分布式光纤传感在大型变压器温度和绕组变形监测中的应用研究

Research on Application of Distributed Optical Fiber Sensing in Monitoring of Temperature and Winding Deformation of Large Transformer

为实现对变压器绕组全长温度、应变信息的分布式监测,对一台110kV变压器进行了改造,在其低压绕组和中压绕组上布置传感光纤,探究诸如外部布带包裹式、外部纸包裹式等多种适用于不同类型绕组的光纤布置方式在变压器内部应用的可能,其应用范围可拓展至新生产的智能变压器和返厂变压器的智能化改造。还探究变压器内部传感光纤的引出方式及布线方法,改造完成的变压器经例行试验和型式试验验证符合出厂标准。使用BOTDR、BOTDA、ROTDR等多种分布式光纤传感手段实现对温升试验过程中绕组温度实时监测以及短路试验前后绕组变形情况监测,探究基于分布式光纤传感技术的变压器状态监测数据处理方法,获得变压器在运行过程中的绕组温度场分布以及短路冲击后的应变场分布。

In order to realize the distributed monitoring of the temperature and strain information of the full length of the transformer windings,a 110kV transformer was modified,and sensing fibers were arranged on its low-voltage winding and medium-voltage winding.The paper-wrapped optical fiber arrangements suitable for different types of windings could be used inside transformers,and their application range could be extended to the intelligent alteration of newly produced transformers and returned transformers.The lead-out method and wiring method of the sensor fiber inside the transformer were also explored.The modified transformer was verified by routine tests and type tests to meet the factory standards.Using BOTDR,BOTDA,ROTDR and other distributed optical fiber sensing methods,the real-time monitoring of winding temperature during the temperature rise test and the monitoring of winding deformation before and after the short circuit test can be realized.The data processing method of transformer condition monitoring based on distributed optical fiber sensing technology was explored,and the winding temperature field distribution during the operation and the strain field distribution after short-circuit impact were both obtained.