definetion of corona and some lab experments

8/7/2019 definetion of corona and some lab experments

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Laboratory

REPORT

PREPARED FOR :

ENG: Muhamed Taha

PREPARED BY:

1. Khaled Jamal sec: 3 B.N:6

2.Hassan Nabeel sec :3 B.N:3

3. Hammadah Ramadhan sec :3 B.N:5

4.Khaled suliman sec :3 B.N:7

5.Amr Abd Almon'em sec: 5 B.N :2

6.Kareem Mustafa sec: 5 B.N:7

Coronacorona discharge is an electrical discharge brought on by the ionization of a fluid

surrounding a conductor, which occurs when the potential gradient (the change in the

strength of the electric field) exceeds a certain value, but conditions are insufficient to

cause complete electrical breakdown or arcing.


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Problems caused by corona discharges

Coronas can generate audible and radio-frequency noise, particularly near electric

power transmission lines. They also represent a power loss, and their action on

atmospheric particulates, along with associated ozone and NOx production, can also

be disadvantageous to human health where power lines run through built-up areas.

Therefore, power transmission equipment is designed to minimise the formation of

corona discharge.

Corona discharge is generally undesirable in:

y Electric power transmission, where it causes:

o Power loss

o Audible noiseo Electromagnetic interference

o Purple glowo Ozone production

o Insulation damage

y Inside electrical components such as transformers, capacitors, electric motors

and generators. Corona progressively damages the insulation inside thesedevices, leading to premature equipment failure. One form of attack is ozone

cracking of elastomer items like O-rings.

y Situations where high voltages are in use, but ozone production is to be

minimised

y Static electricity discharge

y Lightning

ADVANTAGES OF CORONA

Corona discharge has a number of commercial and industrial applications.

i Drag reduction over a flat surface

ii Removal of unwanted electric charges from the surface of aircraft in flight

and thus avoiding the detrimental effect of uncontrolled electrical discharge

pulses on the performance of avionic systems

iii Manufacture of ozone

iv Sanitization of pool water

v Scrubbing particles from air in air-conditioning systems (see electrostatic

precipitator)vi Removal of unwanted volatile organics, such as chemical pesticides, solvents,

or chemical weapons agents, from the atmosphere


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vii Improvement of wetability or 'surface tension energy' of polymer films toimprove compatibility with adhesives or printing inks

viiiPhotocopyingix Air ionisers

x Production of photons for Kirlian photography to expose photographic film

xi EHD thrusters, Lifters, and other ionic wind devices

xii Nitrogen laserxiiiSurface treatment for tissue culture (polystyrene)

xiv Ionization of a gaseous sample for subsequent analysis in a mass spectrometer

or an ion mobility spectrometer

xv Solid-state cooling components for computer chips

RELATIONS THAT MANAGE CORONA

Where m : surface factor

=

108642d

12501000750500250d*125

8984817872Vn

12812611411078Vv

24021016212080Vb.d


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definetion of corona and some lab experments

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