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Measurement of space charge distribution in epoxy resin
Author(s) -
Iizuka Takashi,
Yoshimoto Kazuo,
Takai Hiroshi,
Fukunaga Kaori,
Maeno Takashi
Publication year - 1999
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(19991130)129:3<9::aid-eej2>3.0.co;2-d
Subject(s) - epoxy , space charge , materials science , anode , composite material , cathode , low density polyethylene , electric charge , polyethylene , analytical chemistry (journal) , electron , electrical engineering , chemistry , electrode , physics , organic chemistry , engineering , quantum mechanics
Internal space charge behavior of insulating materials has recently attracted attention of many researchers, and a large number of experimental studies were carried out by using the materials for dc cables, such as XLPE, LDPE, and HDPE. Epoxy resins are used for insulation under strong electric fields in power apparatus and in electronic devices, and we investigated the behavior of internal space charge using the pulsed electroacoustic method. Two types of epoxy resins were studied: insulation‐grade and craft‐grade. When dc electric fields were applied to the craft resins treated by immersing them into room‐temperature water for 8 and 24 h, positive and negative charges accumulated near the anode and the cathode, respectively, and the charge distribution changed with the immersion time. On the other hand, no charge was observed in the insulation‐grade epoxy resin. Next, we treated the samples by immersing them into 100 °C water for 8 h. When the sample was treated for 8 h, hetero charge distribution, which means positive charges near the cathode and negative charges near the anode, was observed. This result is consistent with a previous paper reporting that by chemical analysis, secondary decomposition had occurred. These results show that water and temperature influence the internal space charge behavior of epoxy resins. © 1999 Scripta Technica, Electr Eng Jpn, 129(3): 9–16, 1999