Analysis of acoustic emission signals accompanying the process of electrical treeing of epoxy resins
[ 1 ] Instytut Elektrotechniki i Elektroniki Przemysłowej, Wydział Elektryczny, Politechnika Poznańska | [ P ] employee
2014
paper
english
EN The paper presents results of research of electrical treeing of solid dielectrics with the method of acoustic emission (AE). The study was performed on epoxy resins samples at an alternating voltage of 50 Hz. The samples were of cuboidal shape of the dimensions (25×10×4)mm. One of the cuboid sample walls of the dimensions (25×4)mm was covered with a conducting paint. Into the opposite wall a surgical needle of T-25 type was melted into. The distance between the electrodes (the needle and the wall covered with a conducting paint) was in the range 0.5-2.0mm. It was found that AE signals are generated during electrical treeing of epoxy resins. Registered AE signals were denoised with wavelet transformation method and then there were analyzed. Values of chosen parameters increased when the process begins. There are also some dominant frequencies ranges connected with the treeing.
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