"Step-down", "power-off", "wiring" and "wire removal", "Attention to all personnel, the latter test is completed!" At 4:30 p.m. on December 15, in the high-altitude and high-voltage laboratory high-voltage test hall of the State Grid Qinghai Electric Power Research Institute, the factory test of the 750 kV transformer from Qinghai to Henan ± 800 kV UHVDC transmission project was successfully completed.

It is reported that the Qinghai-Henan ± 800 kV UHVDC transmission project is a key project of the "13th Five-Year Plan" for the development of national electric power, and is a clean energy transmission channel in China, which is of great significance for ensuring national energy security, promoting economic growth in the western region, and promoting China's clean energy transformation.

According to Yang Xiaoku, president of Qinghai Electric Power Research Institute, the factory test of transformer can timely find out whether there are defects in the material, process defects, degree and location of the internal insulation of the transformer, and take targeted measures to prevent the occurrence of transformer failure, which is an important "physical examination" index to ensure that the new transformer is qualified to leave the factory. Previously, our domestic 750 kV and below transformer factory test was completed in the transformer manufacturer, in Qinghai high altitude and high voltage laboratory high voltage test hall to complete all 750 kV transformer factory test, which is the first time in China, for the State Grid Qinghai Provincial Electric Power Company to change the way of thinking, innovative management, to achieve the laboratory market open operation has taken an important step.