A voltage transformer winding working state detection method and system

Abstract

The embodiment of the invention discloses a voltage transformer winding working state detection method and system. A present vibration frequency response curve of each measuring point can be accurately obtained through carrying out frequency sweep exciting tests on a voltage transformer winding, and can be converted into a mode of matrix; data of all the frequency points is taken into consideration so as to raise the precision of detection; and minimal deformation of the voltage transformer winding can be reflected in the present vibration frequency response curve, so that very high sensitivity is gained; and normalization processing is further carried out on the vibration frequency response matrix to realize data nondimensionalization and raise the calculating efficiency; then eigenvalue decomposition is carried out on a covariance matrix obtained through calculating of historical vibration frequency response curve matrixes to determine the number of principal components; principal component decomposition is carried out on the covariance matrix; afterwards, transformation is carried out on the present vibration frequency response curve matrix by column according to the matrix obtained through decomposition; and finally, through calculating a mean value and a control limit of statistics, whether abnormities such as deformation occur to the voltage transformer winding is determined quantitatively, thereby realizing extremely high precision.

Description

technical field [0001] The invention relates to the technical field of signal monitoring, in particular to a method and system for detecting the working state of a transformer winding. Background technique [0002] Power transformer is the key component of power transmission, which directly determines the stability and reliability of power system operation. As the capacity of my country's power grid continues to increase, the short-circuit capacity increases accordingly; once a short-circuit is formed at the transformer outlet, a large short-circuit current flows through the transformer winding, generating a huge electromagnetic force; under the action of the electromagnetic force, the transformer winding It is easy to loosen or deform, causing transformer failure and even power system collapse. Therefore, it is an important measure to ensure the safe operation of the transformer to detect the working state of the transformer winding and find the winding deformation in time....

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method and system for detecting the working state of transformer windings to solve the problems of poor practicability and poor accuracy in detecting the working state of transformer windings in the prior art

Images