A study on treeing breakdown and fractal characteristics according to method of acoustic emission detection in high polymer

In this study, in order to observe treeing deterioration and tree shape in relation to fractal dimension, acoustic emission properties due to growth of tree in Polymer was investigated by using the measuring system of AE under AC voltage. The generated tree was photographed with a camera through a microscope. The obtained photograph was digitized by using a scanner and image processed with a personal computer. After that, the tree length was measured and then the fractal dimension of tree was calculated in using a scale covering method. And growing shape of tree was quantified in using fractal characteristics. To examine relation among growing shape of tree and characteristics of fractal in tree shape (tree type and bush type) was increased with increment of applied AC, AE pulse number and mean amplitude were increased along with near breakdown rather than tree initiation. While AE pulse number and mean amplitude were promoted, fractal was slowly increased with tree growth. Fractal dimension in accord to applied voltage was slowly increased, the results show that there is a relationship between characteristics of AE and fractal dimension