光纤光栅传感器在变压器多参量智能监测中的应用研究

随着变压器向超高压、大容量、智能化方向发展，现有的监测方法无法准确捕捉变压器运行状态中的潜在故障。基于光纤光栅传感器的原理，提出了一种用于智能变压器多参数监测的光纤光栅温度和油位传感器。对温度传感器和油位传感器进行设计，通过试验分析了所设计传感器的特性，并对试验数据用最小二乘法进行拟合。结果表明，变压器温度与温度传感器波长之间存在良好的线性关系，温度灵敏度为10.275 pm/C，拟合度为0.99765。同时，变压器油位与油位传感器波长也存在良好的线性关系，加压和降压灵敏度分别为4.538nm/MPa和4.638nm/MPa，加压和降压拟合度值分别为0.99956和0.99927，可满足智能变压器多参量的监测要求。

Application of a fiber Bragg grating sensor in multi parameter intelligent monitoring of a transformer

With the development of transformers towards ultra-high voltage, large capacity and intelligence, existing monitoring methods can not accurately capture the potential faults in the running state of the transformer. Based on the principle of a fiber Bragg grating sensor, a thermometer and an oil level gauge for multi parameter monitoring of an intelligent transformer are proposed. The thermometer and the oil level gauge are designed, the characteristics of the designed sensor are analyzed through experiment, and the test data are fitted by the least squares method. The results show that there is a good linear relationship between transformer temperature and thermometer wavelength. The temperature sensitivity is 10.275pm/C and the fitting degree is 0.99765. At the same time, there is also a good linear relationship between the oil level of the transformer and the wavelength of the oil level gauge. The sensitivity of pressurization and depressurization are 4.538nm/MPa and 4.638nm/MPa respectively, and their fitting values are 0.99956 and 0.99927 respectively. These values can meet the monitoring requirements of the multi parameters of an intelligent transformer.