半波长输电线路故障暂态过电压特性研究

Research on Characteristics of Transient Overvoltages Caused by Faults Occurred in Half-Wave Length AC Transmission Lines

阐述了半波长输电线路故障暂态过程的沿线电压分布特性,构建了典型特高压半波长输电线路的仿真模型,采用电磁暂态计算程序对线路单相接地故障、自动重合闸过程的过电压进行了分析,研究了线路传输功率、人工调谐网络、线路长度等因素对线路故障暂态过电压的影响。分析了沿线装设多组避雷器对半波长输电线路故障暂态过电压的抑制效果,研究了避雷器的安装位置与安装数量对故障暂态过电压水平的影响。仿真结果表明,沿线装设5组避雷器时,半波长输电线路故障暂态过电压水平可限制在1.60 pu以下,但对避雷器的通流容量要求较高。研究结果为发展半波长交流输电技术提供了参考依据。

The distribution behavior of the temporary overvoltages caused by single-phase-to-ground fault along half-wavelength AC transmission line （HWACTL） is expounded and a simulation model for typical HWACTL is built. The overvotlages caused by single-phase-to-ground fault and autoreclsore process are analyzed by ATP-EMTP software, and the impacts of such factors as transmission capacity, artificial tuning and line length on transient overvoltage of tranmission line are researched. The effect of suppressing fault-caused transient overvotlage in HWACTL by installing multi-set of metal oxide an＇ester （MOA） along HWACTL is analyzed and the influences of both installation positions and installation number of MOAs on fanlt-caused transient overvoltage level are researched. Simulation results show that when five sets of MOA are inistalled along the line, the fault-caused overvoltage of HWACTL can be restricted to lower than 1.6 pu, however the discharge capacity of MOA should be higher.