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DC partial discharge (PD) characteristics with PD inception voltage and PD activities are measured depending on the different electrode gap lengths and electrode configurations, and with and without solid insulators as PMMA. The charges deposited on solid insulators are measured by surface potential measurement systems. In this paper, it was concluded that the DC-PD inception and flashover voltages...
By using the Finite Element Method (FEM), calculation techniques of electric field distribution for AC, DC voltages and DC polarity reversal conditions were developed in oil-pressboard (PB) composite insulation systems. By using PB layered models under HVDC conditions, it was recognized, the electric field distributions were remarkably controlled by PB arrangement in oil. In particular, it was clarified...
It is believed that the newly developed acoustic Maxwell stress sensor presented in this paper is a useful tool for the investigation of the interfacial electric field. We have successfully demonstrated the usefulness for amorphous insulating polymers such as PET, PVDF, and PE. We are presently improving the accuracy, range, and resolution of the equipment and studying its applicability to various...
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