A voltage transformer winding working state detection method and system

A transformer winding and working state technology, which is applied in the detection method and system field of transformer winding working state, and can solve problems such as poor accuracy and poor practicability

Active Publication Date: 2016-06-22
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Abstract
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Problems solved by technology

[0005] Embodiments of the present invention provide a method and system for detecting the working state of transformer windings to

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  • A voltage transformer winding working state detection method and system
  • A voltage transformer winding working state detection method and system
  • A voltage transformer winding working state detection method and system

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Embodiment Construction

[0066] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0067] Power transformers are mainly composed of cores, windings, tap changers, oil tanks and accessories. Wherein, the iron core is composed of silicon steel sheets with high magnetic permeability and a clamping device. The clamping device is that the silicon steel sheets are connected together to form a complete iron core structure. A...

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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....

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Application Information

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IPC IPC(8): G01R31/06G01R31/02G01M13/00
CPCG01M13/00G01R31/50G01R31/72
Inventor 于虹钱国超李亚宁
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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