| 摘要 |
PURPOSE:To obtain a noninductive instrumentation cable which withstands high temp. and high voltage by using the optical fibers which are cabled to have flat sections as a refractory insulation layer of a power line. CONSTITUTION:The primary insulation layer 2 which is placed longitudinally with mica glass tapes similar to those of refractory electric wires is provided on the outside circumference of a power line 1 for transmitting electric power. The secondary insulation layer twisted together with optical fiber cables 3 of a flat section without any space is formed thereon. A holding winding layer 4 by wrap windings of mica glass tapes is provided on the outside circumference thereof, and optical fiber cables 5 of a rate of flattening smaller than that of the cables 3 are twisted together thereon. A covering layer 6 of vinyl sheaths compounded with fire-retardant materials is provided on the outermost layer. The optical fiber cables are formed by flattening the bundle fibers bundled with plural pieces of optical fibers. |
