LP insulators - LP insulators

…In the early days of power transmission, pin insulators, as shown in Figure 4, were used exclusively. As the voltage increased, the size of these insulators had to be increased, and they had the disadvantage of being unable to be used with thick electric wires due to their strength. As a result, they gradually fell into disuse in the early Taisho period with the development of suspension insulators, and after the appearance of the smarter LP (line post) insulators, as shown in Figure 5, in the 1950s, they were rarely seen in Japan. Figure 6 shows a long-rod insulator that is widely used in Germany, and is also used in some parts of Japan. …

*Some of the terminology used to refer to "LP insulators" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…送電の初期のころには図4のピンがいしがもっぱら用いられていた。このがいしは電圧が高くなるにつれてサイズを大きくしなければならず，また強度上太い電線に使えない欠点があり，大正時代の初め懸垂がいしの開発によってだんだん影が薄くなり，昭和30年代に，よりスマートな図5のLP(line post)がいしが出現してから，日本ではほとんど姿を見なくなった。図6はドイツで広く使用されている長幹がいしで，日本でも一部で使用されている。…

※「LPがいし」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報