Transformer winding loose determination system and method based on finite element analysis

Abstract

The invention discloses a transformer winding loose determination system and method based on finite element analysis. The system comprises a data input module, a data storing module, an analysis determination module, a display output module, a signal conversion module and multiple vibration sensors. The data storing module is provided with a winding loose defect database; the multiple vibration sensors are arranged in different positions of the outer surface of a transformer and are used for acquiring and transmitting vibration signals of the positions to the signal conversion module; the signal conversion module receives the vibration signals and converts the signals into feature signals before transmitting to the analysis determination module; the data input module inputs the monitored transformer performance parameters to the analysis determination module; the analysis determination module extracts the matched loose threshold from the winding loose defect database according to the transformer performance parameters, compares with the feature signals and judges whether the transformer winding loose exists or not. By the aid of the method, the problem that since a loose threshold is set according to the existing transformer diagnostic method, the reliability and universality are low is solved.

Description

technical field [0001] The invention belongs to the technical field of intelligent substations, and in particular relates to a transformer winding looseness judgment system and method based on finite element analysis. Background technique [0002] The structure of transformers in modern power systems is relatively complex and consists of many parts. Therefore, when the transformer is bumped during transportation or an external short-circuit fault occurs during operation, it may cause winding looseness and deformation faults. The long-term operation of the transformer in this state will bring great harm to the safe operation of the power grid. As an electromagnetic device, the transformer will vibrate during operation. The internal faults and performance changes of the transformer will be directly or indirectly reflected in the external vibration of the transformer. Vibration method is an effective method for diagnosing latent faults in transformer operation. It can detect ...

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Problems solved by technology

[0006] In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a transformer winding looseness judgment system and method based on finite element analysis, and solve the problem of lack of reliability and universality in setting the looseness threshold in the existing transformer diagnosis method

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