Within a three-phase power distribution system, at transformer substations, which increased risk results when impedance differences exist?

💡 Explanation

Unbalanced impedance causes unequal current flow, stressing phases and producing circulating current, because the **impedance mismatch** dictates current distribution in parallel transformer windings. Therefore windings overheat rather than maintain thermal equilibrium across all phases because balanced impedance would minimize circulating currents.

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