Transformer winding operating state diagnosis method

Abstract

The invention discloses a transformer winding operating state diagnosis method. The method includes following steps: collecting vibration signals of each testing point of a transformer winding; performing Fourier transformation to the vibration signals to obtain a vibration frequency response curve of the transformer winding; performing inverse Fourier transformation to obtain a free vibration signal of the transformer winding; decomposing the free vibration signal into a plurality of intrinsic mode function components; performing Hibert transformation to obtain Hibert transformation values of the intrinsic mode function components; constructing analytic functions corresponding to each intrinsic mode function component and corresponding Hibert transformation value, and calculating slope of a phase function corresponding to each analytic function, wherein the slopes are intrinsic frequencies of each order of the transformer winding; and judging the state of the transformer winding according to changing of the intrinsic frequencies. By the transformer winding operating state diagnosis method, the operating state of the transformer winding can be accurately and efficiently judged, problems can be found conveniently and timely to maintain a transformer.

Description

technical field [0001] The invention relates to a signal monitoring method, in particular to a method for diagnosing the running state of a transformer winding. Background technique [0002] The transformer is one of the most important equipment in the power system, and its operation stability has a great influence on the safety of the power system. With the increasing capacity of my country's power grid, the short-circuit capacity is also increasing. The huge electromagnetic force generated by the surge current formed by the short-circuit of the transformer outlet poses a serious threat to the mechanical strength and dynamic stability of the transformer winding. At present, the operating environment of substation equipment and lines is not optimistic. The deformation caused by the impact of external short circuit on transformer winding is a relatively common fault in the process of transformer operation, which poses a great threat to the safe operation of the system. [00...

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Problems solved by technology

[0016] The test sensitivity of the frequency response method is higher than that of the short-circuit impedance method. However, due to the complexity of the frequency response waveform, the judgment of the winding condition requires more experience, and it is difficult to form a clear quantitative criterion. Therefore, no criterion has been formed so far.

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