Power distribution equipment is used to supply electricity to consumers, and has been upgraded primarily to improve reliability and efficiency. However, the spread of energy-saving equipment and declining population will lead to a saturation trend in electricity demand, which will reduce the opportunities for upgrading equipment. Therefore, when equipment is upgraded, it must be upgraded to equipment that can be used for a longer period of time. In addition, due to labor shortages, when upgrading equipment, it is necessary to upgrade to equipment that can be upgraded with minimal effort. In order to respond to these needs, it is important to understand the history of improvements in power distribution equipment. Therefore, the technical transitions of power distribution equipment and future-oriented technology trends are summarized in the Institute of Electrical Engineers of Japan Technical Report (No. 1548). This section introduces the technical transitions of major equipment (concrete poles, electric wires, cables, and pole-mounted transformers).
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