過渡的空間電荷を考慮した熱的-電子的複合絶縁破壊モデルの提案

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  • Thermal and Electronic Composite Breakdown Model in Consideration of Transient Space Charge Formation
  • カトテキ クウカン デンカ オ コウリョシタ ネツテキ デンシテキ フクゴウ

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DC and impulse electrical breakdown of polypropylene film was investigated experimentally and discussed theoretically. The breakdown characteristics of DC electric strength suggest an electronic breakdown in low-temperature region and a thermal process due to transient conduction current in high-temperature region. On the other hand, the impulse electric strengths showed almost no temperature dependence from low- to high-temperature region, suggesting the electronic breakdown process.<br>In order to explain the above breakdown characteristics, a new breakdown model is proposed by introducing an electronic breakdown criterion into thermal breakdown caused by transient conduction current. Numerical analysis was carried out taking account of the transport of both bulkgenerated and electrode-injected carriers in their transient states and the local field distortion. This thermal and electronic composite breakdown model could successfully explain the DC and impulse breakdown characteristics of polypropylene film not only in the low- but also in the hightemperature regions.

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