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Power equipment for telecommunications which uses commercial power as its input source, is easily damaged by lightning from commercial power distribution lines. The stations which have antenna towers such as microwave relay stations, are often damaged by direct lightning strike surge. Consequently, lightning protection for power equipment in order to maintain its reliability. NTT has therefore investigated...
The high monetary value and low insulation levels of rotating machines make it necessary to employ special protection. A rotating machine can be conceived as a transmission line with distributed constants, the essential difference being that the machine winding is wound back on itself in the form of turns, which may permit high voltage across the turn-to-turn insulation. The installation of special...
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