Outline
- I. Introduction
- II. Power Losses in Transformer
- III. Surface Impedance
- IV. 3d Model of Power Transformer
- V. Results
رئوس مطالب
- چکیده
- کلیدواژه ها
- 1. مقدمه
- 2. تلفات انرژی در ترانسفورماتور
- 3. امپدانس سطح
- الف. امپدانس سطح خطی
- ب. آمپدانس سطح غیر خطی
- 4. مدل سه بعدی ترانسفورماتور قدرت
- 5. نتایج
- 6. نتیجه گیری
- منابع
Abstract
The article discusses the eddy current losses generated in a transformer tank walls and other electrically conductive construction parts. The losses are related to the magnetic leakage fields. A time harmonic 3D finite element method is used to compute the magnetic leakage field in the case of nominal load condition of the power transformer. The indirect measuring procedure based on the short circuit method was carried out on many different power transformer designs to validate the simulation results.
Keywords: eddy current losses - Finite element method - Power transformer - stray losses - surface impedanceConclusions
From the treated cases of different power transformer designs can be deduced that the eddy current losses in tank walls and other construction parts can be quite accurately calculated.
Accuracy of calculations can be mainly ascribed to mathematical simplifications and to material’s nonlinear magnetic properties description. The results show the difference in eddy current losses using linear and non-linear surface impedance. This comparison was done to drawl the attention on inexactness of using linear surface impedance in such calculus.
It should be pointed out that in spite of inaccurate calculations regarding absolute values we have a method to define the best position of clamps and crossbars to achieve minimum losses. The impact of material properties on overall losses in power transformer construction parts can be also studied applying presented method.