In a three-phase power system utilizing transformer differential protection, which outcome occurs when inter-turn fault arises inside the transformer winding?

💡 Explanation

Delta winding circulating currents increase because the zero-sequence currents are induced through the fault path, causing differential relay operation. Therefore, differential protection trips, rather than overcurrent or harmonic resonance induced by system imbalances.

• Which risk increases when a residential heat pump's defrost cycle malfunctions?
• Which risk increases when welding rebar directly to structural steel in a concrete column?
• Which risk increases when excessive cylinder bore distortion occurs in an internal combustion engine?
• Which outcome accelerates in hydraulic actuator seals when fluid temperature rises significantly?
• Which mechanical failure mode arises from excessive localized deformation during cold forging of an alloy?
• Which safety outcome relies on differential current protection in three-phase power transformers within distribution networks?