基于光纤传感稳态热容平衡模型的架空线路导线温度监测

Temperature Monitoring of Overhead Line Conductor Based on Optical Fiber Sensing Steady-State Heat Capacity Balance Model

架空线路温度监测过程中,受环境温度、日照等因素的影响,导致其监测数据失真,降低监测准确度。提出基于光纤传感器的架空线路导线温度监测方法。建立架空线路导线的稳态热容平衡模型,分析影响导线温度相关因素。通过光纤温度传感器得到热膨胀的反应系数,计算求得光纤布拉格光栅对温度变化的灵敏度系数,构建传感稳态热平衡方程。结合环境温度、风速和日照辐射等参数,利用导线温升公式计算出传感导线各部位热阻值,获得相对应温度监测数据,实现架空线路导线温度监测。实验结果表明,所提方法在不影响线路正常运行情况下,实验测得导线上表面、侧方位和下表面的温度分别为27.8℃、26.6℃和23.4℃,温度监测准确,误差小。

In the process of overhead line temperature monitoring,due to the influence of environmental temperature,sunshine and other factors,the monitoring data is distorted and the monitoring accuracy is reduced.A temperature monitoring method for overhead line con-ductor based on optical fiber sensor is proposed.The steady-state heat capacity balance model of overhead line conductor is established,and the factors affecting conductor temperature are analyzed.The response coefficient of thermal expansion is obtained through the fiber temperature sensor,the sensitivity coefficient of fiber Bragg grating to temperature change is calculated,and the sensing steady-state thermal balance equation is constructed.Combined with the parameters such as ambient temperature,wind speed and sunlight radiation,the thermal resistance of each part of the sensing conductor is calculated by using the conductor temperature rise formula,and the corre-sponding temperature monitoring data are obtained to realize the overhead line conductor temperature monitoring.The experimental re-sults show that,without affecting the normal operation of the line,the temperatures of the upper surface,the side orientation and the low-er surface of the conductor measured by using the proposed method are 27.8℃,26.6℃and 23.4℃respectively.The temperature mo-nitoring is accurate and the error is small.