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← TechnologyWhich risk sharply increases when a variable frequency drive (VFD) supplies a long motor feeder circuit?
A)Reflected voltage causing motor insulation breakdown✓
B)Harmonic resonance overheating the supply transformer
C)Inrush current tripping upstream circuit breakers
D)Reduced motor torque due to voltage drop
💡 Explanation
When a VFD feeds a long motor feeder circuit, impedance mismatches cause voltage reflections due to rapid PWM switching, leading to standing waves and increased voltage stress. Therefore reflected voltage problems increase risk of motor insulation breakdown, rather than transformer heating, breaker trips, or torque loss, which involve different inductive load conditions.
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