Transformer winding deformation fault diagnosis method based on three-dimensional frequency response curve centroid analysis

Abstract

A transformer winding deformation fault diagnosis method based on three-dimensional frequency response curve centroid analysis comprises the following steps that a transformer winding lumped parameter model is established, and normal winding amplitude-frequency data and phase-frequency data are obtained; adjusting circuit parameters of the transformer winding lumped parameter model, and obtaining amplitude and phase data of the winding in different fault states; presenting the obtained frequency, amplitude and phase as x, y and z values in a three-dimensional Cartesian coordinate system, and establishing a three-dimensional frequency response curve; respectively calculating centroid coordinates represented by the frequency, the amplitude and the phase, and visualizing the obtained coordinates to obtain centroid distribution of each three-dimensional frequency response curve; and a three-dimensional coordinate system is established, mass centers of different fault three-dimensional frequency response curves are distributed around the three-dimensional coordinate system, and the fault types of the winding are determined according to different mass center distribution intervals. According to the method, the fault types of the winding can be sensitively and effectively distinguished according to different centroid distribution intervals of the three-dimensional frequency response curve.

Description

Technical field [0001] The present invention relates to the field of transformer winding fault diagnosis, specifically to a transformer winding deformation fault diagnosis method based on three-dimensional frequency response curve centroid analysis. Background [0002] Transformers are one of the most expensive assets in a power system. The cost of repairing the transformer after the transformer failure is extremely expensive, and the transformer failure often causes the interruption of the power supply, and once the failure occurs, it will have a great impact on the normal operation of the substation, resulting in greater property loss. Power transformers usually have a harsh working environment, so they are prone to a variety of faults, and winding deformation is one of them. In the event of a short-circuit accident, the strong current will cause the transformer windings to be distorted, bulging or shifting and other permanent instability deformation, which will cause the trans...

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Problems solved by technology

However, due to the lack of relevant criterion support for the winding deformation state of the frequency response detection results, the quantitative diagnosis of the transformer winding deformation type and degree has not yet formed a unified standard, and personnel with rich professional experience are required to accurately identify

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