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We evaluate the dielectric characteristic of polymeric materials for MLI (Multi Layer Insulator, a kind of thermal insulation material) for spacecraft under high energy proton irradiation using results of space charge distribution. Spacecrafts have a serious damage due to the electro-static discharge accident. The electric charges are accumulated in the polymeric materials due to radioactive rays,...
The working life of electrical machines is primary affected by the insulation system quality. Diagnostics methods help to understand the momentary state of insulation and to avoid the possible damage or electrical breakdown of machines through the repair or insulation rewinding. Partial discharges testing belongs to one of the high applicable test method of insulating materials within electrical machines...
The accelerated thermal experiments at 90degC, 110degC and 130degC are performed, using the samples that Kraft paper or thermally upgraded paper were immersed by mineral oil or nature ester. The results show that the leveling-off degree of polymerization (LODP) for ester-immersed paper insulation is higher than the one for mineral oil-immersed paper insulation, and the time of getting to the LODP...
Direct electrical heating (DEH) has shown to be a very promising method to prevent wax and hydrate formation in subsea pipelines in the North Sea. In this system the heated pipeline is an active conductor in a single-phase AC electric circuit, together with a single core high voltage extruded cable strapped (piggybacked) to the heated flowline. For new projects with flowlines exceeding 40 km, the...
This paper will review the development of thermally upgraded paper. It will discuss the various chemical modifications developed and give the current processes used today. It will review current standards activities which deal with thermally upgraded insulation systems and their impact on the recommended loading practices of transformers. It will also review the effect of thermal upgraded insulations...
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