Which risk increases when a three-phase motor control circuit experiences a single-phase condition?

💡 Explanation

When a three-phase motor operates single-phased, current imbalance occurs due to loss of one voltage creating higher currents in remaining phases, leading to increased heat dissipation via I^2R losses in stator windings. Therefore, winding temperature increases, rather than altered braking, distortion or power factor which involve balanced three currents.

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• Maintaining constant transformer voltage with fluctuating demand requires which mechanism in the tap changer circuit?