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Controlling Lightning Induced Outages on Overhead LinesByKevin Mara, Protection Overview Why do we need Lightning protection? 20% of all distribution Outages are caused by Lightning . Reliability Cost What is Lightning ? How to establish good Lightning protection of Lightning Wave Shape Follows Ohms law V = I x R Strike has current flowing and path has impedance Voltage is caused by current flowDefinition of Lightning Wave Shape Standard Direct Lightning Strike Current Wave 8/20 s 8 microseconds rise time to 90% peak 20 microseconds to half of peak value Standard Direct Lightning Strike Voltage Wave s microseconds rise time to 90% peak 100 microseconds to half of peak value Standards used in surge testing and ratings of equipmentTypical Wave Shape used to Define Lightning for Laboratory TestsPeak Current AmplitudeMedianlo g10I33834 C urrent Am plitudeNum ber o f ValuesData MedianP ro b a b ility o f Exceeding 100kALog-Norm al Approxim ationNumber of Strokes per Flash12345678910 or moreFrequency of Occurrence (%)
Controlling Lightning Induced Outages on Overhead Lines By Kevin Mara, P.E. 770-425-8100
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