Method for calculating service life of transformer under various time varying stress effects

A technology of stress action and calculation method, which is applied in calculation, special data processing applications, instruments, etc., can solve the problems of inability to fully reflect the actual situation of transformers, low reliability of transformer life, and no good methods

Active Publication Date: 2013-09-25
TSINGHUA UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no good method for calculating the life of such a transformer when it is subjected to multiple time-varying stresses.
In addition, there is no reasonable method for the life loss of the transformer when it is subjected to time-varying random stress.
Therefore, the existing calculation method of transformer service life cannot fully reflect the actual situation of transformer operation, and the reliability of the estimated transformer life is low.

Method used

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  • Method for calculating service life of transformer under various time varying stress effects
  • Method for calculating service life of transformer under various time varying stress effects
  • Method for calculating service life of transformer under various time varying stress effects

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Embodiment Construction

[0031] The calculation method for the service life of the transformer under the action of various time-varying stresses proposed by the present invention comprises the following steps:

[0032] (1) When the transformer is initialized, the time T=0 and the life loss D=0;

[0033] (2) Obtain the continuous stress suffered by the transformer during the operating time period t. The continuous stress includes thermal stress, electrical stress and mechanical stress, and divides the time period t into n unit time periods t Δ , denoted as t 1 ,t 2 ...t n , where the thermal stress is measured by the first hot spot temperature θ 1 ,θ 2 …, θ n Indicates that the electrical stress is expressed as the first field strength E1 ,E 2 …E n Indicates that the mechanical stress is represented by the first mechanical stress M 1 , M 2 ..., M n express;

[0034] Obtain the random stress suffered by the transformer during the operating time period t. The random stress includes overload im...

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Abstract

The invention relates to a method for calculating service life of a transformer under various time varying stress effects and belongs to the technical field of electric devices. According to a linear cumulative damage law, accumulation effects of various types of time varying stress including heat stress, electric stress, mechanical stress, random stress and the like on the transformer are considered, a small period is utilized as a calculation unit, stress values in different periods can be different, and the stress time varying performance is considered. Effects of different types of stress on the transformer are measured in a unified mode according to the idea of service life consumption, comprehensive effects of various types of stress are considered on the basis, a result of the service life of the transformer and obtained by calculation is more accurate and meets the actual condition, and the method has guiding significance on an engineering application.

Description

technical field [0001] The invention relates to a calculation method for the service life of a transformer under the action of various time-varying stresses, and belongs to the technical field of electrical equipment. Background technique [0002] Transformers are subjected to multiple stresses during use, and components are gradually worn out and aged. In order to calculate the transformer life accurately and comprehensively, it is necessary to consider the comprehensive effects of various stresses. Stress can be divided into continuous stress and random stress according to the working conditions generated. Sustained stress refers to the stress suffered by the transformer under normal working conditions. Sustained stress is continuously time-varying and often accompanies the transformer throughout its life. Random stress refers to the stress suffered by the transformer under bad working conditions. Random stress occurs at random times. of. Sustained stress can be further...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01R31/00
Inventor 白翠粉高文胜刘通马仪
Owner TSINGHUA UNIV
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