Overhead ground wire

Japanese: 架空地線 - かくうちせん（英語表記）overhead ground wire

A ground wire is a conductor that is installed on a steel tower or pole to protect overhead transmission and distribution lines from direct and induced lightning strikes. In general, overhead ground wires can reduce the induced voltage caused by lightning by about half due to their electrostatic shielding effect, so they are effective in preventing induced lightning for low-voltage transmission and distribution lines. For transmission lines of 110 kV or more, they serve more as a protection against direct lightning strikes than as a shield, and the Whitehead-Armstrong theory is used for their installation.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

直撃雷や誘導雷から架空送配電線を保護するために鉄塔や電柱に架設された導線で，接地してある。一般に，架空地線はその静電遮蔽効果で雷による誘導電圧を約半減することができるので，電圧の低い送電線や配電線路には誘導雷防止に有効である。また，110kV以上の送電線路ではこの効果よりも直撃雷防止の役目をなし，この架設にあたってはホワイトヘッド＝アームストロングの理論が用いられる。

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