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Lightning interaction with low-voltage overhead power distribution networks

Lightning interaction with low-voltage overhead power distribution networks

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In this chapter, the major mechanisms by which overvoltages are stemmed from lightning were discussed. Particular emphasis was given to the voltages nduced on overhead LV networks by nearby strokes and to those transferred from the MV system, which are the most important ones on account of their magnitudes and frequencies of occurrence. Simple and effective models were used to represent the high frequency behaviour of typical distribution transformers and LV power installations

Chapter Contents:

  • 5.1 Typical configurations of LV networks
  • 5.2 Lightning surges on LV power systems
  • 5.2.1 Cloud discharges
  • 5.2.2 Direct strikes
  • 5.2.3 Indirect strikes
  • 5.2.3.1 Stroke current magnitude and waveform
  • 5.2.3.2 Relative position between the line and the stroke location
  • 5.2.3.3 Distance between the line and the lightning strike point
  • 5.2.3.4 Ground resistance and type of grounding system
  • 5.2.3.5 Soil electrical parameters
  • 5.2.4 Transference from the MV line
  • 5.2.4.1 Direct strikes
  • 5.2.4.2 Indirect strikes
  • 5.3 Lightning protection of LV networks
  • 5.3.1 Distribution transformers
  • 5.3.2 LV power installations
  • 5.4 Concluding remarks
  • References

Inspec keywords: overvoltage protection; power transformers; lightning protection; power distribution protection

Other keywords: overvoltages; overhead LV network; low-voltage overhead power distribution networks; distribution transformers; lightning interaction

Subjects: Distribution networks; Transformers and reactors; Power system protection

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