Research on simulation calculation on short-circuit electrodynamics force of power transformer winding

被引:3
|
作者
Shan, Yi [1 ]
Ai, Mengmeng [1 ]
Liu, Wenhui [2 ]
机构
[1] Harbin Univ Sci & Technol, Coll Elect & Elect Engn, Harbin 150080, Heilongjiang, Peoples R China
[2] Jiamusi Elect Machinery Co Ltd, Jiamusi, Peoples R China
关键词
DC power transformer; field-circuit coupling; short-circuit electrodynamics force; winding mechanical strength; FINITE-ELEMENT-ANALYSIS; ELECTROMAGNETIC FORCE; HTS TRANSFORMER; INRUSH CURRENT; FIELD;
D O I
10.3233/JAE-200021
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The safety and reliable operation of power grid is directly related to the ability of power transformer to withstand short-circuit, therefore, it is a problem to be solved to improve the ability of large power transformer windings to withstand short-circuit. Taking a three-phase five-limb power transformer as an example, the transient electromagnetic field, short-circuit electrodynamics force of windings and mechanical strength of coils are analyzed in depth. Firstly, the three-dimensional finite element model of the prototype is established, and the magnetic flux density distribution of the three-dimensional transient electromagnetic field of transformer under short-circuit operation and the axial and radial static force magnitude of the winding are calculated by using the field-circuit coupling method, and the distribution law can be obtained. At the same time, the mechanical strength of power transformer winding in its height direction is discussed, and the modal vibration mathematical model of transformer low-voltage winding in Z-axis direction is established. The displacement change and resonance frequency of the winding wire cake in the axial direction caused by short-circuit are calculated, and the short-circuit electrodynamics force of the winding is also checked. The research in this paper provides a theoretical basis for strengthening the design of short-circuit withstanding capacity of windings, and has a certain theoretical and engineering application value.
引用
收藏
页码:451 / 465
页数:15
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