Holistic Reliability Analysis Strategy for High-Voltage Polymeric Cable Assets based on Field-Dependent Dynamic Mechanisms

The holistic and non-destructive insulation reliability assessment of high-voltage (HV) cable assets is continuously paid more attention to supporting the resilience, safety, reliability, and availability of power systems. Clear dynamic physical mechanisms of HV cable assets will be visualized using broadband dielectric spectroscopy (BDS). Therefore, this paper aims to present some crucial observations from the high-field BDS of HV polymeric cable assets with composite structures. The influence of two types of voltage excitations (continuous and cyclic) on high-field BDS is analyzed for HV polymeric cable assets with various aging states. It can be found that the BDS memory effect and saturation effect induced by high field are prominent, with a focus on fresh and aged HV cable assets. Finally, the condition-based maintenance strategy and reliability assessment approach based on high-field dynamic mechanisms are provided as an engineering reference for HV polymeric cable assets. The relevant crucial findings can provide a theoretical basis and guidance for the reliability assessment of HV polymeric cable assets.