| Title |
A Study on φ-AE Distribution Patterns Characteristics due to Treeing Deterioration |
| Keywords |
음향방출 ; 왜도 ; 첨쇄도 Acoustic Emission ; Skewness ; Kurtosis |
| Abstract |
In this paper, characteristics of Acoustic Emission in Low Density Polyethylene were studied from tree initiation to breakdown under long-term inhomogeneous alternative electrical field. The voltage levels used were 9, 11 and 14[kV]. Especially, a newly developed automatic measuring system was used to measure time variations of AE average amplitude, AE pulse number, AE pulse distribution patterns due to polarities. The patterns wer specially the variated patterns, when tree propagated. Also, parameters for dielectric breakdown prediction, which were suggested by Okamoto, were calculated. The result was analysed by tree shapes and partial discharge activities in tree due to tree initiation and propagation. |