China Advances EHV Tech with 750kV Autotransformer

On August 10, a self-developed 750 kV single-column, high-capacity autotransformer manufactured by China Transformer Manufacturing Company successfully passed the national-level technical appraisal for new products. Experts at the appraisal meeting unanimously concluded that the product’s key technical specifications have reached an internationally leading level among similar products, marking a significant advancement for China in the design and manufacturing of extra-high-voltage (EHV) transformers.

The appraisal meeting was organized by the China Machinery Industry Federation and attended by over 60 experts and professors from prominent institutions, including the former Ministry of Industry and Information Technology (MIIT) Science and Technology Department, State Grid Corporation of China, China Southern Power Grid Company, PowerChina, China Electrical Equipment Industry Association, China Electric Power Research Institute, and Shenyang Transformer Research Institute Co., Ltd.

During the meeting, the company’s technical team delivered a comprehensive presentation covering product development summaries, testing and inspection results, novelty searches, and techno-economic analyses. Core technological innovations—such as partial discharge control, magneto-thermal co-optimization, enhanced short-circuit withstand capability, and explosion-proof design—received high praise from the expert panel. Following thorough document reviews, on-site inspections, Q&A sessions, and extensive discussions, the appraisal committee unanimously approved the product for national new-product certification.

The successful national-level appraisal of this 750 kV transformer represents strong recognition of China Transformer Manufacturing Company’s R&D capabilities and innovative achievements, underscoring its leadership in power transmission and transformation equipment manufacturing. Moving forward, the company will continue to intensify its commitment to technological innovation and contribute more “Chinese solutions” toward building a safe, efficient, and intelligent modern power grid.