Transformer winding deformation online monitoring method and device based on transient traveling wave

Abstract

The invention relates to a transformer winding deformation online monitoring method and device based on a transient traveling wave. The method comprises the following steps of installing traveling wave measuring sensors on the high voltage side casing pipe and the low voltage side casing pipe of a transformer, and monitoring and collecting the transient traveling wave signals of the input and output ends of a transformer winding in real time; when the transformer winding is normal, identifying and classifying the transient wave signals of the input end, and carrying out wavelet packet decomposition characteristic extraction on the response signal of the output end so as to establish a big data sample library; according to a current real-time measured transient traveling wave signal identification result, calling a response sample under the effect of the same type of transient signals in the sample library to compare with a current response, and calculating a correlation coefficient; and using a correlation coefficient threshold to judge the deformation of the winding. In the invention, transformer winding deformation can be monitored in an online mode, anti-interference performanceis good and accuracy is high.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of electric power equipment, in particular to an on-line monitoring method and device for transformer winding deformation based on transient traveling waves. Background technique [0002] In recent years, with the continuous expansion of the capacity of my country's power grid and the rapid economic growth, the requirements for the safe and stable operation of the power grid have become higher and higher. Transformers are one of the important equipment in the power system, and their safe and stable operation is related to the reliability of the power supply system. . When the transformer suffers from the short-circuit impact of the outlet, the winding may bear a large force under the action of large current and strong magnetic field, which may easily cause the winding to be bulged, twisted, dislocated, and other deformations to varying degrees, which may result in long-term accumulation....

AI Technical Summary

Problems solved by technology

[0005] In view of this, in view of the shortcomings of the above transformer winding deformation detection method, the present invention proposes an online transformer winding deformation monitoring method based on transient traveling waves, which can monitor the winding state of the transformer during operation, and has the advantages of simple structure, easy installation, High detection accuracy, online detection, etc.

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