Seldom do these type of failures due to direct lightning strikes, but induced currents as the strike travels through the pole. The traditional lightning 'protectors' actually increase the strike potential as they attract the strike to be conducted through them by providing a low impedance path, thus the induced current damage could potentially increase.
Originally Posted by guggemos
We have found the highly controversial LEC systems to be an effective solution. We installed a comprehensive system over one of our largest plant that suffered 2-3 strikes and subsequent plant shutdowns. That happened 5 years ago and we experienced no shutdowns related to lightning strikes hence. The Waisala nationwide strike monitoring system actually indicated slightly increased strike density for some of the years in the area.
We also had similar experience with smaller installations, but those were not as well researched/documented after the fact, just the comment: "we no longer seem to have a problem with lighting."
Laszlo Z Weress
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