交/直流交联聚乙烯电缆的绝缘介电性能研究

Study on Dielectric Properties of AC/DC XLPE Cables

针对交/ 直流交联聚乙烯电缆受到外部环境的影响,导致其绝缘介电性能变差,以提高交/ 直流交联聚乙烯电缆的绝缘介电性能为目的,提出了交/ 直流交联聚乙烯电缆的绝缘介电性能研究。在制备交/ 直流交联聚乙烯电缆样品的基础上,表征了试验样品的性能,结果表明,在电流变化幅度小的情况下,交/ 直流交联聚乙烯电缆没有表现出介电弥散现象,随着电流变化幅度的增加,交/ 直流交联聚乙烯电缆介电参数也在增加,当电流变化幅度超过24% 时,低频区域中交/ 直流交联聚乙烯电缆的介电参数随电流变化幅度的增加而减少,高频区域中交/ 直流交联聚乙烯电缆的介电常数随电流变化幅度的增加而增加,但是当电流变化幅度超过24% 时,交/ 直流交联聚乙烯电缆介电常数的增加不明显。

The insulation and dielectric properties of AC/DC XLPE cables become worse due to the influence of external environmental conditions.In order to improve the insulation dielectric properties of AC/DC XLPE cables,the insulation dielectric properties of AC/DC XLPE cables are studied.Based on the preparation of AC/DC XLPE cable samples,the properties of the test samples were characterized.The results show that the dielectric dispersion of AC/DC XLPE cables is not observed under the condition of small current change range.With the increase of current variation range,the dielectric parameters of AC/DC XLPE cables also increase.When the current change amplitude is more than 24%,the dielectric parameters of AC/DC XLPE cables decrease with the increase of current variation range in low frequency region,while the dielectric constant of AC/DC XLPE cables increases with the increase of current variation range in high frequency region.However,the increase of dielectric constant of AC/DC XLPE cables is not obvious when the current change amplitude is more than 24%.