In the early morning, the mist of the Xiangjiang River had not dissipated, and a huge object was lying still in the factory area of TBEA Hengyang Transformer Co., Ltd. It is 12.32 meters long and weighs 446 tons, exceeding the capacity of a fully loaded Boeing 747 aircraft. With the instruction issued, the industry's largest ultra-high voltage flexible DC converter transformer slowly started and embarked on a journey to the Yuezhou Station of the ± 800 kV high-voltage project in Gansu Zhejiang. It is not only a combination of steel and copper wire, but also an energy bridge connecting the northwest Gobi and the eastern coast.

Gobi green power spans thousands of miles

Wuwei, Gansu, is a vast desert and Gobi desert with numerous wind turbines and a sea of photovoltaic panels. This place contains abundant wind and solar energy, but it has long faced the dilemma of "unable to transmit electricity and unable to receive it when needed". The Gansu Zhejiang ultra-high voltage flexible direct current transmission project has emerged, which is a key milestone in the national "dual carbon" strategy for the 2370 kilometer long power highway. After the completion of the project, 36 billion kilowatt hours of electricity will flow eastward every year, of which more than half is clean electricity, equivalent to reducing the consumption of standard coal by millions of tons. Yuezhou Station, as the receiving hub, is the "terminal station" for receiving this batch of green electricity.

Hardcore technology breaks through limits

To safely convert such a massive amount of electrical energy, the core equipment must be powerful enough. The rated capacity of the converter transformer shipped this time is as high as 750 megavolt amperes, which is more than 80% higher than conventional DC equipment. A single unit can meet the peak electricity demand of a medium-sized city. In order to tame the technological beasts brought by ultra large capacity and ultra-high voltage, the R&D team has overcome multiple bottlenecks. They have created a single-phase four column split frame iron core and an internal screen continuous valve side coil structure, allowing the equipment to maintain ultimate reliability while efficiently dissipating heat. The innovative magnetic leakage shielding system provides a perfect solution to the industry's headache of large magnetic leakage and local overheating. In June of this year, the product successfully passed the national level appraisal, and its comprehensive performance was recognized as reaching the international leading level.

Digital production line escorts quality

Entering the production workshop of Hengbian Company, the digitally transformed production line is operating efficiently. Faced with the manufacturing challenge of 750 megavolt ampere level equipment, the enterprise optimized the entire process of pressing, lead welding, vacuum drying, and other processes. Under the digital control system, more than 100 quality monitoring points are densely distributed throughout the entire line, and every process from raw materials to finished products can be traced. keywords:Engineering infrastructure

Prior to the shipment of the first equipment, the company, along with transportation and public security departments, conducted multiple simulations and tailored a waterway transportation plan to ensure the safe arrival of this' super heart '. Hengbian Company has undertaken the development task of 7 converter transformers for the station. With the launch of the first equipment, subsequent "hearts" will also be in place to jointly ensure the surging pulse of the "Gan Dian into Zhejiang" artery.Editor/Yang Meiling