The world's first industrial-grade 550kV rectifier transformer, developed by Jiangxi Transformer Science & Technology Co., Ltd., passed all type and routine tests in a single session. The unit is equipped with Qixing 550kV dry-type condenser bushings, demonstrating insulation reliability, partial discharge control and mechanical stability under ultra-high voltage conditions. This milestone validates domestically engineered high-end bushings for critical industrial power equipment.