Browsing SINTEF Open by Author "Hvidsten, Sverre"
Now showing items 1-15 of 15
-
A stochastic model for contact surfaces at polymer interfaces subjected to an electrical field
Kantar, Emre; Hvidsten, Sverre; Mauseth, Frank; Ildstad, Erling (Journal article; Peer reviewed, 2018)Morphology of the contact area between solid insulation materials ultimately determines the short- and long-term electrical properties of the complete insulation system. The main purpose of this paper is to propose a ... -
Comparison of Offline VLF PD Measurements and Online PD Measurements on a 50-Year-Old Hydrogenerator Stator in Norway
Eberg, Espen; Aakre, Torstein Grav; Berg, Gunnar; Hvidsten, Sverre (Chapter; Peer reviewed, 2018)Stator winding insulation is the part of the hydrogenerator experiencing the highest number and the most damaging failures. Partial discharge (PD) measurement, both offline and online, are commonly used for condition ... -
Condition Assessment of Hydrogenerator Stator Bar Insulation Using Partial Discharge Measurements
Aakre, Torstein Grav; Ildstad, Erling; Hvidsten, Sverre (Chapter; Peer reviewed, 2018)This paper presents results from laboratory measurements of partial discharge (PD) activity in 50 cm long samples cut from the mainwall section of old hydrogenerator stator bars. All stator bars were manufactured in 1976 ... -
A Deterministic Breakdown Model for Dielectric Interfaces Subjected to Tangential Electric Field
Kantar, Emre; Hvidsten, Sverre (Peer reviewed; Journal article, 2021)The contact area between solid insulations, namely solid-solid interfaces, affect the dielectric characteristics of an entire insulation system. With the theoretical and experimental studies covered in this paper, we intend ... -
Development of a web-based user-friendly cable ampacity calculation tool
Eberg, Espen; Espeland, Kåre; Hellesø, Svein Magne; Hvidsten, Sverre; Solheim, Kristian Thinn (Journal article; Peer reviewed, 2019) -
Effect of Elastic Modulus on the Tangential AC Breakdown Strength of Polymer Interfaces
Kantar, Emre; Ildstad, Erling; Hvidsten, Sverre (Journal article; Peer reviewed, 2019)Solid-solid interfaces between insulating materials dictate the long-term electrical properties of the complete insulation system. This paper presents theoretical and experimental investigations aiming to address the impact ... -
Effect of Material Elasticity on the Longitudinal AC Breakdown Strength of Solid-Solid Interfaces
Kantar, Emre; Ildstad, Erling; Hvidsten, Sverre (Journal article; Peer reviewed, 2019) -
Effect of Radial Pressure and Lubricant Types on Partial Discharge Inception in a Slip/On Medium Voltage XLPE Cable Termination
Kantar, Emre; Hvidsten, Sverre; Aakervik, Jørund (Chapter; Peer reviewed, 2023)The most critical section in a cable termination or a subsea connector is the interface between the cable surface and the inner surface of the termination body, including the semiconductive geometric field grading. Partial ... -
Effects of Frequency and Temperature on Partial Discharge Characterization of Stator Windings
Kantar, Emre; Eberg, Espen; Hvidsten, Sverre (Conference on Electrical Insulation and Dielectric Phenomena. Annual Report;2020, Chapter; Peer reviewed, 2021) -
Epoxy-Based Nanocomposites for High-Voltage Insulation: A Review
Adnan, Mohammed Mostafa; Tveten, Erlend Grytli; Glaum, Julia; Ese, Marit-Helen Glomm; Hvidsten, Sverre; Glomm, Wilhelm; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2018)Epoxy nanocomposites, with inorganic oxide nanoparticles as filler, can exhibit novel property combinations, such as enhanced mechanical strength, higher thermal conductivity, increased dielectric breakdown strength, and ... -
Experiences With cable faults located at metallic screen connections
Halvorson, Hans Lavoll; Hvidsten, Sverre; Kulbotten, Harald; Lervik, Jens Kristian (CIRED Conference Proceedings;2017, Chapter; Peer reviewed, 2017)Overheating of metallic ground screen connections at accessories of single core cables are the root cause of severe insulation failures in the distribution network. The overheating is due to a high transition resistance ... -
Formation of micro-cracks at the surface of a high voltage cable screen induced by aluminum corrosion
Lesaint, Cedric Michel; Liland, Knut Brede; Mermigkas, Athanasios; Klusmeier, Katharina Kuhlefelt; Kantar, Emre; Hvidsten, Sverre; Hestad, Øystein Leif Gurandsrud (Chapter; Peer reviewed, 2023)The main purpose of this study is to investigate the adhesion between corroded aluminium conductor strands and the semi-conductive cable screen. In this paper it is proposed that increased adhesion is one of the pre-requisites ... -
Full-scale case study of a road crossing thermal bottleneck in buried MV cable installation
Eberg, Espen; Espeland, Kåre; Hellesø, Svein Magne; Hvidsten, Sverre (CIRED Conference Proceedings;2017, Chapter; Peer reviewed, 2017)Infrastructures such as road crossings, are often limiting the ampacity of a cable link due to poor thermal properties. In order to fully utilize the true loading capacity of the cable, thermal modelling with correct input ... -
STEM-EDS of Inception Sites of Vented Trees in a HV XLPE Subsea Cable
Hårberg, Sofie Brandtzæg; Nylund, Inger-Emma; Einarsrud, Mari-Ann; Vullum, Per Erik; Lesaint, Cedric Michel; Hvidsten, Sverre (Chapter, 2023)High voltage XLPE cable cores have been subjected to wet ageing following the recommendations in CIGRE TB 722. The electrical ageing was performed at 500 Hz and 10 kV/mm. Vented water trees were detected initiating and ... -
The Structure, Morphology, and Complex Permittivity of Epoxy Nanodielectrics with in Situ Synthesized Surface-Functionalized SiO2
Adnan, Mohammed Mostafa; Nylund, Inger-Emma; Jaworski, Aleksander; Hvidsten, Sverre; Ese, Marit-Helen Glomm; Glaum, Julia; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)