Composite Fiber-optic overhead ground wires (OPGWs) have been installed to major power transmission lines. Using these OPGWs, maintenance information systems for power transmission lines have been devel-oped and put into practice. However, there still remain problems in data transmission scheme. The variety of information required for power line maintenance work includes data which practically allow rather slow transmission as well as data which require high speed transmission. It also includes data of both periodical and random initiation. Therefore, single data transmission method with single speed throughout the system will result in the deterioration of efficiency and economy. The authors investigated the features of various types of information required for power line maintenance, and studied the method of data transmission through the optical fibers within OPGWs. As a result, it was found that the hierarchy-type configuration which is composed of high-speed trunk line by cyclic data transmission and low-speed local line by random data transmission is effective for the sysems. This method has been applited to actual power lines. The practical performance is also discussed in this paper.
J-STAGEがリニューアルされました！https://www.jstage.jst.go.jp/browse/-char/ja/
