励磁突入電流および残留磁束の解析を目的とした変圧器励磁回路モデルの開発

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  • Development of a Transformer Magnetizing Circuit Model for Inrush Current and Residual Flux Calculations
  • レイジトツニュウ デンリュウ オヨビ ザンリュウジソク ノ カイセキ オ モクテキ ト シタ ヘンアツキレイジカイロ モデル ノ カイハツ

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説明

For accurate simulations of transformer inrush currents, modeling of magnetizing circuits which represent iron-core characteristics is important. Existing magnetizing circuit models are classified into the two categories: behavior-based modes and physics-based models. The parameter determination process of the behavior models is relatively simple, but these models cannot properly reproduce residual fluxes which has a significant influence on the magnitudes of inrush currents. On the other hand, the physics-based models are able to reproduce residual fluxes, but their parameter determination process is complicated. Considering the above, this paper proposes a behavior-based magnetizing circuit model which is capable of reproducing residual fluxes. The proposed model consists only of standard circuit elements, and its parameters are determined in a simple way using the information of name plate, test report and current-flux curve. In this paper, inrush currents of two transformers with Y-Δ and Δ-Δ connections have been calculated using the proposed magnetizing circuit model, and good agreement is found with laboratory test results.

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