摘要： 在当前的电力传输系统中， 35 kV以下的电力电缆被广泛使用。这些电缆的外层保护结构，即电缆护套，经常会出现局部裂纹和损坏的情况，目前缺乏有效的现场修复技术，导致护套损坏的电缆往往需要整体更换，增加了维护时间和成本。针对这一问题，成功开发了一种满足使用标准的聚脲基涂料，将其直接涂覆在电缆护套的损坏区域，待固化成型后即可完成修复。该涂料具有以下特性：表干时间 ≤1 h，实干时间 ≤12 h；完全固化后，涂层的静态水接触角达到 127 °，拉伸强度达到 21 MPa，且 3 mm厚的击穿电压达到 56 kV，吸水率为 2. 7%，耐人工气候老化 720 h涂层无变化，断裂伸长率为 498%，耐磨性为 20 mg，可用于 35 kV以下配电电缆护套的现场修复。

关键词: 电缆护套, 聚脲涂料, 修复, 35 kV

Abstract: In the current power transmission system，cables below 35 kV are widely used. The outer protective structure of these cables，the cable sheath，is often subject to localizedcracking and damage. Due to a lack of effective on-site repair techniques，damaged cables often require full replacement，increasing maintenance time and costs. To solve this issue，a polyurea-based coating that meet usage standards has been developed. This coating can bedirectly applied to the damaged areas of the cable sheath，and the repair will be completed after curing and molding. Key characteristics include：surface drying within 1 hour，full drying within 12 hours；fully cured，the static water contact angle of the coating reaches 127 °，the tensile strength reaches 21 MPa，the breakdown voltage of 3 mm thick reaches 56 kV，the water absorption rate of 2. 7%，no changes after 720 hours of artificial climate aging，the fracture growth rate of 498%，and the wear resistance of 20 mg. This solution provides anefficient and reliable on-site repair method for distribution cable sheaths below 35 kV.

Key words: cable sheath, polyurea coatings, repair, 35 kV

中图分类号: 

• TQ635