High voltage tension insulators

For high-voltage lines of anchor is the national (TEPCO other) popular type of stone.
It is also used for overhead ground wire outside the high-voltage lines.
There is no cover in one line side as TEPCO.

 

Pole Insulators

Insulator String

 Glass or porcelain insulator strings are used to suspend overhead lines. They form a set of series capacitors and have stray capacitance with the tower which causes variation in the voltage distribution. Metal tubes are added at the HV end of the string to improve the voltage distribution.