Polyphase transformers

Polyphase transformers



For three-phase supplies, a bank of three individual single-phase transformers can be used, or all three phases can be incorporated as a single three-phase transformer. In this case, the magnetic circuits are connected together, the core thus containing a three-phase flow of flux.[24] A number of winding configurations are possible, giving rise to different attributes and phase shifts.[25] One particular polyphase configuration is the zigzag transformer, used for grounding and in the suppression of harmonic currents.