| 摘要 |
In an oil-filled electric cable system, a joint between two cables includes an insulator 11 formed with a channel 18 extending to a region adjacent the jointed ends of the cable conductors and serving to facilitate initial impregnation of the joint insulation at that region. Oil feed to the cable in service of the cable system is not carried out through this channel, but is instead carried out directly into the space below the sheath 3 of each cable, for example through a lead 19 extending through the joint casing and into a closure 6 applied to the end of the cable sheath within the joint. Cable conductor 1 is mechanically and electrically connected to a joint ferrule 4 which also closes the end of the oil duct in the conductor. This ensures that little or no oil flows through the joint insulation in service of the system so avoiding weakness in the insulation caused e.g. by conducting particles. <IMAGE> |
