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In this paper, based on the PEA equipment in our laboratory, the attenuation and dispersion of charge acoustic signals in the flat XLPE samples with the different thicknesses and under the different nanosecond pulse widths were studied through experiments and simulations. Then, through the extraction and extension of attenuation and dispersion coefficients of acoustic wave under different pulse frequencies,...
Multi-layer insulations are commonly used in HVDC applications, giving rise to physical and chemical interfaces in the insulation systems. Space charges at the interface between insulators play crucial roles on the electric field distribution of such insulation systems. The issue arises in the design of high voltage direct current (HVDC) insulations. How to understand the behaviors, mechanisms and...
In the insulation of converter transformers for HVDC transmission, the effect of space charges on field distortion is an important factor. Multilayers of oil immersed papers and oil gaps that compose paper/paper and paper/oil interfaces are used in converter transformers. The interface charge behaviors may not follow traditional Maxwell-WagnarSillars polarization law. In this report, the measurement...
As the temperature difference exists between the inner and outer conductors of high voltage DC cables in practice, it is important to study space charge behavior under temperature gradient. However, due to the effect of temperature on the acoustic propagation, it is necessary to study the waveform recovery method in pulsed electroacoustic (PEA) measurement. In our previous study, only the effects...
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