Transformer winding and iron core fault diagnosis method based on vibration characteristic

Abstract

The invention relates to a transformer winding and iron core fault diagnosis method based on a vibration characteristic. The methods comprises the steps that the time domain sequences of an original vibration signal and a to-be-detected vibration signal are collected; the time domain sequences are respectively transformed into respective frequency domain sequences; the frequency domain sequences of an original iron core vibration signal, an original winding vibration signal, a to-be-detected iron core vibration signal and a to-be-detected winding vibration signal are determined; data processing are carried out on the frequency domain sequences of the original iron core vibration signal, the original winding vib ration signal, the to-be-detected iron core vibration signal and the to-be-detected winding vibration signal; and fault diagnosis is carried out according to the data processing result. The method provided by the invention realizes the separation of iron core and winding vibration signals, can effectively reflect the vibration states of a winding and an iron core of a transformer, and has the advantages of accurate monitoring result and strong practicality.

Description

Technical field: [0001] The invention relates to a fault diagnosis method for transformer windings and iron cores, and more specifically relates to a fault diagnosis method for transformer windings and iron cores based on vibration characteristics. Background technique: [0002] The power transformer is one of the most important equipment in the power system, and its reliable operation is of great significance for maintaining the stability of the power system. In recent years, with the increase of the load capacity of the transformer, the short circuit at the outlet of the transformer causes the surge current flowing through the winding coil to increase, resulting in the deformation of the winding; in addition, due to the long-term operation of the transformer, the pressing force of the iron core is weakened, and the accidents of silicon steel sheet loosening occur frequently , Seriously cause the iron core to bend and deform, destroy the mechanical stability of the transfor...

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Problems solved by technology

However, this method is only aimed at analyzing the vibration parameters of the transformer under the condition of specific fault loosening. It does not effectively separate the vibration signals of the winding and the iron core, and cannot effectively monitor other fault states such as winding deformation and iron core grounding. There are certain limitations in the accuracy, validity and practicality of

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