Study On Key Technologies Of Transformer Remote Health Monitoring System Based On Vibration Analysis

As an important equipment to realize energy conversion in power transmission and distribution,power transformer has the characteristics of large quantity,non-centralized distribution and high security requirements.It is difficult for grid personnel to find out potential transformer faults in time by regular inspection.Once the transformer accident occurs,it will not only cause huge economic losses,but also seriously affect the normal order of production and life in society.Therefore,remote health monitoring of transformers is of great value for improving the safety of transformer operation and ensuring stable operation of the power grid.The vibration signal of transformer can reflect its mechanical state sensitively,and has the advantage of being able to react to the early mechanical failure of the transformer.Therefore,it is of great significance to carry out the design and research of transformer remote health monitoring system based on vibration analysis method.Firstly,the thesis analyzed the mechanism of transformer vibration and the characteristics of vibration transmission.Based on the principle of vibration analysis method and combined with the actual needs of the system for remote,online,long-term monitoring,centralized data management and analysis,the system is designed into two parts: on-site monitoring platform and remote health monitoring center.The data interaction between the two parts is realized through wireless network.On this basis,the fiber grating sensing technology,embedded technology,wireless data transmission technology,and distributed storage technology involved in the system are analyzed and selected,which provides a theoretical basis for system design and construction.Secondly,aiming at the problem that there is strong electromagnetic field interference in the transformer and the traditional vibration sensor based on electrical signal can not measure the internal vibration,a core vibration measurement method based on Fiber Bragg grating strain sensing technology is proposed.A transformer model was built to test and verify the measurement method.The results show that the method can effectively measure the vibration signal generated by the magnetostriction of the iron core and can be used to judge the fault condition of the iron core,and realize the independent measurement of the iron core vibration signal.Then based on the embedded technology and wireless data transmission technology,the software and hardware system of the on-site monitoring platform is designed and realized with the idea of modularization,including the functions of box surface vibration signal detection,iron core vibration signal detection,data storage,wireless data transmission and so on.The designed on-site monitoring platform was used to detect the vibration signal generated by the laboratory vibration exciter,and the result showed that the vibration signal can be accurately measured and the vibration data can be stored and transmitted.Finally,a transformer remote health monitoring center was built based on distributed storage technologies Kafka,HDFS,HBase,and Zookeeper,which realized the reception,display,analysis,storage and management of the vibration signal data sent by the on-site monitoring platform.Through the designed remote online health monitoring system,the surface vibration signal of a newly produced SZ11-50000/110 transformer was monitored.The results showed that the remote health monitoring system was working normally and could realize remote online monitoring of the transformer vibration signal.The transformer remote health monitoring system based on vibration analysis method designed in this thesis has the advantages of safety,scalability,strong performance,and centralized data management.It provides an effective monitoring program for power transformer condition monitoring,and has important application value and practical significance.