UHV power transmission system development demonstration through the National Science and Technology Department acceptance

The “Eleventh Five-Year Plan” major scientific and technological support plan project “Development and Demonstration of UHV Power Transmission and Transformation System” passed the acceptance by the Ministry of Science and Technology in Beijing. State Grid Institute of Electrical Power undertook 6 of the 32 projects and participated in 7 research projects.

The acceptance expert team highly appraised the achievements made by the project and the major supporting role of China's power grid development. It is believed that the project has mastered the core technologies of 1000kV UHV AC and ±800kV DC key technologies and equipment manufacturing, and has occupied the commanding height of the world's UHV technology. It is a 1000kV UHV AC pilot demonstration project and ±800kV DC independently developed, designed and constructed in China. The successful commissioning of the pilot demonstration project provided comprehensive technical support and achieved a major technological breakthrough in China's domestic production of long-distance, large-capacity, low-loss UHV power transmission and transformation core technologies and equipment, and comprehensively improved the transmission and transformation in China. Electrical engineering research, design and equipment manufacturing level.

Over the past few years, the State Grid Institute of Electrical Power has led the organization of nearly 150 scientific research personnel in nine units of domestic research, design, manufacturing, and universities, and has fully participated in the research and development of “UHV power transmission system development and demonstration”. The project has achieved a series of original results by conducting research on the external insulation and corona characteristics, overvoltage and insulation coordination, electromagnetic environment, and equipment testing of the 1000kV UHV AC transmission and transformation project. For the first time, the control measures and limits of the electromagnetic environment of UHV AC transmission and distribution projects in China have been proposed; the power frequency, operational shock, and lightning impulse voltage discharge characteristics under long insulation outside the line have been obtained, and the air gap elevation correction factor has been proposed. The breakdown voltage characteristics and ice flashover characteristics of various insulator strings; the level of power frequency, operation, lightning overvoltage and limiting measures for UHV lines were determined, and measures for limiting VFTO by using isolating switches and switching resistors were proposed; UHV line active and passive interference characteristics, for the first time in the international community to determine the UHV line and various types of radio stations reasonable protection spacing; access to the UHV lines and substations and main fittings corona onset voltage, radio For parameters such as interference and audible noise, the method for correcting the elevation of the conductor's corona voltage was recommended, and the corona loss characteristics of the UHV AC transmission line were obtained. The field test method for the UHV main equipment was proposed.

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