抄録
We have been developing GILs for use as large capacity transmission lines since 1969. In 1979, GIL was applied to a 154kV in-yard link line of The Tokyo Electric Power Co., Inc. for the first time in Japan. In 1980, we began the development of a compact GIL to improve cost efficiency and applicability, it was applied to a 500kV incoming line of The Tokyo Electric Power Co., Inc. in 1985. This project planned as 275kV getaway lines connected to overhead line (810mm2×4) in Shin Noda Substation of The Tokyo Electric Co., Inc. The 8, 000A class 275kV GILs are the largest current underground transmission lines in the world. The paper describes the design, installation and tests of the project.
