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← TechnologyWhich protective action occurs when a fault introduces DC current into a three-phase power system?
A)Transformer saturation and overcurrent trip✓
B)Increased system frequency and underfrequency load shedding
C)Resonance amplification and system voltage collapse
D)Harmonic distortion and reactive power injection
💡 Explanation
When DC current appears in a three-phase AC system, transformer saturation occurs due to the asymmetrical magnetizing flux, causing a large overcurrent condition that forces circuit breakers to trip. Therefore transformer saturation results, rather than frequency changes, resonance, or distortion, which depend completely different mechanisms.
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