Space charge behavior under AC voltage in water-treed PE observed by the PEA method

Ying Li*, Jiro Kawai, Yasumitsu Ebinuma, Yasutaka Fujiwara, Yoshimichi Ohki, Yasuhiro Tanaka, Tatsuo Takada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)


The pulsed electroacoustic method (PEA) has been applied to observe space charge formation under ac application (7 kVpk, 50, 0.1 and 0.001 Hz) in water-treed polyethylene samples in order to understand the degradation mechanism of water trees. A system with phase-resolving capability has been developed to measure the space charge distribution at any phase angle of the applied ac voltage. By comparing the observed charge distributions with theoretically predicted ones, it has been shown that the interfacial polarization due to the difference in conductivity between the treed and the regions without trees dominate the space charge behavior. It has become clear that the PEA method can be a powerful nondestructive method for evaluating water tree length.

Original languageEnglish
Pages (from-to)52-57
Number of pages6
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number1
Publication statusPublished - 1997

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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