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In-operation power transformer short circuit resisting ability comprehensive evaluation method

A technology of anti-short circuit capability and power transformer, which is applied in the direction of measuring electrical variables, instruments, and measuring electricity, etc. It can solve the problems that the anti-short circuit ability does not consider the operation situation and cycle pre-test situation, and does not give evaluation ideas and methods.

Inactive Publication Date: 2019-04-05
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a comprehensive evaluation method for the short-circuit resistance capability of power transformers in operation, so as to solve the existing problems in the comprehensive evaluation of the short-circuit resistance capability of power transformers in operation without considering the actual operation conditions and periodic pre-test conditions. Influencing factors, when it is difficult to obtain structural parameters for old transformers in operation, technical issues such as evaluation ideas and methods are not given

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  • In-operation power transformer short circuit resisting ability comprehensive evaluation method
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  • In-operation power transformer short circuit resisting ability comprehensive evaluation method

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Embodiment Construction

[0030] The present invention analyzes the influencing factors of the short-circuit resistance capability of power transformers, and establishes a basic framework for comprehensive evaluation of the short-circuit resistance capability of transformers in operation from three aspects: short-circuit check, system operation and test conditions, as follows: figure 1 .

[0031] Strength Check of Transformer with Structural Parameters

[0032] Firstly, through the TOK verification software, the transformer short-circuit current is accurately calculated, and then the result is combined with the system capacity or system impedance to calculate the steady-state short-circuit current and asymmetrical short-circuit current under each tap condition. Then, the transformer is modeled as a whole, and all transformers are considered as an elastic system. Secondly, use YOKEBEAM software to calculate the stiffness coefficient of pressure nails, body pads, pressure plates, support plates and othe...

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Abstract

The invention discloses an in-operation power transformer short circuit resisting ability comprehensive evaluation method. The method comprises the following steps: 1, evaluating an operation condition: evaluating in-operation transformer winding short circuit resisting ability accumulative effect from four factors including operation life limit, short circuit impact duration, short circuit impacttimes and short circuit impact current size; 2, winding deformation related test evaluation: evaluating transformer winding deformation condition through a low voltage impedance method, a frequency response method and an inter-winding capacitance measurement method; 3, checking in-operation transformer short circuit resisting ability; 4, performing comprehensive analysis according to evaluation results of the steps 1-3. The method provided by the invention solves technical problems in the prior art, for example, in the prior art, in the in-operation power transformer short circuit resisting ability comprehensive evaluation, actual operation conditions and periodic preset condition influence factors are not considered, when an in-operation old transformer cannot obtain structure parameters, evaluation thoughts and methods are not given.

Description

Technical field: [0001] The invention belongs to the field of safe operation and accident prevention of power transformers in electric power systems, and in particular relates to a comprehensive evaluation method for short-circuit resistance capability of power transformers in operation. Background technique: [0002] In the case of a sudden short circuit in a power transformer, a huge short circuit force will be generated in the winding, so the short circuit resistance of the transformer is particularly important. If the design or technological measures of the transformer are not perfect, and the short-circuit resistance capability is not enough, the winding insulation and structural parts will be damaged, which will affect the insulation performance of the transformer. A short circuit causes the winding to burn out. If a large power transformer is damaged by a short circuit when the system is running, it will cause a large-scale power outage, and the maintenance period wi...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 刘君曽华荣吴湘黔许逵陈沛龙曾鹏邢懿杨涛黄军凯文屹张迅赵超
Owner GUIZHOU POWER GRID CO LTD
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