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The polarization/depolarization current (PDC) detection device was designed to measure the broad range current from μA to pA level, which was suitable for 10kV XLPE cables ageing test. To achieve wide range of measurement, the ultra-low bias current amplifier and feedback resistances which had different values were used in the I/V conversion circuits. Teflon material was taken to prevent leakage current...
As a key factor of insulation deterioration of XLPE cables, water tree can lead to the decrease of insulation property. But the dielectric loss caused by water tree is obvious at a very low frequency due to the long-time polarization of internal space charge. In this paper, focused on the dielectric response of cables, the dielectric loss spectrum of cable samples is also calculated by employing the...
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