“Electrical Corona”
contents
1. Corona
2. Mechanism of corona discharge
3. Factor affecting corona
4. Method of reducing corona
5. Advantages
6. Effect of corona
7. Application of corona
Corona
. The phenomenon of violet glow ,hissing n
and production of ozone gas in an Overh
transmission line is known as corona.
. Corona results in a power loss. Power loss
like corona result in operating inefficienc
increase the cost of service forall ratepa
major concern in transmission line design
reduction of losses.
Corona
Corona formation
Mechanism of corona discharge
Factor affecting corona
1. Atmosphere
2. Conductor size
3. Spacing between conductor
4. Line voltage
Method of reducing corona
1. By minimizing the voltage stress and electric fi
gradient
2. Surface Treatments
3. Homogenous Insulators
4. Using Bundled Conductors
5. Using Bundled Conductors
6. Using Corona rings
7. Whether
8. New Conductor
9. By increasing the spacing between the condu
10. By increasing the diameter of the conductor
Advantages of corona
1.Due to corona formation ,the air surrounding co
becomes conducting andHence virtual diame
conductor is increased . The increased diamet
Reduces the electrostatic stress between the c
2. Corona reduces the effects of transients produc
surges.
Effects of corona
1. Audible Noise
2. Radios and Television Interference
3. Gaseous Effluents
4. Corrosion of conductor
5. Induced Currents
6. Computer Interference
Application of corona
. Drag reduction over a flat surface
. Manufacture of ozone
. Sanitization of pool water
. Scrubbing particles from air in air-conditioning sy
. Removal of unwanted volatile organics from atm
. Photocopying
. Air ionisers
. Nitrogen laser
. Surface treatment for tissue culture (polystyrene)
. Solid-state cooling components for computer ch