SEALED VESSEL PENETRATING DEVICE

PROBLEM TO BE SOLVED: To prolong the manufacturable length as a single piece to a great extent beyond the capacity of a sealed vessel. SOLUTION: A cable core C is divided into a front part C1 and rear part C2, and the area around the boundary is impregnated with sulfur hexafluoride, and there a penetrating device 1 equipped with a cooling means 3 is installed. The penetrating device 1 is fitted air-tightly in a cable stretch-out hole 4a provided in a dryer can, and the front half C1 is accommodated in the can while the rear half C2 is stretched out of the can air-tightly. When the front half C1 is heated to be dried while the inside of the can is evacuated the sulfur hexafluoride is solidified by cooling using a cooling means 3 so that the communication of the cable core C in the axial direction is shut off. The solidified sulfur hexafluoride precludes the mositened external air from intruding into the can via inside the cable core C, which ensures a high degree of drying performance. Drying the rear half C2 permits manufacturing of a power cable having excellent insulating performance in a length twice the capacity of the dryer can.