Which protective action is triggered when a power transformer experiences an internal winding fault?

💡 Explanation

When an internal winding fault occurs, a differential current relay activates because it detects a significant imbalance between the current entering and exiting the transformer windings, indicating a fault within said winding. Therefore, differential relay activation results rather than overcurrent coordination, temperature alarms, or Buchholz pressure changes, each needing unique triggers.

• Which risk increases when a photovoltaic array microinverter circuit output impedance poorly matches grid impedance?
• Which behavior results when a refrigerant with high global warming potential (GWP) leaks into the atmosphere?
• Which risk increases when wavelength division multiplexing (WDM) systems suffer temperature variations?
• Which risk increases when external prestressing tendons corrode in a concrete bridge deck?
• Which outcome results during robotic arm operation under computational overload using inverse kinematics?
• Which outcome occurs when a refrigeration system compressor uses a refrigerant with high moisture content?