Transformer Winding Vibration Research Articles

A study of dual-cantilever beam FBG sensing detection of transformer winding vibration

A study of dual-cantilever beam FBG sensing detection of transformer winding vibration

Study on Vibration Characteristics of Transformer Winding

Compared with the existing winding deformation detection technologies, such as the frequency response method and short-circuit reactance, the vibration analysis method can effectively detect the loose state of windings. This paper has carried out mechanism analysis and experimental study on the change of winding modal characteristics caused by two kinds of defects, analyzed the transmission characteristics of three-phase double winding transformer winding vibration in the transformer oil and structure, studied the influence of pad falling off, plastic deformation and other defects on the mechanical state of the winding, calculated the winding short-circuit vibration signals corresponding to different mechanical states, and extracted the vibration characteristics that can effectively reflect the mechanical state of the winding. The research conclusion can provide an important basis for transformer fault diagnosis.

Vibration of circular rings coupled by elastic elements

The three-dimensional vibration of circular rings coupled by elastic elements is investigated in this paper. The vibration characteristics of a single circular ring are examined first analytically and experimentally and then used as building blocks for a stack of concentric rings connected by elastic insulators, which is used as an approximate-model of a disk-type transformer winding. The key outcomes of this research are a more realistic model for transformer winding vibration and determining its three-dimensional vibration characteristics. The model is also verified experimentally. An experimental-based numerical method is also developed for identifying the stiffness and damping properties of the elastic elements.

变压器绕组振动特性研究

在理论分析影响变压器绕组振动各因素的基础上，利用ANSYS建立变压器有限元模型仿真分析，验证了不同的预紧力大小对绕组振动固有频率的影响。利用变压器振动在线监测系统，对变压器油箱表面测得的振动信号进行了研究，实验验证了变压器绕组振动主要集中在基频100 Hz处，且基频幅值与负载电流的平方满足正比例关系。 On the basis of theoretical analysis of various factors affecting the vibration of transformer windings, the finite element model simulation analysis of the transformer was built by ANSYS. The effect of different precompression on the natural frequency of winding vibration was verified. The vibration signal of the transformer tank surface was studied by the on-line monitoring system of the transformer vibration. The experimental results showed that the vibration of the transformer windings was concentrated in the fundamental frequency 100 Hz. The amplitude of the fundamental frequency was proportional to the square of load current.

Axial Vibration Analysis of Transformer Windings Under Short Circuit Conditions

This paper describes two methods of calculating the axial vibration of transformer windings under short circuit conditions.