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← ScienceWhich risk increases substantially when a high-voltage DC transmission line undergoes heavy icing along its conductors approaching winter?
A)Corona discharge current increases rapidly✓
B)Capacitance between line poles increases
C)Skin effect impedance vanishes entirely
D)Thermionic emission from conductors declines
💡 Explanation
Corona discharge intensifies with ice because the increased surface irregularities enhance the electric field, leading to ionization of surrounding air via avalanche breakdown. Therefore, discharge currents rise because ice creates high field gradients, rather than effects on capacitance.
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