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Two types of resin-coated papers were investigated; kraft papers and heat-resistant kraft papers partially covered with epoxy resin; those were laminated to some thickness. They were thermally degraded at 120degC for 240 to 1320 hours, and their mechanical strength, i.e. tensile strength was measured. The tensile strength of the resin-coated kraft paper decreased with the heating time and became smaller...
As mechanical vibration usually exists in HV motors and generators, its influence on the partial discharge (PD) needs to be studied so as to improve the reliability of on-line PD monitoring method. In this report, the mechanical vibration frequency was synchronized to the power frequency and the effects of vibration phase and frequency were investigated. Because the length of the discharge gap changed...
As the shape and the size of a void in a insulation system affect considerably the progress of the deterioration of the insulation performance if partial discharges (PD's) occur in the void, it is important to estimate both of the two parameters. Conventional PD characteristics are however ineffective to estimate the shape of a void. Therefore the relationship between the shape of a cylindrical void...
An estimate method of flashover voltage in oil gap under non-uniform field is proposed. The method is deduced on the base of the n power law for V-d characteristic confirmed experimentally under uniform field. The method developed in this paper enables the V-d characteristics of oil gaps under various electric field distribution to be calculated. The comparison of calculation with experiments in corner-plane,...
This paper describes some new aspects of the reration between partial discharge characteristics and several void model structures in terms of statistical features of partial discharge pulse magnitudes against applied voltage phase. Newly proposed parameters here are the skewness and kurtosis of a φ-q pattern (applied voltage phase versus cycle mean discharge magnitude) and have been found to represent...
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