بررسی زمان شکست عایق و درجه حرارت شکست کابل های سالم تحت گرمایش خارجی

The insulation failure time and failure temperature of aged cables under external radiation heat flux were investigated experimentally in the present study. The effects of ageing type and ageing time on the insulation failure time and failure temperature of cables were explored. The ozone aging, the xenon arc ageing and the high and low temperature cycle ageing of cables were considered. Results show that the insulation failure time decreased with the ageing time of cables under external heating. It means that the long-term used cable had serious insulation failure hazard. Among the three types of aged cables investigated in this study, the insulation failure time of xenon arc aged cables and the high and low temperature cycle aged cables were lower than the ozone aged cables. Therefore, the insulation failure hazard of the xenon arc aged cables and the high and low temperature cycle aged cables need more attentions.