Title :
Dielectric properties of ethylene-propylene rubber in cryogenic temperature region
Author :
Mizuno, Yukio ; Mitsuyama, Yasuichi ; Nagao, Masayuki ; Kosaki, Masamitsu
Author_Institution :
Nagoya Inst. of Technol., Japan
Abstract :
The effect of additives such as crosslinking agent and fillers on tan δ of ethylene-propylene rubber (EPR) was examined at temperatures between 4.2 K and 300 K. Thickness dependence of tan δ was also evaluated by using EPR films of different thickness and an extruded EPR insulated cable sample. The results show that additives increase tan δ of relatively thin EPR films even in cryogenic temperature region, whereas the thicker samples practical to cable insulation do not give intolerable dielectric loss. The remedy to tan δ increase due to the polymer contraction relative to shielding wires has been established
Keywords :
dielectric loss measurement; dielectric losses; ethylene-propylene rubber; insulation testing; low-temperature techniques; power cable insulation; 4.2 to 300 K; EPR films; additive effects; crosslinking agent; cryogenic temperature region; dielectric properties; ethylene-propylene rubber; extruded EPR insulated cable; fillers; polymer contraction; power cables; shielding wires; tan δ; thickness dependence; Additives; Cable insulation; Cable shielding; Cryogenics; Dielectric losses; Dielectrics and electrical insulation; Paramagnetic resonance; Rubber; Superconducting cables; Temperature dependence;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1994., Proceedings of the 4th International Conference on
Conference_Location :
Brisbane, Qld.
Print_ISBN :
0-7803-1307-0
DOI :
10.1109/ICPADM.1994.414050
