OPGW的选型及有关问题的探讨

Discussion about choices of OPGW and the concerned problem

文章结合承德—姜家营500 kV线路工程的设计,从高压送电线的地线采用复合光缆的角度,着重论述了OPGW在工程中的重要作用。从OPGW的热稳定及耐雷方面介绍了OPGW及分流线的选型原则。通过计算确定OPGW和分流线的不同组合达到最合理的配置。根据我国各地区已运行的500 kV线路工程的运行经验,分析了OPGW在工程中遭受雷击断股的原因,提出了防雷的措施。OPGW的选型和分流线的合理配置应保证在强电流和雷击等不利条件下,既能保证通信要求又能起到避雷的作用。现工程设计中已普遍采用使用粗细光缆的配置,达到减少工程造价的目的。

This paper presents the important function of OPGW from the application point of view on high voltage overhead transmission lines adopted composite optical fibers as ground wires, for example, the Chende to Jiangjiaying 500 kV transmission line project designed by NCPE. The principles of selecting the OPGW type and diffluent wires type are introduced from the aspect of OPGW＇s thermal stability and the characteristic of bearing lightning strike. The most reasonable configure can be achieved by determining dif- ferent combinations of OPGW and diffluent wires through calculation. The reason of OPGW suffering lightning and broken strands is analyzed, which was based on the running experiences of the existing 500 kV transmission line projects in various areas of China, and then the way of lightning-protection is found. Not only to satisfy the communication demand but also to ensure lightning func- tion, both should be ensured in bad conditions of large current or lightning strike. The combinations of thick and thin optical fibers have been applied widely on common project designs to reduce cost.