Space Charge Characterization of Cross-linked Polyethylene and Polypropylene for HVDC Cable Insulation

With the introduction of HVDC links into the power grid, there has been a surge of interest in the use of polymeric cables for DC transmission. XLPE, a common insulation material for HVDC cables, has been central to this discussion. However, managing the issue of space charge accumulation in XLPE cables remains an ongoing challenge. To address this challenge, the exploration of new insulating materials is essential, provided that we have a deep understanding of their properties. In this study, we aim to investigate and characterize two distinct insulating materials: traditional XLPE and PP. The primary focus of this research is to gain insights into the properties of these materials. XLPE is subjected to full characterization at various temperatures and electric fields, PP samples are subjected to initial characterization at the design temperature and electric field.. Employing the PEA-method, we conduct space charge measurements on the samples, providing valuable information on charge behavior in the insulating material. The ensuing discussion delves into the advantages and disadvantages associated with these materials, offering a comprehensive view of their performance.