This paper deals with the experimental study on the insulation parameters characteristics of XLPE cable in the Course of its aging within CuSO4 electrolyte. The aging tests were performed on a section of 10kV transmission XLPE cable by means of water needle method. The insulation characteristic parameters such as insulation resistance, direct current component, capacitance, dielectric loss, mean discharge power, discharge frequency were found to be significantly dependent on the corresponding aging degree of insulation in the course of aging of XLPE cable, and different kind of aging stage has different characteristics, especially during the later period near to breakdown?? the amplitude of them has a significantly change. Therefore, according to the changing regularity of the insulation characteristic parameters within XLPE judging the aging degree of XLPE insulation will be an effective method.
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