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

A technology of power transformers and interval mathematics, which is applied in the field of fault diagnosis of power transformers based on interval mathematics theory, can solve the problems of increased error of the three-ratio method, incompetence of the three-ratio method, and increased ambiguity.

Inactive Publication Date: 2010-04-07
TIANJIN UNIV
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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 fo...

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

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Embodiment Construction

[0024] Table 1 and Table 2 are respectively the fault type judgment method of the three-ratio method and the encoding rule list of the three-ratio method using intervals instead of points in the present invention.

[0025] Table 1 Judgment method of fault type by three-ratio method

[0026]

[0027] Table 2 Coding rules of the three-ratio method using intervals instead of points

[0028]

[0029] The present invention will be further described below by taking the fault diagnosis of the main transformer of a substation as an example.

[0030] 1. Data Collection

[0031] Such as figure 1 As shown in the system flow chart, a syringe with good airtightness is used to collect transformer oil samples in time. The collected oil samples are separated by ultrasonic and vacuum degassing in the oil-gas separation chamber, and the faulty gas is injected into the chromatographic analyzer for component analysis. and content analysis, the analysis objects are hydrogen, methane, etha...

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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...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01N30/02
Inventor 王守相陈秀丽王成山王慧
Owner TIANJIN UNIV
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