深度限制特高压系统操作过电压的可行性分析

Analysis on Feasibility for Deeply Suppressing Switching Overvoltage in AC UHV Systems

为了深度限制特高压系统操作过电压、降低特高压设备造价及制造技术瓶颈，以淮南-皖南1000kV特高压工程为例，通过电磁暂态计算，对采用两端装设避雷器、合闸电阻与两端避雷器配合、沿线布置一台避雷器以及沿线布置多台避雷器等深度限制过电压方式进行了分析，比较了上述不同方法对操作过电压的限制效果，并从热稳定及老化性能、工频电压耐受特性、能量吸收能力3个方面进行了可行性分析。采用先进的避雷器技术，可将操作过电压水平从1．6U0-1．7U0降低到1．2U0-1．3U0（U0=898kV），实现深度限制操作过电压的目的。

Deeply suppressing the switching overvoltage of UHV systems will reduce the manufacturing cost and tech- nical bottlenecks of UHV power apparatus. Based on the 1 000 kV UHV project from Huainan to Wannan, the switching overvoltages were numerically analyzed. The effects of suppressing the overvoltage for measurements were estimated, such as setting arresters on both ends, cooperation between arresters and closing resistance, setting a set of arresters in the middle of the line, and setting several sets of arresters along the line. The effects of above methods in suppressing the switching overvoltages were compared, and the feasibility was analyzed in aspects such as aging characteristics, the with- stand capacity of power frequency overvoltage, and energy absorption capacity. On the baisis of advanced surge arrester technology, we can decrease the overvoltage level from 1.6U0-1.7U0 to 1.2U0-1.3U0（U0=898 kV）, to realize the target to deeply suppress the switching overvoltage.