Publikasjoner og ansvarsområder
Cavities in mass-impregnated HVDC subsea cables studied by AC partial discharge measurements
Partial discharge measurements have been used for studying shrinkage voids in the insulation of mass-impregnated high voltage DC subsea power cables. Three 4.5-m long cable samples were subjected to ac partial discharge measurements at different ambient temperatures, both under isothermal conditi...
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Effects of raw natural gas on the aging of high-voltage electrical machine mainwall insulation
The total recovery of natural gas from subsea wells can be significantly increased with a compressor installed near the wellheads. The compressor is powered by a high-speed induction motor integrated in the same casing. The process gas flows through the motor and acts as a cooling medium. The insula...
Material erosion and build-up at the high voltage electrode during PD testing of subsea insulation materials using a modified Cigré II test method
Partial discharge testing of subsea insulation materials development of testing methods
Subsea installations on the sea bed at great depth require insulation materials with high reliability. Failures of such installations introduce difficult maintenance and high costs. This involves the need of reliable (insulation) materials and testing of such. The purpose of our activity is to build...