Anomalous discharging current in polymethylpentene

Sotaro Asai, Yoshimichi Ohki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Discharging current which is measured after voltage application on a dielectric solid usually flows in the opposite direction to the applied field. Anomalous discharging current which flows in the same direction as the applied field is observed in polymethylpentene at temperatures higher than 100 °C. The effects of electrical stress and voltage application period on the appearance of anomalous current were examined. On the condition when the discharging current becomes anomalous, layers of hetero charges accumulated during voltage application are observed with the pulsed electroacoustic method. The accumulated charges decrease significantly after the anomalous discharging current was observed for 5 minutes. On the assumption that charge movement is ruled by the electric field formed by space charges, simulation of discharging current was carried out. The simulated discharging current agrees well with the experimental data, when it is calculated by assuming the mobility of positive charge to be μ p = 2.5 × 10 -10 cm 2/Vs and that of the negative charge to be μ n = 7 × 10 -11 cm 2/Vs.

    Original languageEnglish
    Title of host publicationConference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report
    PublisherIEEE
    Pages496-499
    Number of pages4
    Publication statusPublished - 1995
    EventProceedings of the 1995 Conference on Electrical Insulation and Dielectric Phenomena - Virginia Beach, VA, USA
    Duration: 1995 Oct 221995 Oct 25

    Other

    OtherProceedings of the 1995 Conference on Electrical Insulation and Dielectric Phenomena
    CityVirginia Beach, VA, USA
    Period95/10/2295/10/25

      Fingerprint

    ASJC Scopus subject areas

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

    Cite this

    Asai, S., & Ohki, Y. (1995). Anomalous discharging current in polymethylpentene. In Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report (pp. 496-499). IEEE.