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1. HIGH VOLTAGE
ENGINEERING
CORONA
DISCHARGES
IN SIMPLE
LAUNGUAGE
LEC # 09
BREAKDOWN
IN GASES

2. CORONA DISCHARGES
 Corona Discharge an electrical
discharge appearing on and around
the surface of a charged conductor,
caused by ionization of the
surrounding gas
 If the field is non-uniform, an increase in
voltage will first cause a discharge in the
gas to appear at points with highest
electric field intensity, namely at
sharp points or where the electrodes
are curved or on transmission lines.
Corona discharge on a 500
kV overhead power line

3. DISCHARGE
TAKES PLACE
ELECTRIC FIRLD
INCREASES
SPACE CHARGE
IONISED
HOW CORONA DISCHARGE TAKES PLACE ?
CORONA
DISCHARGE
MORE FREE
IONS FORM

4. CORONA DISCHARGES

5. CORONA DISCHARGES

6. PROPERTIES OF CORONA DISCHARGES
 In the air, coronas generate gases such
as ozone (O3) and nitric oxide (NO),
and in turn, nitrogen dioxide (NO2), and
thus nitric acid (HNO3) if water vapor is
present.
 This form of discharge is called a
CORONA DISCHARGE and can be
observed as a bluish luminescence
The corona discharge
around a high-voltage coil