuations unrelated to the investigated phenomenon, namely ... -
Photon Activity from Partial Discharges in Liquid Dielectrics: Experimental test setup and measurements
Eikeset, Jan (Master thesis, 2014)New subsea processing plants are planned to operate at large depths, down to 5000 meters. Power electronic converters are a crucial part of the plants hardware. In order for the converters to operate at such deep depths, ... -
Power losses in the three-phase three-limb transformer due to common and differential mode of dc-bias
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2021)Geomagnetically induced currents (GICs) and the converter modulation effect are the two main causes for dc magnetisation in power transformers. It is well known that a small dc-bias can saturate a large transformer and ... -
Power system for electric heating of pipelines
Novik, Frode Karstein (Master thesis, 2008)Direct electrical heating (DEH) of pipelines is a flow assurance method that has proven to be a good and reliable solution for preventing the formation of hydrates and wax in multiphase flow lines. The technology is installed ... -
Prediction of Heating Power in Magnetic Pipe Conducting Large AC Current With High Frequencies Up to 200Hz
Chen, Anyuan; Nysveen, Arne; Lervik, Jens Kristian; Høyer-Hansen, Martin (Chapter, 2018)In direct electrical heating system (DEHs), which is developed for subsea process to safeguard well stream through pipelines to topside process platform or shore, the production pipeline is also acts as an active conductor ... -
Review of Partial Discharge and Dielectric Loss Tests for Hydropower Generator Bars
Aakre, Torstein Grav; Ildstad, Erling; Hvidsten, Sverre; Nysveen, Arne (Journal article; Peer reviewed, 2017)Condition assessment of hydropower generators is important to ensure high serviceability of power stations. Many of the in-service generators are old and current load operation schemes demands more than the design load, ... -
Rotor Design of Permanent Magnet Synchronous Machine for Pumped-storage Plant
Wedum, Svein Christian (Master thesis, 2015)This master thesis is partly a deeper study of which was presented in the specialization project, fall of 2014. The main objective have been to develop and design a permanent magnet synchronous machine for hydro power plant ... -
Simulation of Small Scale Pumped Hydro Power Plant with Permanent Magnet Generator during Faults
Sklett, Lornts Mikal (Master thesis, 2015)This master thesis is a further investigation of the possibilities to utilize the permanent magnet synchronous machine technology in small scale pumped hydro power, as a continuation of the specialization project, fall ... -
Study of frequency dependent loss in magnetic steel by the Jiles-Atherton method
Tangen, Magnus Erlend (Master thesis, 2018)This thesis is a continuation of a specialization project which investigated the possibility of simulating the hysteresis and eddy current losses in carbon steel. The work comprises an investigation of how to efficiently ... -
Subsea motor drives with long subsea cable
Klyapovskiy, Sergey (Master thesis, 2014)Oil and gas are extracted from the fields by the pumps, which are driven by the electrical motors. With the tendency to increase the distance between the platform and the subsea field, where the motor is installed, the ...