| Summary: | 碩士 === 中原大學 === 工業與系統工程研究所 === 103 === 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 triangular-step, rectangular-step, oval-step, butt-lap -step and half mitre-lap-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 vibration.
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