半波长交流输电线路的特性与常规线路差异较大,目前尚没有实际工程应用.在工程实施前,开展真型线路试验对半波长输电的特性进行验证十分必要.该文对采用多段750 kV线路串联形成的半波长真型线路进行了研究,提出了半波长真型线路试验路径方案,构建了点对网的真型线路试验系统.采用电磁暂态计算程序(EMTPE)对真型线路的稳态特性进行了研究,分析了沿线装置和线路参数不均匀等因素的影响;研究了半波长真型线路试验系统的过电压特性,并提出过电压的控制措施.研究结果表明:采用多段750 kV线路串联而成的真型线路,其稳态特性与均匀半波长线路基本相符;采用750 kV变电站内避雷器,可以将真型线路试验过电压控制在允许水平内.%The transmission characteristics of half wave AC transmission line is different from that of conventional line, and there is no actual project at present. Before engineering application,it is necessary to carry out the true type line test to verify the characteristics of half wavelength transmission. This paper studies the half wavelength true type transmission line based on the true type line connected with multi section 750 kV line in series,proposes the experimental route scheme of half wavelength true type transmission line and constructs the true type line test system of 'point to grid'. Then, this paper studies the steady state characteristics of the true type line by using the electromagnetic transient and power electronic simulation program (EMTPE), analyzes the influence factors such as the equipment along the line and the uneven parameters of the line,studies the overvoltage characteristics of half wavelength true type transmission line and proposes the control measures for overvoltage. The results show that the steady state characteristic of the true type line with multi section 750 kV line in series is basically consistent with that of the uniform half wavelength line;the arrester for 750 kV system in substations can be used to limit the overvoltage of the true type line at the permitted level.
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