2. Scope
• What & why of lightening
• Designing factor of lightening protection
• Types of protection
• Lightening detection
• Conclusion
3. What & why of lightening
• Flash that temporarily neutralizes massive
electrostatic discharge within / among clouds
or to earth surface
• Intra cloud , cloud to cloud , cloud to ground
• 40 -50 strikes per second, 1.4 billion per year
• Latitude , prevailing wind ,relative humidity,
proximity to cold and warm bodies
6. What & why of lightening
• Tropics freezing level is high so 10% are CG
• Norway 50% are CG
• Mountains of Eastern Democratic Republic of
Congo have 146 strikes per sqkm
7. What & why of lightening
Characteristics
o Peak value of current
o Steepness of lightening current
o Charge of lightening current
o Specific energy of lightening current
8. What & why of lightening
• Peak value of current
• Steepness of lightning
9. What & why of lightening
Charge of lightening
• Specific Heat
19. Lightening detection
• Ground based system using multiple antenna
o radio detection & characteristic frequency
• Mobile system
o Frequency and attenuation
• Space based system
o Artificial satellite
22. Lightening detection
Limitation(s)
Rejection of cloud to cloud flash(Ground
antenna)
Miss-interpretation due to attenuation tech
(Mobile Antenna)
Slow availability w.r.t real time application
(Satellite)
