榆横-潍坊1000 kV特高压交流输电线路检修接地方案研究

Research on Grounding Scheme of 1 000 kV UHV AC Transmission Line in Yuheng-Weifang During Maintenance

特高压并架输电线路一回运行、一回检修时,出现长距离不带电作业的线路平行于运行的交流特高压输电线路,停电检修线路因带电运行线路的影响而产生感应电流,会造成设备及人身伤害。本文从现场实际检修情况出发,计算出在常规接地方案下榆横—潍坊1 000 kV特高压交流输电线路接地线上的感应电流,对接地装置的安装和拆除顺序进行了讨论,再具体分析河北境内线路接地线的感应电流的影响因素,从而对检修方案进行改善。通过总结不同的接地方案下的感应电流特性提出一种较为可靠安全的接地装置安装和拆除方案,最后通过现场试验验证计算结果的有效性。研究结果为特高压同塔双回输电线路检修作业安全以及线路接地方案研究提供了理论依据。

When the UHV parallel transmission line is operated and repaired once, a long-distance uncharged line appears parallel to the running AC UHV power transmission line. The power outage maintenance line generates induced current due to the influence of the live running line, which will cause equipment and personal injury. In this paper, the induced current on the ground line of Yuheng-Weifang 1 000 kV UHV AC transmission line under the conventional grounding scheme is calculated based on the actual on-site maintenance and discuss the sequence of grounding device installation and removal, then specifically analyzes the influencing factors of the induced current on the ground line of the line in Hebei province, so as to improve the maintenance scheme. By summarizing the induced current characteristics of different grounding schemes, a more reliable and safe grounding device installation and removal scheme is proposed. Finally, the validity of the calculated results is verified by field tests. The research results provide a theoretical basis for the maintenance of UHV double-circuit transmission lines on the same tower and the study of line grounding schemes.