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How Lightning Works?
Transcript of How Lightning Works?
Technical Sales Engineer
Measurement and Controls Technology Inc How lightning works? What is Lightning? It travels in steps that varies from 10-260meters til it reaches the ground Lightning can also reach 5 miles long
and can generate 10 million volts 5 miles (8.04km) 10,000,000 volts ... small Lightning is the product of the neutralization process of the charged earth surface(+) and the base of the cloud(-) Lightning Protection System Presentation It can raise the air temperature around it to 50,000 degrees Fahrenheit
(27,760 Celsius) 3 Stages of Lightning Activity Pre-Discharge Stage Channeling Stage Return Stroke Stage Storm Cell
5kV/m-30kV/m Potential Build-Up Friction Charge separation Potential Difference
between the base
of the cloud and
the earths surface Size Range 10 to 103kM2
Charge Range 10 – 120 C
Voltage at Peak 10^9 to 10^10
Height Above Earth 0.1 to 6kM Pre-Discharge Data Stepped Leader Counter
Leader Stepped leaders are created at the base of the cloud. - - - - - - - - - - - - - - - - -- - - so did Newton. Everybody noticed at least once that apples fall from the apple tree. Counter Leaders are created from the earth's surface. It is mostly created from sharp objects
and emits a purplish glow around it. It is also invisible to the eye It travels in steps that varies from 10-260m and has a 50microsecond delay in between steps It is also called "Corona" or "st.Elmo's Fire" Leader Data 99%
Total Charge 1 to 20 C
Average Charge 5 C
Per Unit Length 10-3 C/m
Propagation Speed 0.4 – 1.2 m/µs
Pulse Rise Time 100µs
Leader Potential 10^7-10^10 Volts
Step Time 13 – 50µs
Step Length 10 – 260 meters Peak Current 2 – 510 kA
99% <200 kA
50% approx. = 30 kA
Polarity Negative > 90%
Time Between Flashes > 10 Seconds
No. of Strokes per Flash 1 - 27
Time Between Strokes 10 – 30ms
Duration (99%) 30 – 200µs
RFI Range (95%) 200kHz – 20MHz + + + + + + + + + + + _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Yes, a cumulo-nimbus and the surface of the earth becomes something like this... Direct Strike Effects
Secondary Strike Effects Problems Associated to Lightning Direct Strike (cc) photo by tudor on Flickr Step/Touch
Potential Bound Charge and Arcing Electromagnetic Transients Earth Current Transients Atmospheric Transients Collecting lightning increases risk! Is it possible? Why not prevent your assets
from lightning strike instead of collecting it? Cumulonimbus Cloud because it propagates so fast `