变压器绕组热点温度监测技术的研究

Research on Hot Spot Temperature Monitoring Technology of Transformer Winding

设计基于光纤布拉格光栅(FBG)的温度监测系统,实现对变压器绕组热点温度的实时监测。介绍光纤光栅的测温原理,并利用Ansys中的Maxwell和Fluent模块对变压器的电磁场-流体场-温度场进行仿真,得到热点的具体信息,以便在实际测量时,合理放置光纤光栅传感器的位置。使用FBGA解调模块对检测到的光信号进行处理,完成硬件部分的搭建。在计算机上通过Labview软件调用动态链接库DLL函数完成上位机的设计,可以实现温度和波长的显示,超出用户设定的阈值温度进行报警等功能。最后将硬件部分与软件部分相连接完成整个测温平台的搭建,进行了标定实验和误差分析实验,得出FBG的中心波长与温度之间的拟合关系式并验证了该测温平台的可行性。

Design a temperature monitoring system based on fiber Bragg grating(FBG) to realize real-time monitoring of the hot spot temperature of transformer windings. Introduce the principle of fiber grating temperature measurement, and use the Maxwell and Fluent modules in Ansys to simulate the electromagnetic field-fluid field-temperature field of the transformer to obtain specific information of the hot spot, so that the position of the fiber grating sensor can be reasonably placed during actual measurement. Use the FBGA demodulation module to process the detected optical signal and complete the hardware construction. On the computer, the DLL function of the dynamic link library is called through the Labview software to complete the design of the host computer, which can realize the display of temperature and wavelength, and alarm when the temperature exceeds the threshold set by the user. Finally, the hardware part and the software part are connected to complete the construction of the entire temperature measurement platform.The calibration experiment and error analysis experiment are carried out, the fitting relationship between the central wavelength of FBG and temperature is obtained, and the feasibility of the temperature measurement platform is verified.