エポキシ樹脂中の空間電荷分布の観測

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  • Measurement of Space Charge Distribution in Epoxy Resin
  • エポキシ ジュシチュウ ノ クウカン デンカ ブンプ ノ カンソク

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Internal space charge behavior of an insulating material has been widely discussed recently, and many experiments were carried out by using the materials for dc cables, such as XLPE, LDPE and HDPE. Since epoxy resin is used for insulation under strong electric fields in power apparatus and in electronic devices, we used the pulsed electroacoustic method to investigate the internal space charge behavior of epoxy resin samples: two types used for insulation and one type for craft use.<br>When dc electric fields were applied to the craft resins treated by immersing them into R.T. water for 8hrs and 24hrs, positive and negative charges accumulated near the anode and the cathode respectively, and the charge distributions changed with the immersion time. On the other hand, no charge was observed in the insulation type. Then we treated the samples by immersing them into 100°C water for 8hrs. When the sample was treated fbr 8hrs, hetero charge dlstribution which means the positive charge near the cathode and the negative charge near the anode, were observed. This result is consistent with a previous paper reporting that chemical analysis revealed that the secondary decomposition occurred. These results show that water and temperature influence on the internal space charge behavior of epoxy resins.

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