Dynamism of interconnected channels in water-treed polyethylene

作者：Nakamura S^*; Kawai J; Shinagawa J; Ebinuma Y

来源：IEEE Transactions on Dielectrics and Electrical Insulation, 2000, 7(6): 832-837.

DOI：10.1109/94.891996

Loss current through non-penetrated water treed polyethylene increases with exposure time at 1000 V,500 Hz. The increment is discussed by taking the capacitance of the water treed sheet sample to be the Maxwell-Wagner type capacitor composed of two layers: the capacitance both for the non-treed region and the unfilled channel region is connected in series to the parallel combination of the capacitance and the conductance for the water-filled channel region. By assuming a non-ohmic dependence of the conductance, the fundamental and 3rd harmonic components of the loss current have been calculated numerically, based on the equivalent circuit. The numerical results give a good agreement with the observed changes of the magnitudes of fundamental and 3rd harmonic components I-1 and I-3, and their phase angles theta (1) and theta (3), respectively, for the exposure time. It has been concluded that the water-filled channel region in the water treed region grows with exposure time. It is also concluded that the conductivity of the water-filled channel region increases slightly with its growth.

• 出版日期2000-12