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説明
There have been some previous studies on the electrical breakdown of liquid dielectrics under high frequency fields, and it is generally recognized that the mechanism of breakdown must be a thermal process caused by dielectric heating.1,2 The thermal breakdown phenomenon is described by the following thermal conduction equation cρ ∂θ/∂t = div(K grad θ) + σE2 (1) where θ, cρ, k, and σ represent the temperature, specific heat per unit volume, thermal conductivity and equivalent electrical conductivity of the dielectric, and E is the applied field. Mainly because of complexity of the temperature dependence of electrical conductivity, solutions of this equation cannot, in general, be obtained. However, silicone liquids exhibit a temperature dependence of conductivity which is smaller and simpler than that of many other liquids, and for such materials, it is possible to obtain an approximate solution to Eq. (1).
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- IEEE Transactions on Electrical Insulation
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IEEE Transactions on Electrical Insulation EI-8 128-133, 1971-11-01
Institute of Electrical and Electronics Engineers (IEEE)