Method for identifying partial discharge mode of transformer

Abstract

The invention discloses a method for identifying a partial discharge mode of a transformer. A three-dimensional spectrogram and a two-dimensional spectrogram that are used for studying a partial discharge PRPD mode are generated; partial discharge characteristic parameters are extracted from the spectrograms; on the basis of a clustering analysis, division of modes to which partial discharge characteristic parameter classes belong is carried out; and then dissimilarity degrees of the characteristic parameter classes are compared by using an artificial neural network to determine a partial discharge mode, and an identification case database is obtained. According to the invention, on the basis of combination of the clustering analysis method and the artificial neural network, the method for constructing a partial discharge characteristic parameter identification base is created, so that missing of discharge information during the identification and analysis is avoided and the accuracy of diagnosing the partial discharge defect is improved; and thus the potential defect of the transformer can be found out early to avoid occurrence of a power safety accident.

Description

technical field [0001] The invention belongs to the technical field of research and application of transformer insulation detection, and in particular relates to a method for identifying partial discharge modes of transformers. Background technique [0002] The insulation condition of a power transformer is one of the main conditions that determine its operational reliability and system stability, and one of the main causes of transformer insulation aging and damage is partial discharge, which is the local breakdown that occurs inside the insulating medium between conductors a kind of discharge. This discharge may occur within the insulation or adjacent to the conductor. Partial discharge includes internal discharge and surface discharge. The internal discharge refers to the partial discharge in the internal gap of the insulating medium, which may occur near the conductor; and the surface discharge refers to the partial discharge above or along the insulating surface. The...

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Problems solved by technology

[0006] The above situation makes it difficult for the existing monitoring technology to truly reflect the actual discharge situation inside the transformer, which affects the timely discovery and disposal of latent defects in power transformers. Therefore, it is necessary to establish a method for reliably identifying partial discharge modes of transformers, so as to accurately and early detect Latent Defects of Equipment

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