Question: In order to avoid difficulties with third-harmonic exciting current, which three-phase transformer connection is seldom used for step-up transformers between a generator and a transmission

In order to avoid difficulties with third-harmonic exciting current, which three-phase transformer connection is seldom used for step-up transformers between a generator and a transmission line in power systems.

(a) $\mathrm{Y}-\Delta$

(b) $\Delta-\mathrm{Y}$

(c) $\mathrm{Y}-\mathrm{Y}$

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