How does ungrounded y connected primary connection do so

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Explain how does a delta connected primary of a three phasetransformer prevent: (a) triple frequency currents from flowing inthe main lines of the power system; (b) while still providing atime sinusoidal flux linking the coils of each phase of the secondary to produce sinusoidal voltage for the customers.
And how does ungrounded Y connected primary and zig-zag connection do so?

Reference no: EM13295460

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