The present invention relates to a seismic device of a transmission tower and an overhead transmission line, and more particularly, a plurality of steel structures installed in a pylon or outdoor substation of an ultra-high voltage transmission line of 154 kV or more, that is, a steel ball is a strong wind, ground subsidence, ground behavior, etc. The present invention relates to a seismic device for a power transmission tower and an overhead transmission line for preventing the occurrence of a conduction phenomenon in advance and preventing damage due to vibrations generated from outside such as an earthquake.
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