Polymeric-insulated cables, especially cross-linked polyethylene (XLPE) cables, are widely used in power system transmission and distribution networks. A cable failure can result in lengthy outages and substantial economic loss to the electrical utilities. One of the primary reasons for cable fault is insulation degradation over the service time. Various onsite electrical, thermal or mechanical stresses can accelerate the aging process of power apparatus and curtail the lifetime [1]–[3]. Additionally, different chemical processes can alter the morphological structure or chemical composition of the insulating material and degrade the dielectric properties [3], [4]. Therefore, from economic and technical points of view, regular condition monitoring and diagnostic testing have become critically important for checking the health of the insulation system before the occurrence of any complete failure. Moreover, diagnostic testing performed at appropriate intervals coupled with proper maintenance helps extend the lifespan of high voltage power equipment and components [5]–[8].

中文翻译：

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使用老化 XLPE 电缆的介电响应测量：从极低频到工频

聚合物绝缘电缆，尤其是交联聚乙烯（XLPE）电缆，广泛应用于电力系统输配电网络。电缆故障会导致长时间的停电和电力设施的重大经济损失。电缆故障的主要原因之一是在服务时间内绝缘退化。各种现场电、热或机械应力会加速电力设备的老化过程并缩短寿命[1]-[3]。此外，不同的化学过程会改变绝缘材料的形态结构或化学成分，并降低介电性能 [3]、[4]。因此，从经济和技术的角度来看，定期状态监测和诊断测试对于在发生任何完全故障之前检查绝缘系统的健康状况变得至关重要。此外，以适当的时间间隔进行的诊断测试加上适当的维护有助于延长高压电力设备和组件的使用寿命 [5]-[8]。