Method for nonlinear simulation of short circuits inside transformer

An internal short-circuit and transformer technology, applied in the field of power system, can solve the problem of inaccurate short-circuit fault simulation model

Inactive Publication Date: 2016-12-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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Problems solved by technology

[0005] In view of the inaccuracy of the simulation model considering the internal short-circuit fault of the transformer in the prior art, it is necessary to consider the saturation characteristics of ferromagnetism in the internal fault model of the transformer

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  • Method for nonlinear simulation of short circuits inside transformer
  • Method for nonlinear simulation of short circuits inside transformer

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Embodiment Construction

[0014] The present invention comprises the following steps:

[0015] 1. Finite element calculation principle of transformer electromagnetic field

[0016] The finite element method is a method used to solve boundary value problems in mathematical physics. At present, the wide application of finite element method in electrical engineering has established its indisputable dominant position in the field of solving electromagnetic distribution boundary value problems. . The finite element method actually divides the solution area into several small areas, and then sums the results of each small area to obtain the solution of the entire area. After the whole area is divided into small areas, the solution becomes very simple, only some algebraic operations, such as the application of linear difference, can get the value of unknown points in the small area, and the sum of small areas can replace the area integral.

[0017] The main process of ANSYS electromagnetic field analysis is...

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Abstract

The invention belongs to the technical field of electric systems, and particularly relates to a method for nonlinear simulation of short circuits inside a transformer. According to the method, ferromagnetic saturation characteristics need to be considered in a transformer internal fault model due to the fact that a transformer internal short circuit fault simulation model is not accurate enough in the prior art. Work is started for solving some key unsolved problems in the transformer internal fault simulation model, firstly, a corresponding finite element analytical model is built, a transformer coil inductance matrix is obtained through an energy disturbance method, then, the model is utilized, and transformer inductance parameters on the condition of winding inductance nonlinearity caused by iron core saturation are considered. Finally, whether the precision is improved or not can be verified by comparing the parameters with a previously calculated linear inductance matrix.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method for considering a nonlinear simulation of a short-circuit fault inside a transformer. Background technique [0002] Transformer is one of the complex components in the power system that is difficult to be accurately modeled. To accurately establish the model of the transformer under various operating conditions must be based on the data of its electromagnetic characteristics. Since practical transformers and their accessory devices store or dissipate small amounts of energy, to fully describe a practical transformer, the following four important characteristics of a transformer are essential: copper loss due to winding resistance, The iron loss caused by the hysteresis effect, the leakage flux around the winding and the magnetization characteristics of the iron core. The impact of the above four points on the transformer is very important, and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 马瑞刘翼
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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