Lightning discharge is a common natural phenomenon, in which part of lightning discharge is caused by thundercloud to the earth. In this case, it may cause certain harm to the objects on the ground, especially to the power system. The common lightning protection devices are lightning rod (wire), lightning arrester and grounding device. The most common lightning protection measures for direct lightning is to install lightning rod. This paper mainly studies the lightning protection principle of lightning rod and the lightning protection range of single and two equal height lightning rods, and gives the problems that should be paid attention to when erecting lightning rod.<BR>
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