Multiattribute comprehensive method for structural fault diagnosis of transformer

A technology of fault diagnosis and comprehensive method, applied in the direction of instrument, calculation, electrical digital data processing, etc., can solve the problem of difficult to accurately reflect the structural fault of the transformer

Active Publication Date: 2016-04-13
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a multi-attribute comprehensive method for structural fault diagnosis of transformers based on multiple detection methods to solve the problem that a single detection method is difficult to accurately reflect the structural faults of transformers, and to improve the accuracy of structural fault diagnosis of transformers. reliability

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  • Multiattribute comprehensive method for structural fault diagnosis of transformer
  • Multiattribute comprehensive method for structural fault diagnosis of transformer
  • Multiattribute comprehensive method for structural fault diagnosis of transformer

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Embodiment Construction

[0071] In order to make the object, technical solution and advantages of the present invention clearer, the specific implementation methods of the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0072] A set of typical test data is selected as a calculation example, and the short-circuit impedance method (denoted as SCI), the frequency response method (denoted as FRA) and the capacitance method (denoted as C) are used respectively. The 7 possible states that define a transformer are:

[0073] H={H 1 , H 2 , H 3 , H 4 , H 5 , H 6 , H 7}={Normal, turn-to-turn short circuit, clamp loss of pressure, axial displacement, poor grounding of the casing, residual magnetism, winding warpage}

[0074] (1) Judging by the short-circuit impedance method. Through vertical comparison with historical test data, it is jud...

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Abstract

The invention discloses a multiattribute comprehensive method for structural fault diagnosis of a transformer based on various detection methods. A multiattribute diagnosis model with two-stage structures is built; comprehensive diagnosis is carried out through various detection methods, such as a short circuit impedance method, a frequency response method and a capacitance method. Possible states of the transformer are described through grades. An analytic hierarchy process is introduced to calculate every detection method and the weight coefficients of corresponding criteria. On the basis of the evidential reasoning theory, the comprehensive diagnosis is carried out to the conclusions obtained through the various detection methods; the possible states of the transformer are represented in a probability form. According to the invention, the structural fault diagnosis problem of the transformer under conditions that the original data are missed and various judging conclusions are at variance is solved; the real state of the power transformer can be judged accurately; and the subject factor influence is reduced.

Description

technical field [0001] The invention belongs to a transformer structural fault diagnosis method, and more specifically relates to a multi-attribute comprehensive method for transformer structural fault diagnosis based on multiple detection means. Background technique [0002] Structural failure is one of the main causes of power transformer damage accidents. Structural fault diagnosis of the transformer after transportation or short-circuit impact can ensure the safe and stable operation of the transformer. At present, the commonly used off-line detection methods for transformer structural faults mainly include frequency response analysis (Frequency Response Analysis, FRA), short circuit impedance method (Short Circuit Impedance Method, SCI) and capacitance method (Capacitance Method, C). A large number of field tests have shown that due to the limitations of field measurement accuracy, original comparable data and fault diagnosis criteria, it is difficult to accurately ref...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/00
Inventor 鲁非史天如金雷周凯刘思维刘毅李化林福昌
Owner STATE GRID CORP OF CHINA
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