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The vibration of power transformer on oil tank is mainly come from the vibration of transformer core and winding and consists the variable information of mechanical condition. This paper through setting lack of clamping pressure in both winding and core as well as radial displacement of HV wingding in a 10/0.4 kV power transformer with three phases. Using the vibration eigenvalues in spectrum, such...
In order to improve the accuracy of on-line application and winding condition assessment of pulse frequency response method, this paper proposes a short time Fourier transform (STFT) algorithm to construct the pulse frequency response curve of the transformer windings, trying to solve the problem of the fast Fourier transform, (FFT) algorithm is not suitable for dealing with transient signal. PSPICE...
When online detecting transformer winding deformation with impulse frequency response analysis, the time domain characteristics of transient signal could not be depicted by conventional frequency response curves, and the limitations of Fast Fourier Transform could result in deletion of available information. In this paper, continuous wavelet transform is used to process transient signal, which is...
The vibration of power transformer is closely related to the mechanical condition of transformer and current when the external short circuit occurs. In this paper, the vibration sensors based on piezoelectric effect are attached to the oil tank of transformer to acquire the vibration signals in short circuit condition, and then the transfer function is applied to study the relationship between the...
The power transformer is the most important equipment in the power system, so the condition-based maintenance of the transformer has an important significance for the safe and stable operation of the power grid, and condition assessment provides an important basis for the condition-based maintenance. In this paper, the calculation principle of the reliability assessment method is analyzed, and the...
Power transformers have important roles as voltage converters in substations, which directly affect the safe operation of power grids. Online monitoring of winding deformation, which is one of the most common transformer faults, is crucial in protecting transformers from damage, particularly those induced by short-circuit current failures, and ensuring their safe operation. This study proposes an...
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