Transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics

Abstract

The invention relates to a transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics. The transformer winding deformation fault diagnosis method comprises the following steps: 1) measuring frequency sweep short circuit impedance data of a transformer three-phase winding through a testing device under the power failure state of a transformer; 2) obtaining three diversity factor curves of the frequency sweep short circuit impedance data of the three-phase winding measured in step 1); 3) comparing three diversity factor curves DAB, DBC and DCA calculated from step 2) with standard diversity factor curves, diagnosing that the winding has slightly deformation when any one diversity factor curve exceeds attention value curves of the standard diversity factor curves; otherwise diagnosing that the winding has no deformation; and if the diversity factor curves exceed alarm value curves of the standard diversity factor curves, diagnosing that the winding has obvious deformation. The transformer winding deformation fault diagnosis method is accurate and sensitive to diagnose, easy to implement, and strong in field maneuverability and can be widely applied to fault diagnosis of transformer winding.

Description

technical field [0001] The invention relates to a transformer winding deformation fault diagnosis method, in particular to a transformer winding deformation fault diagnosis method based on frequency-sweeping short-circuit characteristics. Background technique [0002] Winding is an important part of large-scale power transformers, and it is also the focus of transformer accidents. After the deformation of the windings, it will bring serious hidden troubles to large-scale power transformers. If the transformer is impacted by short-circuit current at this time, it will often cause serious transformer accidents and Power outage accidents cause significant social and economic losses. The detection and diagnosis of transformer winding deformation is of great significance to ensure the safety of the power grid and the reliability of power supply. [0003] Sweep frequency short-circuit impedance test is a new method to detect transformer winding deformation. Its principle is: after...

AI Technical Summary

Problems solved by technology

At this stage, the frequency sweep short-circuit impedance test technology of transformer windings has become increasingly mature, but it lacks the analysis method of frequency sweep short-circuit impedance data, the method of feature extraction and the fault diagnosis method of judging the winding deformation through the characteristics of frequency sweep short-circuit impedance, especially the lack of accurate judgment , operable, easy to promote and apply quantitative fault diagnosis method, making it difficult to apply the technology

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