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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Optical ground wire ： ウィキペディア英語版 Optical ground wire An optical ground wire (also known as an OPGW or, in the IEEE standard, an optical fiber composite overhead ground wire) is a type of cable that is used in the construction of electric power transmission and distribution lines. Such cable combines the functions of grounding and communications. An OPGW cable contains a tubular structure with one or more optical fibers in it, surrounded by layers of steel and aluminum wire. The OPGW cable is run between the tops of high-voltage electricity pylons. The conductive part of the cable serves to bond adjacent towers to earth ground, and shields the high-voltage conductors from lightning strikes. The optical fibers within the cable can be used for high-speed transmission of data, either for the electrical utility's own purposes of protection and control of the transmission line, for the utility's own voice and data communication, or may be leased or sold to third parties to serve as a high-speed fiber interconnection between cities.〔G. F. Moore, (ed) ''Electric Cables Handbook (3rd Edition) '', Blackwell Publishing ,1997 ISBN 978-0-632-04075-9 , chapter 50.32 ''Composite overhead conductors''〕 The optical fiber itself is an insulator and is immune to power transmission line and lightning induction, external electrical noise and cross-talk. Typically OPGW cables contain single-mode optical fibers with low transmission loss, allowing long distance transmission at high speeds. The outer appearance of OPGW is similar to ACSR cable usually used for shield wires. ==History== An OPGW cable was patented by BICC in 1977 〔 and installation of optical ground wires became widespread starting in the 1980s. In the peak year of 2000, around 60,000 km of OPGW was installed world-wide. Asia, especially China, has become the largest regional market for OPGW used in transmission-line construction.〔http://books.google.ca/books?id=b8RQfNaM08YC&pg=PA2&dq=OPGW&hl=en&sa=X&ei=TBNVT8L1OvSF0QHP9IjcDQ&redir_esc=y#v=onepage&q=OPGW&f=false retrieved 2012 Mar 5〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Optical ground wire」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.