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The application of shielding and protection devices to an industrial power system for protection against damage and outages due to lightning strokes is described. The system is dedicated to the function of driving deep well pumps for a paper mill water supply. A description of the system is provided, together with a description of severe problems encountered due to lightning strokes. The basic approach to correction of problems is described, as well as the theoretical basis for selection of that approach. A mathematical analysis is presented to show that this approach rests on a sound physical foundation, and operating experience is presented, showing that during nine successive lightning seasons no problems related to lightning have occurred.