Measurement of Local Magnetic Flux in the T-Joint Model of a Three-Phase Stacked Transformer Core

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  • Okabe S.
    Technical Research Laboratories, Kawasaki Steel Corporation
  • Ishida M.
    Technical Research Laboratories, Kawasaki Steel Corporation
  • Kurosawa M.
    Technical Research Laboratories, Kawasaki Steel Corporation

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  • 三相積鉄心変圧器のT接合部モデルの局所磁束測定
  • サンソウ セキテッシン ヘンアツキ ノ T セツゴウブ モデル ノ キョクショ

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Abstract

Local magnetic flux in the T-joint model of three-phase stacked transformers was examined by a stylus probe method. The distribution of the rotational loss in the T-joint part was determined by two-dimensional SST measurement. The deterioration of the iron loss in the form of the iron loss in the T-joint model to the iron loss in the material was calculated. The deterioration caused by the rotational flux decreased as the excitation magnetic flux density increased, whereas the deterioration caused by the distortion of the wave form of the local magnetic flux increased. Therefore the penetration of the magnetic flux into the limb and the yoke was determined to be the major cause of the increase in the iron loss of transformers at higher inductions.

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