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Dynamic correction method for reliability assessment of large-sized oil-immersed power transformer

A power transformer, dynamic correction technology, applied in the direction of instruments, electrical digital data processing, special data processing applications, etc., can solve problems such as acquisition difficulties

Inactive Publication Date: 2017-11-07
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art, especially for the problem that it is difficult to obtain the degree of polymerization, furfural volume fraction, etc. A dynamic correction method for reliability assessment of large oil-immersed power transformers

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  • Dynamic correction method for reliability assessment of large-sized oil-immersed power transformer
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  • Dynamic correction method for reliability assessment of large-sized oil-immersed power transformer

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Embodiment Construction

[0079] In order to better understand the present invention, the present invention will be further described below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0080] Such as figure 1 Shown is an overall structure diagram of a dynamic correction method for reliability assessment of large oil-immersed power transformers. The reliability assessment model provided by the present invention adopts the framework of mutual cooperation between the original reliability assessment model and the gray correction model, wherein the original reliability assessment model takes HST calculation as the core, and the gray correction model takes DGA gray target correction as the core.

[0081] Such as figure 2 The flow chart of specific implementation steps of a dynamic correction method for reliability evaluation of large oil-immersed power transformers is shown, including two processes: the first process and...

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Abstract

The invention discloses a dynamic correction method for reliability assessment of a large-sized oil-immersed power transformer; a transformer oil-paper insulating system is used as an assessment object, and two processes are involved; in the first process, with hotspot temperature calculation as the core, an HST-based (hotspot temperature) transformer aging fault model is established in conjunction with Weibull distribution and Arrhenius reaction law, winding HST is acquired by calculating, and fault rate gamma of the transformer oil-paper insulating system is solved; in the second process, with gray target correction analysis via dissolved gas in oil as the core, a relationship between transformer health state and its predicted life is established via grey theory, equivalent HST value is obtained, dynamic correction is provided for the basic model in the first process, and it is ensured that the assessment value is capable of well tracing and reflecting actual reliability level of the transformer. By using the method, it is possible to effectively solve the problems that, for instance, a transformer reliability analysis model has low accuracy and is difficult to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of reliability evaluation of power system transformers, in particular to a dynamic correction method for reliability evaluation of large oil-immersed power transformers. This method is suitable for reliability assessment of power transformers. Background technique [0002] As the key equipment of the power system, the large oil-immersed power transformer is directly related to the safety and stability of the power system. Therefore, an accurate assessment of its reliability level is an important guarantee for the safe and stable operation of the power grid. With the vigorous development of energy Internet technology and the "Internet +" proposed by Premier Li Keqiang of the State Council, renewable new energy has received more and more attention and development. The connection of these large amounts of new energy to the power grid will inevitably lead to a large number of harmonic pollution and voltage devi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 程乐峰余涛
Owner SOUTH CHINA UNIV OF TECH
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