Abstract:During monopolar operation of HVDC systems with ground return, large currents returned from earth may enter into neutrals of transformers, which causes DC bias of transformers and influence transformers running. The reason of DC bias of transformers and the factor of tolerated DC bias are analyzed in this paper. Great capacity transformers constructed in the form of three-phase groups or three-phase five-legged are more prone to DC bias saturation because the air gaps between laminations are small. According t… Show more
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