Using the vibration frequency response analysis method to detect the winding deformation of power transformer

Abstract

In order to further investigate the vibration performance of power transformer for the detection of winding deformation based on the vibration frequency response analysis (VFRA) method, the electro dynamic forces of the winding of power transformer are calculated first by virtue of the fieldcircuit coupled finite element method. Then the axial vibration model of the winding is built and the harmonic response analysis is done to study the vibration performance with the obtained results of electro dynamic forces when the winding is in healthy condition and in fault condition. The experiment of vibration frequency response for the 220kV transformer is made via the developed vibration measurement system. Calculated results and experimental results are agreed well when the winding is deformed with the preset fault of the drop of winding block. Moreover, it is verified again by the experimental results that the vibration analysis method to detect the winding deformation is more sensitive than that of leakage reactance method.Index Terms-Power transformer, winding deformation, electro dynamic force, finite element method

Converter Transformer Winding Mechanical Condition Detection Using Online Vibration Frequency Response Analysis Method

“…The vibration acceleration of offline VFRA is obtained with different frequencies of constant current, and its VFRF reflects the amplitude-frequency characteristics of acceleration (m/s 2 ) and frequency (Hz) [19][20][21][22][23]. The VFRF of online VFRA represents the amplitude-frequency characteristics of [acceleration/current squared] (g/A 2 ) and frequency (Hz).…”

“…The existing VFRA is mainly proposed according to the features of ordinary power transformers. Because the winding of ordinary power transformer flows through the power frequency current, like the conventional FRA, VFRA also requires the external input from sweep power supply [19], [20]. The basic operation [21]: one side of the winding is short-circuited and sinusoidal currents with constant amplitude and different frequencies are injected into the other side of the winding, and then the winding vibration signals are collected.…”

Vibration analysis system applied to fault detection in wind turbines

“…The economic use of wind resources requires wind farms to be installed in remote sites with high average wind speeds (Ullah, 2005;Kan et al, 2005). The profitability of wind farms depends on many factors, one of the most important is their adequate operation which requires a proper maintenance (Yang et al, 2008a(Yang et al, y 2008bDoguer and Strackeljan, 2009;Hassan et al, 2012;Wang and Jin, 2011).…”

“…The dynamic behavior in the wind turbine, due to vibration frequencies of the rotating blades, wind turbine structure and fixed tower, are highly important in the design stage when the machine is under lateral loads (Zhiqiang et al, 2009;Fitzgerald et al, 2010). This is why many researchers have focused on developing methods for predicting the natural frequencies of vibration in order to detect failures in the system Uys et al, 2007;Malinowski et al, 2015;Wang and Jin, 2011).…”