变压器在谐波条件下的损耗及热问题分析
发布时间：2018-09-04 20:47
【摘要】：谐波是影响电能质量的稳态扰动之一。现代电力系统中，，电力电子技术的发展、电气化铁路的发展以及工业电器的大量使用使得注入电网的谐波日益增多，对电能质量产生严重危害。变压器在电力系统中占有重要地位。目前，变压器在电力工程的各个领域中获得了广泛的应用，由于技术上与经济上的原因，变压器的单台容量越来越大，因此变压器的损耗及热点、温升更加引起人们的注意。电力系统的谐波会使变压器铜损和杂散损耗增加，外壳、外层硅钢片和某些紧固件发热，还会造成变压器噪声增大、降低变压器额定容量、降低设备寿命及可靠性等。因此研究谐波对变压器损耗及温升的影响具有重要的现实意义。 本文分析了谐波在变压器中产生的磁滞损耗、绕组损耗及涡流损耗等，应用变压器电磁场理论以及有限元分析理论，通过建立变压器三维模型，进行变压器的漏磁场分析，对变压器铁芯、绕组的磁场分布、谐波损耗及温升进行计算分析，得出变压器损耗及温升与谐波次数的关系，铁芯主通道轴向磁场密度分布情况，绕组及铁芯的热点分布情况等，这对于减少变压器损耗、延长变压器使用寿命、保障电力系统安全稳定运行具有重要意义。
[Abstract]:Harmonic is one of the steady-state disturbances affecting power quality. In modern power system, with the development of power electronics technology, the development of electrified railway and the extensive use of industrial electrical appliances, the harmonics injected into the power network are increasing day by day, which causes serious harm to the power quality. Transformer plays an important role in power system. At present, transformer has been widely used in various fields of power engineering. Because of technical and economic reasons, the single unit capacity of transformer is becoming larger and larger, so the loss and hot spot of transformer and temperature rise have attracted more and more attention. The harmonics of power system will increase the copper loss and stray loss of transformer, heat the shell, outer silicon steel sheet and some fasteners, increase the noise of transformer, reduce the rated capacity of transformer, reduce the life and reliability of equipment, etc. Therefore, it is of great practical significance to study the influence of harmonics on transformer loss and temperature rise. In this paper, the hysteresis loss, winding loss and eddy current loss caused by harmonics in the transformer are analyzed. By using the theory of transformer electromagnetic field and the finite element analysis theory, the leakage magnetic field of the transformer is analyzed by establishing the three dimensional model of the transformer. The magnetic field distribution, harmonic loss and temperature rise of transformer core and winding are calculated and analyzed. The relationship between transformer loss and temperature rise and harmonic frequency, the distribution of axial magnetic field density in main channel of iron core is obtained. The distribution of hot spots in windings and cores is of great significance for reducing transformer losses, prolonging transformer service life and ensuring the safe and stable operation of power system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM406
本文编号：2223286
[Abstract]:Harmonic is one of the steady-state disturbances affecting power quality. In modern power system, with the development of power electronics technology, the development of electrified railway and the extensive use of industrial electrical appliances, the harmonics injected into the power network are increasing day by day, which causes serious harm to the power quality. Transformer plays an important role in power system. At present, transformer has been widely used in various fields of power engineering. Because of technical and economic reasons, the single unit capacity of transformer is becoming larger and larger, so the loss and hot spot of transformer and temperature rise have attracted more and more attention. The harmonics of power system will increase the copper loss and stray loss of transformer, heat the shell, outer silicon steel sheet and some fasteners, increase the noise of transformer, reduce the rated capacity of transformer, reduce the life and reliability of equipment, etc. Therefore, it is of great practical significance to study the influence of harmonics on transformer loss and temperature rise. In this paper, the hysteresis loss, winding loss and eddy current loss caused by harmonics in the transformer are analyzed. By using the theory of transformer electromagnetic field and the finite element analysis theory, the leakage magnetic field of the transformer is analyzed by establishing the three dimensional model of the transformer. The magnetic field distribution, harmonic loss and temperature rise of transformer core and winding are calculated and analyzed. The relationship between transformer loss and temperature rise and harmonic frequency, the distribution of axial magnetic field density in main channel of iron core is obtained. The distribution of hot spots in windings and cores is of great significance for reducing transformer losses, prolonging transformer service life and ensuring the safe and stable operation of power system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM406
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