The first self-owned DC converter transformer was born

TBEA Shenyang Transformer Co., Ltd. made history as the first to produce a ±500 kV DC converter transformer for the second phase of the Guizhou-to-Guangdong HVDC transmission project, which passed all required tests successfully. This achievement marks a significant milestone in China's power equipment industry, demonstrating that the company has mastered the core technologies of some of the world’s most advanced transformer systems. It also proves that TBEA is fully capable of manufacturing high-quality ±500 kV DC products independently. In December 2004, during a signing ceremony attended by the Chinese and German prime ministers, TBEA Shenyang, Siemens, and China Southern Power Grid signed an agreement to supply 34 sets of ±500 kV DC equipment for the Guiguang Second Converter Station. This contract was the first major project led by Chinese companies in joint ventures with foreign partners, highlighting the growing confidence in China’s engineering capabilities. To ensure the successful production of this national key project, TBEA established a dedicated DC department, carefully managed the design and manufacturing process, and completed independent design verification quickly, allowing the product to move smoothly into mass production. Starting from July 14, the first product underwent rigorous testing at the National Transformer Quality Testing Center, under the supervision of both users and Siemens experts. Over the past ten days, tests such as DC withstand voltage, polarity reversal, valve-side AC withstand voltage, and induced voltage were conducted, and the results showed excellent performance, meeting high technical standards. Currently, TBEA is accelerating production of 1000 kV AC UHV transformers for the State Grid test base and has won the bid for 750 kV main transformers in the northwest region. Additionally, the company has made notable progress in developing ±800 kV DC products, and now possesses full capability to independently produce converter transformers and smoothing reactors for HVDC projects up to ±800 kV. This continued innovation underscores TBEA’s leading role in China’s power transformation industry.

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