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What is purpose of connecting zigzag connection in one secondary side of a distribution transformer?

April 26, 2017connection distribution Engineering Mathematics purpose Secondary zigzag

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What is purpose of connecting zigzag connection in one secondary side of a distribution transformer?

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Zigzag connection in the secondary side of a distribution transformer is needed when the the transformer secondary is delta connected and a neutral grounding is needed so that 480/1.732 = 277 volts may be obtained.