750kV输变电技术研究

针对“西北电网750kV输变电工程关键技术的研究”的重点课题，介绍了750kV系统过电压及绝缘配合、外绝缘特性及海拔修正、电磁环境影响和750kV带电作业方式的研究成果，给出了750kV输变电工程系统过电压和设备的绝缘水平、各种电压下杆塔的间隙放电特性曲线、电磁环境所要求的限制和带电作业方式的最小间隙和组合间隙，研究成果已直接用于西北电网750kV输变电工程的设计。西北电网750kV输变电工程关键技术的研究和工程的顺利投运，对促进我国特高压电网的建设和研究具有积极意义。

Study on 750 kV power transmission and transformation technology

The study results about 750 kV external insulation property, over voltage and insulation coordination, electromagnetic environment influence and on-line operation were introduced. The over voltage value and insulation level of 750 kV transmission project equipments, the flashover property curve of lightning and switching impulse voltage as well as power frequency voltage, the limited value of electromagnetic environment parameter, the minimal clearance and minimal combination clearance of on-line operation were presented. These study results have been used in design of 750 kV transmission project in Northwest China Power Grid.