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针对日本1000kV特高压输变电系统,从建设的必要性、电压选定和建设规模等方面进行了详细介绍,论述了系统设计过程中重点研究的技术问题,并对其线路设计和变电主设备进行了分析.“,”This paper discussed the necessity of developing 1 000 kV Ultrahigh voltage transmission system,voltage level and building scale in Japan. Some technical problems in the design have been studied. The design of transmission line and substation main equipment have also been analyzed.