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A description of aging stability for self-contained oil- filled cable dielectrics is given. The power factor of oil-filled cable dielectrics over an extended period and the dielectric properties of low-pressure self-contained oil-filled cable withdrawn from service were studied in the laboratory. From the test results, the authors suggest that the increase in the power factor of oil-filled cable after long use is mostly attributable to the deterioration of the mineral insulating oil. This conclusion clearly differs from the results reported in  and .