變壓器磁場特性分析之研究

The Study of Magnetic Field Characteristics in Transformers

洪啟仁(Chi-Jen Hung)

國立虎尾科技大學/工程學院/動力機械工程研究所/碩士(2005年)

摘要

近年來電力電子設備被廣泛地使用，但是電力電子設備本身為非線性
負載，將會使大量諧波注入電力系統中。諧波會扭曲基本的正弦波波型，
會造成偏高的電流，使得電力品質降低。因此，本論文利用有限元素軟體
來分析變壓器的磁場，並針對不同的諧波源對單相變壓器所造成的影響。
當考慮不同功率因數之負載時，觀察其磁通密度與磁場強度的變化關係，
以便分析功率因數對變壓器的影響。
變壓器在激磁時，由於過載與諧波會造成變壓器鐵芯產生過飽和，導
致變壓器溫升並引起變壓器效率降低。本文將針對下列問題進行分析：(1)
變壓器二次側連接不同之負載，(2)不同的功率因數負載，(3)電源含有諧波
之下。上述問題皆會影響變壓器磁通密度及磁場強度，因此值得需要深入
探討，日後並可作為變壓器設計之重要參考依據。

並列摘要

The power electronic equipments are used widely in recent years, but the
power electronic equipments themself are the non-linear loads. It will introduce
a lot of harmonics waves in the power systems and reduce power quality.
Therefore, this thesis presents use of finite element software to analysis
magnetic field of transformers. Aiming at the influence on single-phase
transformer by harmonic source. When we are considering the loading at
different power factors, based on the observation of the relationship between
magnetic flux density and magnetic field intensity, it can help to analyze the
effects of power factory acting on the transformer.
When a transformer is exciting, because overload and harmonic will cause
the saturation of the transformer, cause the temperature rising of the transformer
and the efficiency of transformer to reduce. This thesis will analysis following
problems : (1) secondary coil of the transformer by different load (2) relation
between the transformer and power factor (3) the influence of the transformer by
harmonic source. This problems cause to effect of magnetic flux density and
magnetic field intensity, therefore, further investigations should be continuous, it
may become an important design parameters of transformer.

參考文獻

and analysis using finite element methods", IEEE Trans. Computation in

Electrostatics, pp.8/1-8/3(1995).

5. V. Darley, "The use of finite element techniques in the design and analysis of

6. E. Schmidt, P. Hamberger and W. Seitlinger, "Finite element calculation of

eddy current losses in the tank wall of power transformers", IEEE