<?xml version="1.0" encoding="UTF-8"?> <article key="pdf/7937" mdate="2009-02-21 00:00:00"> <author>Eka PW and T. Okazaki and Y. Murakami and N. and Hozumi and M. Nagao</author> <title>Breakdown of LDPE Film under Heavy Water Absorption</title> <pages>110 - 115</pages> <year>2009</year> <volume>3</volume> <number>2</number> <journal>International Journal of Materials and Metallurgical Engineering</journal> <ee>https://publications.waset.org/pdf/7937</ee> <url>https://publications.waset.org/vol/26</url> <publisher>World Academy of Science, Engineering and Technology</publisher> <abstract>The breakdown strength characteristic of Low Density Polyethylene films (LDPE) under DC voltage application and the effect of water absorption have been studied. Mainly, our experiment was investigated under two conditions; dry and heavy water absorption. Under DC ramp voltage, the result found that the breakdown strength under heavy water absorption has a lower value than dry condition. In order to clarify the effect, the temperature rise of film was observed using non contact thermograph until the occurrence of the electrical breakdown and the conduction current of the sample was also measured in correlation with the thermograph measurement. From the observations, it was shown that under the heavy water absorption, the hot spot in the samples appeared at lower voltage. At the same voltage the temperature of the hot spot and conduction current was higher than that under the dry condition. The measurement result has a good correlation between the existence of a critical field for conduction current and thermograph observation. In case of the heavy water absorption, the occurrence of the threshold field was earlier than the dry condition as result lead to higher of conduction current and the temperature rise appears after threshold field was significantly increased in increasing of field. The higher temperature rise was caused by the higher current conduction as the result the insulation leads to breakdown to the lower field application.</abstract> <index>Open Science Index 26, 2009</index> </article>