In November 6, 2011, the China Electric Power Enterprise Federation organized a three Swiss scientific and technological product identification meeting in Beijing to identify the U160BLZ-550BLZ DC type, U240BLP, U300BLP, U400 (420) BLP, U530 (550BLP), U530 (550) B AC disc type suspension glass insulating products developed by our company. The appraisal committee considers that the comprehensive technical performance of the above products reaches the leading level in the world, and agrees that through technical appraisal, it can be put into production and hanged into the net. The highest level technology appraisal in China has proved three strong technical strength and reliable product quality.