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Jens Kristian Lervik

Senior Research Scientist

Jens Kristian Lervik

Senior Research Scientist

Jens Kristian Lervik
Phone: 922 06 130
Email:
Department: Electric Power Technology
Office: Trondheim

Publications and responsibilities

Publication
https://www.sintef.no/en/publications/publication/?pubid=1594528

Direct Electrical Heating (DEH) is a field-proven technology for hydrate and wax management of subsea production pipelines. DEH has been in use for nearly 20 years and is installed on approximately 30 pipelines/flowlines with length up to 43 km and on 1000 m depth, Studies indicate significant cost...

Year 2018
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1640218

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. The electrical parameters of the carbon steel pipe are critical for a DEH system...

Authors Anyuan Chen Arne Nysveen Martin Høyer-Hansen Jens Kristian Lervik
Year 2018
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1640224

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 conducting large AC current to generate heat. The heating source is...

Authors Anyuan Chen Arne Nysveen Jens Kristian Lervik Martin Høyer-Hansen
Year 2018
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1480950

A development programme founded by the Norwegian Research Council for further increase the competitiveness of the direct electrical heating (DEH) technology was initiated in 2016 and will finish at the end of 2018. The partners in this project have long experience in development, manufacturing...

Year 2017
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1480948

A development program to further increase the competitiveness of the direct electrical heating technology has been initiated. By increasing the power frequency from 50/60 to 100-200 Hz, less current is needed to develop the same heat generation in the pipe. A test program is running with the purpose...

Year 2017
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1477559

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 of the connections combined with high induced currents in the ground screens...

Authors Hans Lavoll Halvorson Sverre Hvidsten Harald Kulbotten Jens Kristian Lervik
Year 2017
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1258136

This paper considers the problems with induced currents in copper screens and aluminium laminate, consequences and improvements for a 24 kV watertight XLPE cable system. Repeated faults on a heavily loaded new cable system installed for the generators of a Norwegian hydropower generation...

Authors Børre Johansen Sivertsvoll Terje Rønningen Hallvard Faremo Jens Kristian Lervik Kåre Hønsi Rolf Wilnes Ole Kristian Jacobsen Hans Lavoll Halvorson
Year 2016
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1258261

Single-core power cables with aluminium laminate used as radial watertight need qualified solutions and instructions regarding grounding. There is often lack of information from the cable suppliers regarding the importance of proper connections and use of sufficient cross section of grounding...

Authors Jens Kristian Lervik Kristian Solheim Thinn Ketil Kvaale Gunnar Snarteland
Year 2016
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1258145

This paper considers measurements of electrical parameters for subsea power umbilicals. Electrical system parameters given in the umbilical datasheets may be inadequate for dimensioning the electrical system as they often are IEC-specifications. The parameters may be estimated by finite element...

Year 2016
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1258128

Finite element computations are presented, studying the effect of cross-talk between cable elements of different lay lengths. 3D computations with twisted conductors and screens are compared to the more traditional 2D crosssection approaches. Current flow in screens and impedances of cables are...

Year 2016
Type Academic chapter/article/Conference paper