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Analyses on Measurement and Simulation of Electromagnetic Environment of 10 kV/0.4 kV Box Type Transformer by Using FEM Method
DOI: 10.12677/JEE.2017.54030, PDF, HTML, XML, 下载: 1,331  浏览: 2,039  国家自然科学基金支持

Abstract: With the rapid development of Chinese city modernization and the constant updating of city dis-tribution network, box type transformer has been widely used in residential, commercial center, airport, enterprises, hospitals or schools and other places, closed to people’s daily lives. In order to clear the electromagnetic radiation distribution characteristics of box type transformer, this paper selected the 10 kV/0.4 kV box type transformer in a certain area by using the FEM simula-tion and then compared it with the measurement data, in order to study the power frequency electromagnetic distribution characteristics and provide theoretical and experimental basis for assessing the electromagnetic environment level of box type transformer. The result of simulation analysis is in a good agreement with the actual monitoring data. In the actual operation condition of box type transformer, the electric field strength is more than 1.0 V/m and the maximum magnetic flux density is 10 μT at the distance of 20 cm away from box, which mainly concentrate in the import line, the gap and windows and decrease with the increase of the distance. Thus, it can be concluded that the electromagnetic environment level is far below the recommended China residential environmental standard limits, in which the electric field strength is 4 kV/m and the magnetic induction intensity is 100 μT. And it could not cause adverse effects on the surrounding environment, residents' life and physical and mental health.

1. 引言

2. 工频电磁场物理基础

$\nabla ×H=J+\frac{\partial D}{\partial t}$ (1)

$\nabla ×E=-\frac{\partial B}{\partial t}$ (2)

$\nabla \cdot B=0$ (3)

$\nabla \cdot D=\rho$ (4)

3. 有限元仿真模型的建立

3.1. 工程电磁场的有限元方法

3.2. 10 kV/0.4 kV变压器模型参数

3.3. 箱式变电站仿真模型

3.4. 电气仿真设置

3.5. 有限元网格剖分

4. 仿真分析

4.1. 电场场仿真结果

4.2. 磁场仿真结果

Figure 1. Simulation model diagram

Figure 2. Model mesh gridding

Figure 3. Electric field intensity nephogram. (a) XOZ plane = 1600 mm; (b) Whole

Figure 4. Magnetic flux intensity nephogram. (a) XOZ plane = 1600 mm; (b) Whole

5. 测量验证及讨论分析

Figure 5. Measurement curve of electric field strength

Figure 6. Measurement curve of magnetic field strength

Figure 7. Comparison of simulation and test values of electric field strength

6. 结论

Figure 8. Comparison of simulation and test values of magnetic field strength

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