Water tree characteristics in low-density polyethylene under power-frequency voltages with high-frequency components

Hidenori Suzuki, Yoshimichi Ohki, Yoshinobu Nakamichi, Kohji Ajiki

Research output: Contribution to journalConference article


For magnetic levitation railway systems using linear synchronous motors, pulse-width-modulation inverters and polymer insulated cables are used for driving cars and feeding electricity, respectively. This implies that ac voltages with many harmonics induced by inverters are applied to cables. However, little is known about dielectric properties of polymers under such ac voltages. Therefore, water-tree characteristics have been investigated for low-density polyethylene using power-frequency ac voltages with high-frequency components. It was found that water tree grows very fast under high-frequency voltage. However, in the case of the superposed voltage, water tree does not grow so fast if the high-frequency component is not large. It is considered that the zero-crossing of the applied voltage plays an important role for the tree growth.

Original languageEnglish
Pages (from-to)742-745
Number of pages4
JournalConference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report
Publication statusPublished - 1996 Dec 1
EventProceedings of the 1996 Annual Conference on Electrical Insulation and Dielectric Phenomena. Part 2 (of 2) - Millbrae, CA, USA
Duration: 1996 Oct 201996 Oct 23


ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Industrial and Manufacturing Engineering
  • Building and Construction

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