24
Lightening Protection Guide: Ms.Jhansi.K (Asst.Prof) AkashRoy(1sg09ee004)

Lightening Protection

Embed Size (px)

Citation preview

Lightening Protection

Guide:Ms.Jhansi.K (Asst.Prof)

AkashRoy(1sg09ee004)

Scope

• What & why of lightening• Designing factor of lightening protection• Types of protection• Lightening detection • Conclusion

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

What & why of lightening

• Mechanism

What & why of lightening

Break down

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

What & why of lightening

Characteristics o Peak value of current o Steepness of lightening currento Charge of lightening current o Specific energy of lightening current

What & why of lightening

• Peak value of current

• Steepness of lightning

What & why of lighteningCharge of lightening

• Specific Heat

Designing factor of lightening protection

Fundamentals of risk assessment

Designing factor of lightening protection

Types of losses

Designing factor of lightening protection

Types of protection

Air termination Rolling sphere Mesh protection Protective angle

Ground conductor method

Types of Protection

Rolling sphere method

Types of Protection

Rolling sphere method

Types of Protection

Mesh method

Types of Protection

Protective angle method

Types of Protection

Ground conductor method

Lightening detection

• Ground based system using multiple antennao radio detection & characteristic frequency• Mobile system o Frequency and attenuation• Space based systemo Artificial satellite

Lightening detection

By Lightening detectors

Lightening detection

• By Weather Antenna

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)

References

• Lightening Detection Guide• Wikipedia• Theories of Lightening formation • Charge structure dynamics

Thank you !