换流变压器油纸绝缘气泡动态行为与高能电弧演化机理及其防治技术综述OA

Converter transformer is a key equipment in the AC/DC transmission link and its operation stability and safety directly affects both reliability and stability level of the entire power system.In recent years,the deflagration accidents in converter transformers caused by high⁃energy arcs have shown an increasing trend,posing an major threat to the operational safety of power grids.Due to the significant impact of bubbles in oil paper insulation on its insulation performance under the influence of electric and temperature fields,and their crucial role in the formation process of high⁃energy arcs,it is of great importance to investigate the dynamic behavior of bubbles in oil paper in⁃sulation of converter transformers,the evolution mechanism of high⁃energy arcs,and their prevention and their cor⁃responding mitigation techniques.Therefore,the generation mechanism and complex dynamic behavior of oil paper insulation bubbles in converter transformers is systematically reviewed,with a focus on summarizing the formation mechanisms of thermally induced and electrically induced bubbles under different operating conditions,and the coupling mechanism between bubble cluster explosion and partial discharge evolution is introduced further.By sum⁃marizing the division of discharge stages and warning methods,the current methods for identifying high⁃energy arc precursors and their existing problems are summarized.Finally,typical discharge mitigatino technique paths are summarized from the perspectives of material modification and oil circuit structure control,providing ideas for early warning and prevention of arc precursors in converter transformers and ensuring the safe and reliable operation of AC/DC transmission systems.