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Jens Kristian Lervik

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Jens Kristian Lervik

Seniorforsker

Jens Kristian Lervik
Telefon: 922 06 130
Mobil: 922 06 130
Avdeling: Elkraftteknologi
Kontorsted: Trondheim

Publikasjoner og ansvarsområder

Publikasjoner

Publikasjon

High Frequency Heating of Subsea Oil Production Pipelines

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1369191

Direct Electrical Heating (DEH) of offshore pipelines is an established cost-efficient and environmental friendly method for flow assurance in offshore oil production compared to traditional methods such as chemical injection. The first DEH system was installed in year 2000 in the North Sea, and is ...

Forfattere Lervik Jens Kristian Iversen Øyvind Solheim Kristian Thinn
År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

Direct Electrical Heating Closer to Subsea Structures

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1369194

Direct electrical heating is a qualified method for flow assurance in coated oil and gas flowlines. A concern is ac corrosion on connected templates caused by stray currents from the DEH system. This has prevented DEH from being installed on flowlines with in-line templates and restricted heating of...

År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

Watertight Cable Designs in Hydropower Generation Plants

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+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 station res...

Forfattere Sivertsvoll Børre Johansen Rønningen Terje Faremo Hallvard Lervik Jens Kristian Hønsi Kåre Wilnes Rolf Jacobsen Ole Kristian Halvorson Hans Lavoll
År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

Evaluation of cross-talk in power cables by use of 3D finite element computations

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+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 obta...

År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

System Impedance Measurements of Power Cable Umbilicals

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+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 anal...

År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

XLPE Cables with Aluminium Laminated Sheath

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+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 wires....

Forfattere Lervik Jens Kristian Solheim Kristian Thinn Kvaale Ketil Snarteland Gunnar
År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

Low Power DEH System for Flow Assurance

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1260059

Hydrate management by direct electric heating (DEH) has been in use for 15 years. The system has been continuously improved and adapted to the specific requirements during the development of new fields. Presently the system is designed for around 5 years of usage during the lifetime of the field. Du...

Forfattere Lervik Jens Kristian Iversen Øyvind Nysveen Arne
År 2015
Type Konferanseartikkel/Bokkapittel
Publikasjon

Design of DEH Systems for Hydrate Management

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1142864

Hydrate management by direct electrical heating (DEH) has proven to be reliable, easy to operate and cost effective. DEH requires limited modifications of the pipelines, i.e. electrical grounded connections at both pipe ends, a cable piggybacked to the pipeline and additional anodes at both pipe end...

År 2014
Type Konferanseartikkel/Bokkapittel
Publikasjon

Flow Assurance by Electrical Heating of Long Pipelines

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1038612

...by electrical heating. Presently 42 km is the longest pipeline supplied with DEH (Direct Electrical Heating). The main limiting factor is the power cables operational voltage, which limits the heated length to approximately 60 km depending on heating requirements. Increasing the voltage level is the...

År 2013
Type Konferanseartikkel/Bokkapittel
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