有限元素法於單相亭置式變壓器多階式鐵心電磁結構之研究

本研究提出單相亭置式變壓器多階式鐵心結構電磁分析，旨在針兩鐵心損失和及振動關係進行研究。當鐵心受到激磁時所產生的磁力線，它將會通鐵心的搭接磁阻，並將影響鐵心磁通密度的變化。基本上，軟磁性材料矽鋼片鐵心磁滯伸縮變化特性，將影響其內部磁通密度分佈情形。本研提出不同鐵心搭接結構以及複合式鐵心結構等，分析其磁通密度、磁滯伸縮力、鐵心損失及振動等相關聯特性。鐵心疊積長度、氣隙孔不同的距離以及氣隙孔分佈都是影響損耗的關鍵因素。首先，本研究建立變壓器的幾何模型，再將模型帶入Ansoft Maxwell 3D有限元素法進行電磁分析。本實驗搭接組數包含六階、七階、八階以及九階等，乃透過有限元素法進行電磁特性模擬，可觀察不同搭接數量其磁特性變化。實驗結果證實，搭接組數愈高磁特性較佳，另外，本研究提出複合式鐵心亦能有效降低鐵心振動。

關鍵字

有限元素法；鐵心損失；氣隙；振動

並列摘要

This dissertation proposes experimental results for single-phase pad-mounted transformer in electromagnetic study with different multi-step lap joint core structure which is analyzed the magnetism priorities including core loss and vibration. When the transformer core was excited during power rating, the magnetic flux line has passed through the magnetic reluctance of the core, which effect of magnetic flux density on core insides, has been occurred. Basically, soft magnetic silicon steel material characteristic dependent on magnetostriction variation, which is affected to the internal core of magnetic flux density distribution. This dissertation is proposed correlation of multi-step lap’s core joint structures on single-phase distribution transformer, including magnetic flux density, magnetostrictive force, core loss and vibration, respectively. Core laminating length, air-gapped distance of core as well as air-gapped distribution, will be indispensable key point of magnetism characteristic. Firstly, this study presents a geometry model for multi-step lap core. Then, it also established Ansoft Maxwell 3D by using finite element method to analyze the electromagnetic model for each different core structures. Secondly, experimental approach for different core structure, including sixth-step, seventh-step, eighth-step and ninth-step, is used the finite element analysis to simulate electromagnetic properties which is observed different core joint structure dependent on each magnetic variation. It is indicated that a better core property with different joint structure has significantly validated. Consequently, for composited-core structure, is also has shown the results in lower magnetic loss, vibration.

並列關鍵字

Core losses ； Vibration ； Finite element method ； Air gap

參考文獻

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[7]I. Hernández, F. de León, J. M. Cañedo and J. C. Olivares-Galván, ”Modelling transformer core joints using gaussian models for the magnetic flux density and permeability” IET Electric Power Applications, Volume 4, issue 9, 2010, pp. 761 - 771

國際替代計量

有限元素法於單相亭置式變壓器多階式鐵心電磁結構之研究

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