基于硬度保留率的船用电缆剩余寿命快速评估

为了更好地对电缆绝缘状态进行分析,提出采用硬度保留率这一可以快速检测特征量作为电缆剩余寿命的无损评估方法。以船用乙丙橡胶电缆为研究对象,首先利用优化的时间-温度平移因子拟合不同加速老化温度下试样硬度保留率数据,并由Arrhenius方程外推出不同终点水平与运行温度下电缆剩余寿命。其次,将硬度保留率与由断裂伸长率保留率计算的寿命值进行比较以验证该方法的准确性。结果表明,硬度保留率与断裂伸长率保留率具有高度的一致性,为电缆剩余寿命的快速评估提供了一种新的方法。

Rapid Assessment of Marine Cable Remaining Life Based on Retention Rate of Hardness

In order to analyze the cable insulation state,a nondestructive assessment method is proposed by using the retention rate of hardness as the rapid detection characteristic parameter of the cable remaining life. In this paper,the ethylene propylene rubber( EPR)marine cable is investigated. Firstly,the data of the retention rate of hardness after accelerated aging under different temperatures are used to fit,by means of the optimized time-temperature shift factor. And the cable remaining life is calculated by extrapolation of the Arrhenius equation under different end levels and temperatures. Secondly,the lifetime calculated by the retention rate of hardness is compared with that by the retention rate of elongation at break( EAB %)in order to confirm the accuracy of the method. The results show that the retention rate of hardness is consistent with EAB% and provides a new way for rapid evaluation of cable’s remaining life.