This article presents the effect of thermal aging on threshold field strength and relative permittivity of cross-linked polyethylene (XLPE) with different cross-linking agent contents. Here, low-density polyethylene (LDPE) and dicumyl peroxide (DCP) are used as basic experimental material and cross-linking agent, respectively. Eventually, experimental results indicate that thermal aging can gradually make threshold field strength and relative permittivity of XLPE with different DCP contents increase and decrease, respectively. Besides, threshold field strength of XLPE with different DCP contents increases first and then decreases as the increase of DCP content, while relative permittivity of XLPE with different DCP contents decreases first and then increases as DCP content increases at different thermal aging time, etc. These studies in this article are the basis of the research on space charge accumulation and dissipation inside XLPE materials, which are of great significance to the normal operation of XLPE cables.

本文介绍了热老化对具有不同交联剂含量的交联聚乙烯 (XLPE) 的阈值场强和相对介电常数的影响。在这里，低密度聚乙烯 (LDPE) 和过氧化二异丙苯 (DCP) 分别用作基本实验材料和交联剂。最终，实验结果表明，热老化可以逐渐使不同 DCP 含量的 XLPE 的阈值场强和相对介电常数分别增大和减小。此外，不同DCP含量的XLPE阈值场强随着DCP含量的增加先增大后减小，而不同DCP含量的XLPE的相对介电常数在不同的热老化时间随DCP含量的增加先减小后增大等。