Abstract
The DC-bias experiments were carried out on two identical single-phase autotransformers which parameters are 250MVA/500kV. The aim of the experiments was to test the ability of transformers for withstanding DC bias. The variation laws of the electrical quantity, the temperature rise, vibration with the increasing DC current under no-load are obtained. The effective value of the exciting current under DC bias is much higher than the normal no-load exciting current. The reference for the DC bias experiments of large transformers can be provided through this method.
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