Title :
Evaluation of ethylene-propylene rubber as electrical insulating material for a superconducting cable
Author :
Mizuno, Yukio ; Nagao, Masayuki ; Kosaki, Masamitsu ; Shimizu, Noriyuki ; Horii, Kenji
Author_Institution :
Dept. of Electr. & Electron. Eng., Toyohashi Univ. of Technol., Japan
fDate :
12/1/1992 12:00:00 AM
Abstract :
Mechanical and electrical properties of ethylene propylene rubber (EPR) pieces were studied in comparison with polyethylene (PE) in the cryogenic temperature region to examine the possibility of its use as solid electrical insulating material in superconducting cables. The mechanical properties of EPR are preferable to those of PE mainly because of its low shrinkage. The electric strength and dielectric loss tangent of EPR are comparable with those of PE at liquid helium temperature. Based on the encouraging results, an extruded EPR-insulated cable was fabricated and its 15-m length was cooled down to liquid helium temperature successfully. Partial discharge experiments at that temperature showed good electrical characteristics. This is a breakthrough in terms of the electrical insulation design of cryogenic cables
Keywords :
cable insulation; cryogenics; dielectric losses; dielectric measurement; environmental testing; insulation testing; materials testing; organic insulating materials; partial discharges; polymers; power cables; rubber; superconducting cables; 4.2 K; EPR; cryogenic cables; cryogenic temperature region; dielectric loss tangent; electric strength; electrical characteristics; electrical insulating material; electrical insulation; electrical properties; ethylene-propylene rubber; extruded EPR-insulated cable; mechanical properties; polyethylene; shrinkage; solid electrical insulating material; superconducting cable; Cable insulation; Cryogenics; Dielectric losses; Dielectrics and electrical insulation; Helium; Mechanical factors; Paramagnetic resonance; Rubber; Superconducting cables; Temperature;
Journal_Title :
Electrical Insulation, IEEE Transactions on
