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Dry-type transformer leakage magnetic field and temperature distribution studies

Author: QuDeYu
Tutor: LiuWenLi
School: Harbin University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: Dry-type transformers Temperature field FEM Foil winding Leakage magnetic field
CLC: TM412
Type: Master's thesis
Year: 2011
Downloads: 139
Quote: 1
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Abstract


Cast resin dry type transformer winding foil with fire, moisture, you can load center of advantages, but there are a balance of ampere-turns short circuit capability characteristics, and is widely used in power systems . However, compared with oil-immersed transformer as cooling medium is air, causing it to heat dissipation performance is poor , making the transformer winding temperature distribution inside the uneven impact of the operational life of the transformer , so the dry-type transformer temperature field distribution accurately calculate , it will dry-type transformer thermal design and operating life play a very crucial role. This paper established a foil winding dry-type transformer model, based on the structural model of the transformer , combined with the magnetic field theory, using the finite element method to establish a foil winding dry-type transformer leakage magnetic field mathematical model, using this model to simulate the transformer in the quasi-stationary field the leakage magnetic distribution , and calculate the horizontal and vertical leakage transformer flux density , according to the calculated flux density to calculate the transformer winding eddy current losses . To thereby obtain a distribution transformer winding eddy calculated winding plus loss and total loss. In calculating the overall loss of the winding , according to heat transfer and fluid mechanics , the establishment of two-dimensional fluid field and temperature field of finite element equations , the calculated loss as a heat source to the load on the transformer winding , using the method of fluid-structure interaction , the fluid crossover operator parameters and temperature parameters , the temperature distribution of the transformer windings . Meanwhile hotspot location and get the hottest temperatures. This article and the experimental results with theoretical principles of the leakage magnetic field simulation , the eddy current loss and temperature distribution are compared , the results obtained prove that this situation relatively close to the measured , using the method is feasible for transformer thermal design and provide the basis for forecasting hotspots .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Power transformers > Dry type power transformers
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