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Lightning phenomenon and parameters for engineering application

Lightning phenomenon and parameters for engineering application

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In this chapter, basic lightning terminology is introduced, different types of lightning are described, and main lightning processes are identified. For the most common negative cloud -to -ground lightning, the number of strokes per flash, interstroke intervals, flash duration, multiple channel terminations on ground, and relative stroke intensity within the flash are discussed. Traditional lightning parameters needed in engineering applications include lightning peak current, maximum current derivative, average current rate of rise, current risetime, current duration, charge transfer, and specific energy (action integral), all derivable from direct current measurements.

Chapter Contents:

  • 2.1 Types of lightning and main lightning processes
  • 2.1.1 Overview
  • 2.1.2 Downward negative lightning
  • 2.1.3 Downward positive lightning
  • 2.1.4 Artificially initiated lightning
  • 2.1.5 Upward lightning
  • 2.2 Number of strokes per flash
  • 2.3 Interstroke intervals and flash duration
  • 2.4 Multiple channel terminations on ground
  • 2.5 Relative stroke intensity within the flash
  • 2.6 Return-stroke peak current—"classical" distributions
  • 2.7 Return-stroke peak current—recent direct measurements
  • 2.8 Current waveshape parameters
  • 2.9 Correlations between the parameters
  • 2.10 Return-stroke propagation speed
  • 2.11 Equivalent impedance of the lightning channel
  • 2.12 Mathematical expressions for the lightning current waveform
  • 2.13 Summary
  • 2.14 Future work
  • Acknowledgments
  • References

Inspec keywords: lightning protection

Other keywords: current duration; average current rate of rise; lightning phenomenon; flash duration; current risetime; lightning peak current; lightning processes; relative stroke intensity; negative cloud-to-ground lightning; multiple channel terminations; direct current measurements; lightning terminology; interstroke intervals; maximum current derivative; engineering application; charge transfer

Subjects: Power system protection

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