Dry type transformer thermal fault diagnosis method and system

Abstract

The invention discloses a dry type transformer thermal fault diagnosis method and system. The method comprises the following steps: acquiring infrared images of a dry type transformer; acquiring a surface three-dimensional temperature spectrum of the dry type transformer; establishing a surface three-dimensional temperature field distribution database of the dry type transformer under a normal operation condition and a typical fault condition; calculating by using a grey correlation analysis method so as to obtain a weight function of extendable gray correlation analysis of the dry type transformer; establishing a fault meta-model of the dry type transformer and a present article meta-model of the dry type transformer; judging whether the dry type transformer has a typical fault or not according to the weight function of extendable gray correlation analysis of the dry type transformer, and if the dry type transformer has the typical fault, judging the type of the fault; and displayingthe type of the fault and fault alarming information. By adopting the dry type transformer thermal fault diagnosis method and the system, dry type transformer thermal fault diagnosis is carried out onthe basis of infrared three-dimensional temperature spectrums and extendable gray correlation analysis methods, and the fault diagnosis efficiency and accuracy can be improved.

Description

technical field [0001] The invention relates to the technical field of electric equipment fault detection, in particular to a dry-type transformer thermal fault diagnosis method and system. Background technique [0002] Transformer is one of the important equipment of power system and plays a particularly important role in power system. Among them, dry-type transformers have the characteristics of flame retardant, safety, convenient maintenance and small size. In recent years, they have been more and more widely used in high-rise buildings and power stations in cities. An important guarantee for system security and reliable power supply. Many typical faults of dry-type transformers will be manifested in the form of heat generation. Therefore, it is particularly necessary to diagnose transformer faults by monitoring the temperature distribution of dry-type transformers. [0003] Accurately obtaining the temperature field of the transformer is not easy. The widely used therm...

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Problems solved by technology

In the application of extension theory for analysis, the determination of the weight function generally adopts the empirical method, and there is some subjectivity in calculating the weight, which cannot objectively reflect the actual situation, and affects the accuracy of various typical fault diagnosis in dry-type transformer thermal fault diagnosis. sex

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