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A Calculation Method of Transformer Short Circuit Impulse Cumulative Effect

A technology of short-circuit impact and calculation method, which is applied in the direction of transformer testing, etc., can solve the problems of difficult to obtain accurate parameters and poor practicability, and achieve the effect of small amount of data and easy data acquisition

Active Publication Date: 2022-01-18
STATE GRID TIANJIN ELECTRIC POWER +1
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Problems solved by technology

[0003] The existing short-circuit impact cumulative effect analysis methods are mainly finite element analysis methods. This method needs to accurately model the transformer after short-circuit, and the required parameters are often difficult to obtain accurately, so it is not practical in actual production.

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  • A Calculation Method of Transformer Short Circuit Impulse Cumulative Effect
  • A Calculation Method of Transformer Short Circuit Impulse Cumulative Effect
  • A Calculation Method of Transformer Short Circuit Impulse Cumulative Effect

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0030] A method for calculating the cumulative effect of transformer short-circuit impact, the steps are as follows:

[0031] (1) Collect the main parameters of the transformer to be analyzed and the maximum short-circuit current value I' that each side can withstand K

[0032] I' K The maximum short-circuit current that the transformer winding can withstand is obtained by checking the transformer design scheme, which is generally provided by the transformer manufacturer.

[0033] (2) Calculate the maximum allowable short-circuit current I of this transformer k

[0034] For a intact transformer that has not been subjected to short-circuit impact, the effective value of the AC symmetrical componen...

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Abstract

The present invention relates to a method for calculating the cumulative effect of transformer short-circuit impact, the steps are as follows: (1) Collect the main parameters of the transformer to be analyzed and the maximum short-circuit current value I' that each side can withstand K (2) Calculate the maximum allowable short-circuit current I of this transformer k (3) Collect the data of each short-circuit impact in the whole life cycle of the transformer (4) Calculate the degree of risk d caused by the size of the i-th short-circuit current i_n (5) Calculating the degree of danger d caused by the duration of the short circuit i_t (6) Calculate the degree of danger d caused by this short circuit i (7) Calculate the cumulative risk D of short-circuit impact. The present invention can quantitatively calculate the impact of short-circuit current magnitude and short-circuit duration on the deformation risk of transformer windings on the basis of obtaining short-circuit impact data in the whole life cycle of the transformer.

Description

technical field [0001] The invention belongs to the field of transformer operation state analysis, in particular to a method for calculating the accumulative effect of transformer short-circuit impact. Background technique [0002] According to the statistical data of transformer faults of State Grid Corporation of China in the past 10 years, insufficient short-circuit resistance is the primary cause of transformer faults, accounting for 35.7%. After studying a large number of transformer winding deformation faults, it is found that the last short-circuit impact that causes winding deformation is often not very serious, but due to the previous short-circuit impact, the small deformation of the winding continues to accumulate, eventually leading to serious deformation. Therefore, it is of great practical significance to accurately evaluate the transformer state after short-circuit impact and prevent the risk of winding deformation caused by cumulative effect for improving the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/62
Inventor 张鑫王伟张弛郗晓光梁海深马昊刘力卿王旭强段明辉吴永良李明袁贺超王晓彤牛荣杰李云秀
Owner STATE GRID TIANJIN ELECTRIC POWER