Title :
Technical report: extrusion-molded joints for world´s first long-distance XLPE cable line
Author_Institution :
Dept. of Electr. Eng., Waseda Univ., Tokyo, Japan
Abstract :
The features of a long-distance underground line, using 275-kV cross-linked polyethylene (XLPE) cable with extrusion-type molded joints (EMJs) are described. The line has a transmission capacity of 440 MW/cct and a 9.5-km section length. The cable has a cross-sectional area of 1400 mm/sup 2/ and insulation thickness of 17 mm. The EMJ, which was developed to withstand the higher stresses of the 275-kV cable, has the following features: (1) the conductor is connected using a copper ferrule, (2) semiconducting heat-shrinkable tubes are used for both inner and outer semiconducting layers, and (3) the insulation unit, applied on top of the stress-relieving cone, is made of insulating and semiconducting XLPE parts cured together in the factory. The fabrication, of the joint is described.<>
Keywords :
cable insulation; cable jointing; power cables; power transmission lines; underground cables; 275 kV; 9.5 km; XLPE cable; cross-linked polyethylene; extrusion-molded joints; fabrication; insulation unit; long-distance underground line; semiconducting heat-shrinkable tubes; stress-relieving cone; Aluminum; Cable insulation; Cable shielding; Conductors; Dielectrics and electrical insulation; Gas insulation; Manufacturing; Power cable insulation; Power cables; Writing;
Journal_Title :
Electrical Insulation Magazine, IEEE
