Current transformer iron core coil fault diagnosis method based on spectral analysis

Abstract

The invention discloses a current transformer iron core coil fault diagnosis method based on spectral analysis. The method comprises the following steps of classifying typical faults of a current transformer iron core coil; establishing a current transformer equivalent circuit model under the typical faults, and obtaining equivalent circuit parameters of a current transformer iron core coil in a healthy and fault state; constructing a frequency spectrum response analysis circuit, acquiring frequency spectrum characteristic response curves of the current transformer under health, different fault types and different fault degrees, acquiring frequency spectrum change characteristics of the transformer in fault, and establishing a frequency spectrum characteristic library reflecting the state of the current transformer; and acquiring the current frequency spectrum characteristic curve of the current transformer iron core coil, then analyzing the frequency spectrum characteristics, comparing with data in a frequency spectrum characteristic library for analysis, and determining the fault type and the fault degree of the transformer iron core coil. According to the method, accurate diagnosis of the fault reason and the fault degree of the transformer iron core coil is achieved, and the defect that the specific fault type and the fault degree cannot be judged through an existing common method is overcome.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of current transformers, and in particular relates to a method for diagnosing faults of iron core coils of current transformers based on frequency spectrum analysis. Background technique [0002] Current transformers are key equipment in substations, and their accuracy and reliability are crucial to the safe and stable operation of power systems. The accuracy of current transformers ensures the safety and reliability of functions such as energy metering and relay protection in power systems. The iron core coil is the key sensing component in the current transformer, and its performance is related to the reliability of the entire measuring transformer. At present, there are few researches on the fault diagnosis of current transformer core coil, and the slight deformation of the current transformer coil is not easy to be found, and the deformation has a cumulative effect. With the intensif...

AI Technical Summary

Problems solved by technology

[0007] In view of the above technical problems, the present invention provides a method for diagnosing faults of current transformer core coils based on frequency spectrum analysis, which realizes accurate diagnosis of fault causes and fault degrees of current transformer core coils, and solves the problem that current common methods cannot judge specific faults. Insufficient type and degree of failure

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