Abstract
Zigzag transformer is only used as a grounding transformer in a three-phase delta connected power supply system. Equal DC current flowing through the windings of a zigzag transformer does not produce any core saturation and it may be used as an interfacing device for AC supply with DC in a power system. This property of the transformer may be used to transmit DC and AC power simultaneously through the same transmission line. It may also be used to get three-phase voltage from three-wire, two-phase supply and may be used to maintain three-phase load voltage when any one phase of the three-phase supply line trips. This paper emphasises the role of zigzag transformer as a common interfacing device in all these new applications with some comments on the change of energy efficiency of the power system.
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