Title :
Dielectric insulation characteristics of liquid-nitrogen-impregnated laminated paper-insulated cable
Author :
Suzuki, Hiroshi ; Ishihara, Kaoru ; Akita, Shirabe
Author_Institution :
Central Res. Inst. of Electr. Power Ind., Yokosuka, Japan
fDate :
10/1/1992 12:00:00 AM
Abstract :
The electrical characteristics and insulation design strength of liquid-nitrogen-impregnated synthetic insulation were considered. The impregnation of liquid nitrogen into insulation paper can be monitored by measuring the electrostatic capacitance of the cable. ∈ tan δ, an index of the dielectric loss, was 0.31% for cellulose paper and 0.18% for semisynthetic paper, polypropylene laminated semisynthetic paper, and biaxially oriented polypropylene laminated paper. It was found that the decline of the thickness dependence of the breakdown strength of the liquid-nitrogen-impregnated insulating cable was steeper than that of the oil-filled cables. It is possible to design the insulation strength of the 66 kV cable to be 10 kV/mm
Keywords :
cable insulation; dielectric losses; insulation testing; organic insulating materials; paper; polymers; power cables; 66 kV; biaxially oriented polypropylene laminated paper; cellulose paper; dielectric insulation; dielectric loss; electrical characteristics; electrostatic capacitance; insulation design strength; liquid-nitrogen-impregnated laminated paper-insulated cable; oil-filled cables; polypropylene laminated semisynthetic paper; semisynthetic paper; Cable insulation; Capacitance measurement; Dielectric liquids; Dielectric loss measurement; Dielectric losses; Dielectrics and electrical insulation; Electric variables; Monitoring; Nitrogen; Oil filled cables;
Journal_Title :
Power Delivery, IEEE Transactions on
