Ion Permeation in Compounds for the Power Cable Sheath

배전케이블 외피용 컴파운드의 이온투과 특성

Permeation of $Ca^{2+}$ ions in PVC and flame-retardant polyolefin (FR) compounds for the sheath of medium voltage underground cables was studied. At $70^{\circ}C$ ion permeation increases fast at times of up to a few tens of hour and then at a relatively slow rate. The first fast increase was attributed to the diffusion of ions in the samples while the second slow increase of ion permeation was attributed to the permeation of $Ca^{2+}$ ions through the samples. It was also found that the diffusivity of $Ca^{2+}$ ions in FR compounds is much higher than that in PVC compounds.