Hans Helmer Sæternes
Research Scientist
Hans Helmer Sæternes
Research Scientist
Publications and responsibilities
Compatibility of liquid and solid insulation materials for high voltage subsea connectors
The main objective of this study is to identify reliable insulation materials and systems for novel AC and DC subsea power connectors for oil and gas exploitation. A combined solid-liquid insulation system might be radically altered if the materials are not compatible. Different combinations of...
Hvordan kan kapasiteten i en strømkabel bli utnyttet maksimalt?
Self-healing high voltage electrical insulation materials
Electrical treeing can be the precursor to catastrophic failure for electrical insulation materials and hence significantly shorten their service lifetime. Considering that damage inside the composites (thermoset insulation materials containing fillers) is difficult to detect and particularly to...
Water Treeing in XLPE Insulation at a Combined DC and High Frequency AC Stress
For many subsea HVDC cable systems, the DC current is transmitted through the HV cable in a voltage source converter (VSC) - HVDC scheme. Modulated upon the DC voltage are harmonics, which originate from the switching feature of the VSC stations. The main purpose of this paper is to examine the...
Influence of DC Stress Superimposed with High Frequency AC on Water Tree Growth in XLPE Insulation
Power electronics used for HVDC converters will stress cable insulation with a DC voltage with superimposed transients. The effect these transients have on the performance of the polymeric cable insulation is yet not clear. The main purpose of this work has been to investigate the effect of...
The effect of hydrostatic pressure on electrical treeing in silicone cable joints
The purpose of this work was to study the effect of hydrostatic pressure on the initiation and growth of electrical trees in a silicone insulation material for electrical apparatus. In this study a commercial available light transparent silicone material was subjected to a hydrostatic pressure in...