The problem of Intentional Destructive Electromagnetic Impacts (IDEI) on power systems becomes recently more and more actual in connection with two modern trends: an extending application of microelectronics and microprocessorbased devices and systems in electric power industry — on the one hand, and intensive designs special equipment for distance destruction of electronic devices and systems — with another. The most powerful method for such destruction is the High-altitude Electromagnetic Pulse (HEMP) as a result of high-altitude nuclear explosion. The history of experimental high-altitude nuclear explosions includes already half a century. During this time many tens the scientific articles, books, reports and standards in details presenting this phenomenon and measures of protection from it, have been published by English. However, all these materials have remained unknown to the Russian experts in civil sectors and especially in power engineering. Consequently, rare publications on this theme cause only negative emotions and indignation. Such relation to a problem and its full ignoring threatens national security and should be radically changed.