架空输电线任一点不对称短路时OPGW线路电流的分布研究

Analysis of asymmetric short-circuit current distribution in OPGW overhead transmission line system

在架空输电系统中,光纤复合架空地线(OPGW)的应用越来越多。架空输电线路发生不对称故障时,短路电流在OPGW线上的分流对电力系统的安全具有重要的影响。在OPGW线的设计和选型中,也需要考虑到发生不对称故障时短路电流在OPGW线上的具体的电流分量值。分别讨论了不对称短路发生在杆塔处和两杆塔之间的情况,分析了采用网孔法对输电线路发生不对称故障时的短路时,对短路电流在OPGW线上的分布进行了量化计算,同时得到了故障发生在杆塔处流经OPGW线上电流较大的结论,最后经过实际工程的算例来进行验证。

In overhead transmission system, optical fiber composite overhead ground wire （OPGW） is more and more popular. When asymmetric short-circuit occurs on the transmission line, the distribution of the current on OPGW has a significant influence on power system. When designing and selecting the OPGW, the exact value of the current flowing on the OPGW with the asymmetric short-circuit should also be taken into consideration. Short-circuit occurring at the power tower and between the power towers are individually discussed in this paper. What＇s more, the mesh current method is used to analyze the quantified calculation of the current flowing on the OPGW with the asymmetric short-cir- cuit. At the same time, the conclusion that current flowing on the OPGW line is much greater when short-circuit occur- ring at the power tower than between the power towers is drawn. Finally, the conclusion is verified in an actual project example.