A Method for Estimating the Current-Flux Curve of a Three-Phase Transformer for Electromagnetic Transient Simulations of Inrush Currents

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  • 励磁突入電流の瞬時値解析を目的とした三相変圧器の電流-磁束特性推定手法
  • レイジトツニュウ デンリュウ ノ シュンジチ カイセキ オ モクテキ ト シタ サン ソウヘンアツキ ノ デンリュウ-ジソク トクセイ スイテイ シュホウ

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Abstract

<p>When a transformer of a customer is energized in a distribution system, inrush currents whose magnitudes reach tens of rated currents may occur. The inrush currents may lead to an instantaneous voltage drop and/or an unnecessary operation of an overcurrent relay, and thus they affect power quality in the distribution system. When a new customer is connected to a distribution system, transmission and distribution companies in Japan use current-versus-time data of transformer inrush currents for their studies. However, such studies using current-versus-time data give worst-case or overestimated results. So as to obtain more accurate results, current-versus-flux curves of transformers are required to carry out simulations using an electromagnetic transient analysis program such as XTAP. So far, we have developed a method for estimating the current-versus-flux curve of a single-phase transformer from its current-versus-time data. Considering the fact that most of customer transformers are three-phase ones, this paper proposes a method for estimating the current-versus-flux curve of a three-phase transformer. The proposed method is validated by inrush-current experiments using two different three-phase transformers.</p>

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