umbrella insulator
Technical term for a type of electrical insulator shaped like an umbrella, used in power transmission and distribution.
Umbrella insulators are used on power transmission lines.
碍子 is the general term for an electrical insulator; 傘形碍子 specifies the umbrella-shaped type.
Compound of 傘形 (umbrella-shaped) and 碍子 (insulator). The exact historical derivation is uncertain; the term is a modern technical coinage.