Journal of Electrical Engineering and Automation

High-voltage DC transmission, leveraging its advantages of efficiency and stability, has become a key technology in modern power transmission. As a core component, the insulation aging of converter transformers poses a serious threat to system operational safety. A thorough analysis of transformer insulation aging reveals that thermal, electrical, mechanical stress, and environmental factors work together to cause cellulose cracking and insulating oil oxidation in the paper-insulated system. Targeted measures such as optimizing operating parameters, innovating insulating materials, and enhancing monitoring and maintenance have been proposed to effectively delay the process of insulation aging. These measures are crucial for ensuring the reliable operation of high-voltage DC transmission systems and improving power transmission efficiency.

HVDC transmission; Converter transformer; Insulation aging; Aging mechanism; Protection measures