This book presents original, peer-reviewed research papers from the 2025 5th International Symposium on Insulation and Discharge Computation for Power Equipment (IDCOMPU2025), held in Harbin, China. The topics covered include, but are not limited to, insulation technologies, discharge computation methods, electric power equipment, and electrical materials. These papers showcase the latest advancements in the field of insulation and discharge analysis for power equipment, making the book a valuable resource for researchers, engineers, and university students engaged in electrical engineering and related disciplines.