OPGW直流融冰过程对通信光纤的影响

目前我国采用直流对导线进行融冰的技术已相对成熟,但对地线和OPGW的直流融冰技术的研究尚处于初始阶段。特别是融冰过程可能对光纤衰减及光纤寿命造成的影响也是电力运管及通信人员普遍关心的问题。文章的试验结果显示,在对OPGW进行通流升温时,内部光纤的环境温度要明显高于OPGW表面温度;关于高温环境对光纤寿命的影响,用光纤涂覆层热失重的方法进行了分析;对某±500 kV实际线路的融冰电流和时间与光纤温度的关系进行了理论计算,结果表明,合适的融冰电流可以满足1 h的融冰时间要求及光纤的安全使用温度。

Effects of OPGW DC De-icing Process on Communication Optical Fiber

Currently, techniques of DC de-icing for phase conductor are relatively mature in China. However, studies on DC de-icing techniques for ground wires and OPGW are still at the initial stage. Especially, power managers and communication operators are commonly concerned about the possible effects of de-icing process on optical attenuation and lifetime of optical fibers. The experiments show that, during the temperature rise by applying heavy current to OPGW, the environmental temperature of the internal fiber was notably higher than the OPGW surface temperature. The effects of high-temperature environment on fiber lifetime were analyzed by way of thermal weight loss of the fiber coating layer. The relationships between de-icing current and time and fiber temperature are assessed for a real ±500 kV power line. The results indicate that the proper de-icing current could meet both requirements of 1-hour de-icing time and the safe operation temperature of the fibers.