ABSTRACT In order to analyze the aging of the active Ethylene-Propylene Rubber (EPR) cable, the dielectric dissipation factor (tan δ) was proposed as a nondestructive method of cable insulation condition assessment. Firstly, the EPR marine cable was investigated in this article, and the data of elongation at break retention rate (EAB%) after accelerated aging under different temperatures were used to fit by means of the optimized time-temperature shift factor. The endpoint judgment index of dielectric dissipation factor was deduced when EAB% reached to 50%. Secondly, the cable’s lifetime calculated by tan δ was compared with the EAB% in order to confirm the accuracy of the method. The results show that the lifetime of tan δ is consistent with EAB% and provides a new method for the rapid evaluation of the EPR cable’s remaining life.

中文翻译：

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乙丙橡胶电缆无损状态评估技术

摘要 为了分析活性乙丙橡胶 (EPR) 电缆的老化情况，提出了介电损耗因数 (tan δ) 作为电缆绝缘状况评估的无损方法。本文首先对EPR船用电缆进行了研究，利用优化后的时温偏移系数，利用不同温度下加速老化后的断裂伸长率保持率（EAB%）数据进行拟合。当EAB%达到50%时，推导出介质损耗因数的终点判断指标。其次，将通过tanδ计算的电缆寿命与EAB%进行比较，以确认该方法的准确性。结果表明，tanδ的寿命与EAB%一致，为EPR电缆剩余寿命的快速评估提供了一种新方法。