Oil-immersed transformer fault diagnosis method based on fault probability distribution model

An oil-immersed transformer, a technology of failure probability, applied in the direction of instruments, special data processing applications, electrical digital data processing, etc.

Inactive Publication Date: 2014-04-23
ZHEJIANG UNIV +1
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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems existing in the prior art, the present invention provides a fault diagnosis method for oil-immersed transformers based on a fault probability model, which introduces probability into the char

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  • Oil-immersed transformer fault diagnosis method based on fault probability distribution model
  • Oil-immersed transformer fault diagnosis method based on fault probability distribution model
  • Oil-immersed transformer fault diagnosis method based on fault probability distribution model

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Embodiment Construction

[0034] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035]A fault diagnosis method for an oil-immersed transformer based on a fault probability model, comprising the following steps:

[0036] Step (1): Collect a large number of data information of dissolved gas in transformer oil with known faults, select the H dissolved in the oil 2 、CH 4 、C 2 h 6 、C 2 h 4 、C 2 h 2 The gas content is normalized as a characteristic parameter to form a large number of data samples composed of characteristic parameters and fault types. Referring to IEC 60599, transformer fault types can be divided into six types: low temperature overheating T1 (below 300°C), medium temperature overheating T2 (above 300°C and below 700°C), high temperature overheating T3 (above 700°C ), partial discharge PD, low energy discharge D1, h...

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Abstract

The invention discloses an oil-immersed transformer fault diagnosis method based on a fault probability distribution model, aiming to provide the probability of various faults of the oil-immersed transformer according to analysis of dissolved gas in oil. The oil-immersed transformer fault diagnosis method includes the steps of collecting massive analysis data of the dissolved gas in the oil of the transformer and normalizing the data, utilizing a Sigmoid function to realize probability output on the basis of a support vector machine, computing according to the collected massive analysis data of the dissolved gas in the oil to acquire optimal parameters of the support vector machine and the Sigmoid function, fusing the probability output of multiple support vector machines into probability output of multi-class problems, and obtaining a diagnosis result by referring to the maximum probability classification and standard deviation. The oil-immersed transformer fault diagnosis method based on the fault probability distribution model has high accuracy without error diagnosis, can be used for processing multiple fault conditions effectively and has high practicability.

Description

technical field [0001] The invention belongs to the technical field of electric equipment fault diagnosis, and in particular relates to a fault diagnosis method for an oil-immersed transformer based on a fault probability model. Background technique [0002] In the power system, the power transformer is responsible for the voltage change between the grids and the function of electric energy conversion, and is one of the most important equipment in the power system. On the one hand, the failure of the transformer during operation will cause damage or damage to the equipment itself, causing power outages to the users; on the other hand, it may also cause system accidents, which are even more harmful. With the continuous development of computer technology, intelligent technology and sensor technology, various intelligent fault diagnosis technologies have begun to be applied to the fault diagnosis of power transformers, becoming a convenient and effective means of transformer fa...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 郭创新鹿鸣明罗学礼曹敏张行
Owner ZHEJIANG UNIV
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