The first 500 kV DC convert transformer, TBEA Shenyang Transformer Group Co.,Ltd undertook and produced for the national key project---- the second DC transmission project convert station from Guizhou to Guangdong, achieved a qualified pilot on July 23, 2006. It is the first time that a Chinese enterprise independently designed and manufactured the 500 kV DC convert transformer, and its successful test marks that TBEA Shenyang Transformer Group Co., Ltd is fully capable of producing its own high-quality products of 500 kV DC, and become the firs domestic enterprise to achieve a independent R & D 500 kV DC products.