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← TechnologyWhich consequence results when differential relays misinterpret inrush current in distribution transformers during transformer energization in large power systems?
A)False positive lockout occurs✓
B)Increased harmonics propagation develops
C)Transformer core lamination saturation
D)Reduced magnetizing impedance arises
💡 Explanation
A differential relay compares currents; inrush current mimics an internal fault. This leads to a *false positive lockout*, as the protection scheme trips because the relay incorrectly detects a fault. Therefore a lockout occurs rather than continued operation because the inrush is filtered.
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