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

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

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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(c) Lightning and switching overvoltages are both important factors to consider when dimensioning overhead lines. (i) Draw a graph that shows the shape of the breakdown voltage versus gap distance curves for lightning and switching overvoltages of negative and positive polarities. (ii) Explain the meaning of the gap-factor 'k' used when expressing the relationship between breakdown voltage and gap distance. (iii) Describe how a coordination gap that is usually placed across overhead line insulators reduces the risk of failure of transformers within a substation.
Transcribed Image Text:(c) Lightning and switching overvoltages are both important factors to consider when dimensioning overhead lines. (i) Draw a graph that shows the shape of the breakdown voltage versus gap distance curves for lightning and switching overvoltages of negative and positive polarities. (ii) Explain the meaning of the gap-factor 'k' used when expressing the relationship between breakdown voltage and gap distance. (iii) Describe how a coordination gap that is usually placed across overhead line insulators reduces the risk of failure of transformers within a substation.
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