Abstract: An elongated flexible gas-insulated transmission line cable is fitted with pressure-tight termination assemblies at its opposite ends before it is placed on a reel for shipment. The cable is then filled with dry gas, such as nitrogen, at a relatively low positive pressure and the cable is then reeled and shipped. The cable terminal ends are adapted for easy connection to other circuit components without requiring access to the interior of the cable and the terminals permit the purging of the nitrogen gas and the installation of sulfur hexafluoride or some other electronegative gas before the cable is placed into operation.

Abstract: The support insulator for a flexible gas-insulated transmission line is formed in two halves which can be snapped together and over the central conductor of the transmission line. The insulator halves each contain a central hub region and an outer rim region which are connected to one another by a thin connecting web of uniform thickness. The thin connecting web has axially offset regions which are connected to one another by axially extending side regions. Each of the axially offset regions has a generally pie or wedge shape and substantially increase the stiffness modulus of the insulator structure.

Abstract: A corrugated flexible thin copper tube filled with sodium has a resilient flexible core along the axis thereof so arranged that it will contract and expand to take up the force of thermal expansion and contraction of the sodium. Since the coefficients of expansion of the sodium and copper are different, the absorption of this differential in force by the core prevents rupture of the copper tube and the formation of voids and hot spots within the copper tube.