A voltage transformer winding state detection method and an apparatus thereof

Abstract

The embodiment of the invention discloses a voltage transformer winding state detection method and an apparatus thereof. 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 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; normalization processing is further carried out on the vibration frequency response matrix to realize data nondimensionalization and raise the calculating efficiency; then a historical vibration frequency response matrix is decomposed into a non-negative matrix with a certain degree of sparseness; the proportion of basis vectors in overall data is raised, so that prominent features are represented by vectors of extremely few dimensions; and finally, through calculating a mean value and a control limit of statistics, whether abnormities such as deformation occurs 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 transformer winding state detection method and device. 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 state of the transformer winding and find the deformation of the winding in time. [0003] At present,...

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Problems solved by technology

[0005] The embodiment of the present invention provides a transformer winding state detection method and device to solve the problems of low sensitivity and poor accuracy of transformer winding state detection in the prior art

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