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The presence of ozone due to corona is harmful because it
Corrodes the material
Transfer energy to the ground
Gives odour
Any of the above
Corrodes the material
Corona discharge in high-voltage transmission lines ionizes the surrounding air, facilitating the formation of ozone (O3тАЛ) and other chemical species. These byproducts are harmful as they are chemically reactive, leading to the corrosion of insulators and conductors, and they contribute to environmental degradation.
Corona discharge in high-voltage transmission lines ionizes the surrounding air, facilitating the formation of ozone (O3тАЛ) and other chemical species. These byproducts are harmful as they are chemically reactive, leading to the corrosion of insulators and conductors, and they contribute to environmental degradation.
PcтАЛ=╬┤242.2тАЛ(f+25)drтАЛтАЛ(VтИТVdтАЛ)2├Ч10┬░тИТ5 тАФ Peek's law for power loss due to corona (kW/km/phase)
When the voltage gradient at the conductor surface exceeds the dielectric strength of air, the air breaks down (ionization). This creates a glow, hiss, and vibration. The electrical discharge provides energy to break stable O2тАЛ molecules, which recombine to form O3тАЛ. The accumulation of O3тАЛ is hazardous due to its oxidizing nature, which accelerates material aging and produces a characteristic pungent odour.
Corona is a localized discharge resulting from ionization of air.
Ozone is a strong oxidizing agent, causing corrosion of copper/aluminum conductors.
Ozone production is proportional to the intensity of the corona discharge.
The presence of ozone causes localized chemical stress on dielectric surfaces.
Visual indicator of high electric stress
Helps in identifying faulty insulator strings
Causes power loss in transmission lines
Generates Radio Interference (RI) and Television Interference (TVI)
Chemical corrosion due to ozone and nitrous acid formation
Ozone generators (industrial)
Corona surface treatment in plastic film manufacturing
The characteristic odour of ozone is often the first indicator of high-voltage corona activity near substations.
Option A is correct as ozone is a highly reactive oxidant.
Option B is valid because leakage current paths are modified by chemical contaminants.
Option C is valid as ozone has a distinct, pungent, bleach-like smell.
D is correct тАФ The formation of ozone by corona discharge leads to chemical corrosion, energy loss, and creates a noticeable pungent odour.
Always remember that corona is an 'indirect' loss mechanism that impacts the physical integrity of the hardware, not just the electrical efficiency of the power grid.