Power supplies to urban centers using overhead transmission lines are becoming increasingly harder due to the vertical expansion of buildings and urban congestion. In response to this, people are actively planning to lay transmission cables underground. In particular, XLPE cables have recently been used whenever new underground transmission lines are installed because, compared with SCFF cables, no oil filling equipment and little maintenance is required for XLPE cables. Note that underground transmission cables are not seen by the public because most sections of the cables are installed in underground tunnels. They are not major players, but take a backseat in supporting the supply of energy.
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