V6 (c) Lightning and switching overvoltages are both important factors to considerwhen dimensioning overhead lines.(i) Draw a graph that shows the shape of the breakdown voltage versus gapdistance curves for lightning and switching overvoltages of negative andpositive polarities.(ii) Explain the meaning of the gap-factor 'k' used when expressing therelationship between breakdown voltage and gap distance.(iii) Describe how a coordination gap that is usually placed across overheadline insulators reduces the risk of failure of transformers within asubstation.

The voltage across electrical components at the time of switching is called switching over voltage.…

Answered: (c) Lightning and switching…

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter7: Symmetrical Faults

Section: Chapter Questions

Problem 7.21MCQ

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