基于OPGW的输电线路覆冰广域监测方法

输电线路大多架设在野外,受自然灾害影响范围较大、程度较深,而覆冰灾害给电网带来的经济损失尤为严重。在分析现有覆冰监测装置的基础上,提出了基于OPGW的输电线路覆冰广域监测方法。该方法以OPGW光缆内部光纤作为传感器,采用光纤布里渊散射技术,结合覆冰广域监测原理模型,分析覆冰与线缆温度变化关系,利用有限元分析软件对OPGW覆冰与未覆冰状态的缆线温度变化进行了热力学仿真。为验证该方法监测的性能及可靠性,在覆冰实验基地进行了现场模拟挂塔试验,试验结果表明,基于OPGW的输电线路覆冰监测能够准确定位和识别覆冰区段与未覆冰区段,实现输电线路覆冰广域监测。

Research of Transmission Line Icing Wide-Area Monitoring Based on OPGW

Transmission lines are erected on the field, affected by natural disasters in larger range and deeper degree, while the icing disasters caused economic losses particularly severe. Based on the analysis of the existing icing monitoring device, we propose the method of transmission line icing wide-area monitoring based on OPGW. The method is based on the OPGW cable inner optical fiber as sensor and optical fiber Brillouin scattering technique, to analyze the relationship between the ice and the cable temperature variation which combines with the ice cover wide-area monitoring principle model. In this paper, the thermodynamic simulation of the cable temperature changes on the OPGW ice and no ice state is established by using the finite element analysis software. To verify the performance of this method, a field test is carried out on a transmission line tower of the icing experimental base. Results show that, transmission line icing monitoring based on OPGW can accurately locate and identify the ice coating section and not iced section, which can realize icing wide-area monitoring.