Which outcome occurs when a three-phase distribution transformer lacks appropriately sized secondary circuit breakers during a single-phase fault?

💡 Explanation

When a single-phase fault occurs without adequate secondary breakers, voltage imbalance results because only one phase current increases dramatically, causing a flux imbalance and overfluxing of the transformer core. Therefore over-fluxing arises, rather than harmonic distortion, bearing damage or total collapse, which require symmetrical overload behavior within the distribution grid.

• Which outcome occurs when harmonics circulate in transformer windings?
• Which risk increases when submersible pump bearings operate without adequate lubrication at depth?
• Which consequence occurs when aircraft landing gear's strut experiences seal failure during taxi?
• Which risk increases when ambient temperature affects MOSFET threshold voltage?
• Which operational risk escalates when heat input surpasses design limits in vapour-compression refrigeration?
• Which risk significantly increases when liquid fuel enters an internal combustion engine cylinder *after* combustion?