A new approach to calibrate the thermal conditions in space charge measurements on HVDC mini-cables
- Autori: Rizzo G.; Romano P.; Ala G.; Riva Sanseverino E.; Candela R.; Li Vigni V.
- Anno di pubblicazione: 2019
- Tipologia: Contributo in atti di convegno pubblicato in volume
- OA Link: http://hdl.handle.net/10447/406985
The PEA method is currently widespread used for space charge measurements in mini-cables in order to qualify the behavior of semicon-dielectric-semicon compound under electric and thermal stress. The main goal of this research is to quantitatively evaluate the relationship between the thermal boundary conditions applied to cables or mini-cables and the maximum local electric field due to the accumulated space charge. Hitherto, several research groups have obtained thermal gradients over the dielectric's radius heating the conductor by Joule effect due to an induced current. In this paper, a numerical approach is offered to calibrate the heat exchange boundary conditions to apply to a sample during PEA space charge measurements. This method aims to reproduce in mini-cables the same operative electric field levels reached in full size HVDC cables.