Blar i NTNU Open på forfatter "Chiesa, Nicola"
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Analysis of Harmonic Conditions in Subsea Electrical Power Systems for Oil and Gas Installations
Garvik, Øyvind (Master thesis, 2015)Models of two separate network topologies are developed in cooperation with Statoil ASA to assure realistic construction of the networks along with relevant scenarios. The networks are implemented, simulated and thoroughly ... -
Influence of voltage harmonics on transformer no-load loss measurements and calculation of magnetization curves
Ramamurthy, Jayanth R.; Chiesa, Nicola; Hoidalen, Hans Kristian; Mork, Bruce Andrew Knut; Stenvig, Nils M.; Manty, Adam C. (Journal article; Peer reviewed, 2017)This paper investigates the voltage distortion phenomenon during no-load testing of transformers, its influence on no-load loss calculations, and a novel measurement technique that is unaffected by harmonics for obtaining ... -
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 ... -
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 ... -
Practical Experience in Using a Topological Model of a Core-Type Three-Phase Transformer - No-Load and Inrush conditions
Zirka, Sergey E; Moroz, Yuriy I; Hoidalen, Hans Kristian; Chiesa, Nicola; Lotfi, Abbas; Arturi, CM (Journal article; Peer reviewed, 2017)This paper describes an experience in transformer modeling based on open-circuit test data obtained for a wide range of terminal voltages on the low-voltage side and inrush current measurements on the high-voltage side ... -
Simplified models of three-phase, five-limb transformer for studying GIC effects
Zirka, S.E.; Moroz, Y.I.; Elovaara, J; Lahtinen, M; Walling, RA; Hoidalen, Hans Kristian; Bonmann, D; Arturi, CM; Chiesa, Nicola (Journal article; Peer reviewed, 2018)The paper describes capabilities of a topological model of three-phase, five-limb transformer to accurately represent its response when subjected to geomagnetically induced currents. The model is validated by close agreement ...