Abstract
Investigations into the effect of moisture on the degradation of oil-impregnated-paper insulated low voltage cables has shown that moisture ingress plays a key role in cable failure, and that the ionic content of the moisture is critical. Here moisture ingress into oil-impregnated-paper insulated cable is studied in the laboratory. Experiments have been performed in which cable samples have been exposed to moisture for varying periods, allowing the progress of moisture diffusion within the insulation to be studied. Karl-Fischer titration and observation of dye movement have been used to measure moisture transport. Moisture within a ?wet cable? is shown to be non-uniformly distributed within a sector-shaped core, and dependent on the temperature of the cable. Measurements of insulation conductivity are presented illustrating the resulting macroscopic changes to insulation properties for comparison. An increased rate of penetration of moisture into the cable core results at elevated temperatures, whilst saturation levels are reduced.
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