Influence of zinc oxide nanoparticles on flashover voltage of unsaturated polyester resin-based composites for electrical insulators

• Date: 2026
• Main Authors: Rihan, M., Ghazzaly, A., Fahmy, A. H., Ebnalwaled, A. A., Nasrat, L. S.
• Format: Article
• Language: English
• Published: National Technical University "Kharkiv Polytechnic Institute" and Аnatolii Pidhornyi Institute of Power Machines and Systems of NAS of Ukraine 2026
• Subjects: unsaturated polyester resin; zinc oxide; filler; nanocomposites; flashover voltage; curve fitting technique
• Online Access: https://eie.khpi.edu.ua/article/view/352704
• Journal Title: Electrical Engineering & Electromechanics

Introduction. Polyester-based composites are increasingly used in electrical applications for their insulation, mechanical, and thermal properties. Nanofillers have shown promise in enhancing the properties of polymer-based composites. Goal. This study aims to improve the flashover voltage of unsaturated polyester resin (UPR)-based composites by incorporating zinc oxide (ZnO) nanoparticles. Methodology. UPR/ZnO nanocomposites were prepared with various ZnO nanofiller ratios (0 %, 1 %, 3 %, 5 %, and 7 % by weight) with different sample lengths (0.5, 1.5, 2, and 2.5 cm). The flashover voltage was measured for the pure UPR sample and each composition of the studied filler ratios at various sample lengths. X-ray diffraction analysis was performed. A curve-fitting method was applied to estimate the flashover voltage of UPR/ZnO nanocomposites containing intermediate filler ratios between those experimentally tested. Results. Incorporation of ZnO nanofillers significantly enhanced the flashover voltage of polyester-based nanocomposites. The pure UPR sample exhibited the lowest flashover voltage, whereas the composite with 7 wt.% ZnO nanofiller demonstrated the highest. Notably, increasing the sample length further improved flashover voltage. Scientific novelty. This study examines the influence of ZnO nanoparticles on the flashover voltage of UPR-based composites. Practical value. The obtained findings can contribute to the development of polyester-based nanocomposite insulators with enhanced flashover voltage. References 26, tables 3, figures 6.