Bundled conductor

Japanese: 多導体方式 - たどうたいほうしき（英語表記）bundled conductor

A method in which the conductor of a transmission line is composed of two or more conductors with the same potential. Many conductors are arranged at the vertices of a polygon using metal fittings called spacers. The distance between the conductors is, for example, about 40 cm. In transmission lines using three-phase AC, one conductor was used for each phase (single conductor method), but as the transmission voltage increased, the electric field on the conductor's surface became stronger, causing corona discharges that resulted in power loss (corona loss) and corona noise, which became a problem. To solve this problem, a method was used to increase the radius of the conductor to reduce the surface electric field, but this also had its limitations, so the multi-conductor method was invented, in which the conductor of one phase is divided into many parts and arranged slightly apart, which solved the problem.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

送電線の導体を同じ電位をもつ2本以上の導体で構成する方式。多数の導体をスペーサーと呼ばれる金具で多角形の頂点に配置する。導体間の間隔は例えば40cmくらいである。三相交流を用いた送電線では各相に1条の導体を用いていた(単導体方式)が，送電電圧が高くなると導体表面の電界が強くなり，コロナ放電が発生して電力損失(コロナ損)やコロナ雑音を生じて問題になった。この解決策として導体の半径を太くして表面電界を減らす方法が行われたが，これにも限度があり，一相の導体を多数に分割してやや離して配置する多導体方式が発明されて解決した。

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

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