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The maximum permissible value of fair weather corona loss for HV line is
0.6 kW/phase/km
2 kW/phase/km
0.3 kW/phase/km
4 kW/phase/km
4 kW/phase/km
The maximum permissible value of fair weather corona loss for high-voltage transmission lines is considered to be 4 kW/phase/km ┬╖ This limit is set to ensure the efficient operation of power systems while keeping electromagnetic interference and power loss within acceptable engineering standards.
The maximum permissible value of fair weather corona loss for high-voltage transmission lines is considered to be 4 kW/phase/km ┬╖ This limit is set to ensure the efficient operation of power systems while keeping electromagnetic interference and power loss within acceptable engineering standards.
PcтАЛ=╬┤244тАЛ(f+25)drтАЛтАЛ(VтИТVcтАЛ)2├Ч10тИТ5 тАФ Empirical formula for Corona loss in kW/phase/km
VcтАЛ=m0тАЛg0тАЛ╬┤rln(rdтАЛ) тАФ Disruptive critical voltage formula
Corona loss occurs when the potential gradient at the conductor surface exceeds the dielectric strength of air (approximately 30 kV/cm peak) ┬╖ This leads to ionization of the surrounding air, resulting in power dissipation, radio interference, and audible noise ┬╖ It is influenced by conductor diameter, line voltage, surface condition, and weather factors.
Corona loss increases significantly during foul weather (rain, fog, snow).
Transmission lines are designed to operate below the disruptive critical voltage to minimize losses.
Higher conductor radius reduces the surface potential gradient, thereby reducing corona loss.
Corona loss leads to power wastage and causes interference with communication lines.
Reduces line voltage spikes during switching surges.
Acts as a protective mechanism against overvoltage transients.
Significant power dissipation reducing transmission efficiency.
Generates audible noise and radio frequency interference.
Leads to ozone production causing chemical corrosion on hardware.
EHV and UHV transmission line design.
Substation busbar design and clearance calculation.
The 4 kW/phase/km limit serves as a threshold for standard AC transmission lines.
Options A, B, and C provide values significantly lower than the recommended engineering ceiling for standard high-voltage design requirements.
D is correct тАФ The maximum permissible fair weather corona loss is 4 kW/phase/km to maintain system reliability.
Remember that corona loss is directly proportional to frequency and inversely proportional to the logarithm of the ratio of spacing to radius of the conductor.