Method for diagnosing fault of power transformer on the basis of interval mathematical theory

Abstract

Aiming at better describing the statistical dispersion characteristics of boundary points, the invention relates to a more practical, popular and adaptive method for more accurately diagnosing the fault of a power transformer on the basis of the interval mathematical theory, belonging to the field of the main power equipment fault diagnosis technology. The following technical schemes are adopted in the invention: (1) a syringe with good air tightness is adopted for injecting the oil sample; (2) after the gases in the collected oil sample are subjected to ultrasonic and vacuum removal and separation in an oil-gas separating room, the components and the content of the gases are analyzed with a gas chromatograph; (3) three contrast values on the components of the five characteristic gas are formed through calculation and are represented with different codes; (4) the maximum three contrast values on the content of the five characteristic gas, which is measured in a plurality of experiments, are extracted to form the interval numbers of the three contrast values; and (5) the corresponding type and nature of the fault of the power transformer are determined. The method is mainly used for diagnosing the fault of the power transformer.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of power main equipment, in particular to a fault diagnosis method for power transformers based on interval mathematical theory. technical background [0002] Fault diagnosis of power transformers has been widely valued by academia and engineering circles. Comprehensive fault diagnosis of oil-immersed power transformers based on artificial intelligence technologies such as expert systems, fuzzy theory, and neural networks has been widely studied, but these methods often require a large amount of statistical information and prior knowledge, so the calculation and training are complicated. The complexity of actual transformer faults and the harsh operating environment have resulted in incomplete fault knowledge or lack of detection information, making them unsatisfactory in terms of diagnostic ability, applicability and knowledge acquisition, and there are certain problems in actual use. Tr...

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Problems solved by technology

When the gas ratio is near the boundary point, a small change in the data is likely to cause a large change in the code, resulting in misjudgment of the type of insulation fault

Due to the complex relationship between the fault form and the fault type and the ambiguity of the fault classification, the three-ratio method is often incompetent, especially at the boundary of the coding, the ambiguity increases, and the error of the three-ratio method also increases

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