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The assessment of the dielectric behavior of thin Polyimide films submitted to high DC stress is investigated considering different characterization methods. Materials of interest are polyimide films of 11 to 16 μm in thickness deposited by spin coating on a silicon wafer. Comparison is made with structures with a thin SiO2 layer onto the substrate. The laser intensity modulation method appears suited...
This paper deals with the characteristics of partial discharge in oil/pressboard composite insulation system, which is adopted in oil-immersed power transformer. In the insulating structure of the transformer, large oil gaps are often subdivided by pressboard barriers into small ones. Once partial discharge occurs at the point where the electric field is enhanced and progresses, the electric field...
It is crucial for reasonable transformer insulation design to understand the characteristics of discharge progress under the application of a standard lightning impulse voltage. This paper deals with the fundamental discharge characteristics of oil/pressboard (PB) composite insulation system. We obtained discharge images using a digital camera equipped with an image intensifier. In this research,...
The SF6 gas insulation system has been improved by covering the electrode with a dielectric layer. To raise the reliability of this method, the authors evaluated the influence of charge accumulation of the coated electrode on the breakdown characteristics and directly measured the charge accumulation of the coated electrode. By measuring the breakdown voltage of the coated electrode with and without...
Partial discharge (PD) monitoring system for cubicle type gas-insulated switchgear (C-GIS) filled with compressed dry air as an insulation gas was developed. The shield electrodes embedded in the solid insulator of bushings are used as PD sensors. For verification of the sensitivity of the sensors and propagation characteristics of PD pulse, artificial defects such as fixed particle on high voltage...
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