通过水针电极老化法加速XLPE电缆绝缘产生明显水树，采用一种硅氧烷修复液对水树老化XLPE电缆绝缘进行修复，比较了修复前后老化XLPE电缆绝缘的介损和直流泄漏电流，并通过显微镜和扫描电镜（SEM）对水树及其内部的填充物进行了观察。结果表明：修复液能扩散到水树内消耗水分，生成绝缘性能良好的填充物填充水树空洞，使介损和泄漏电流明显下降，绝缘性能逐渐恢复到接近老化前水平。利用修复液对老化样本绝缘进行修复，对现场运行老化电缆进行了绝缘修复实验表明，修复后电缆的介损和直流泄漏电流下降一半以下，显著提高了水树老化运行电缆的绝缘性能。
A water-needle electrode method was used to accelerate XLPE cables water tree aging, and a siloxane rejuvenation fluid was used to rejuvenate the water tree aged XLPE cables. The dielectric loss factor and leakage current of the aged XLPE cables before and after rejuvenation were compared, and the water tree and its filling compounds in the water tree voids after rejuvenation were observed by mi-croscope and SEM. The results show that the rejuvenation fluid can diffuse into the insulation to elimi-nate water and generate filling compounds with good dielectric properties, making the dielectric loss fac-tor and leakage current decrease significantly, the insulating properties recovery to the unaged level. Final-ly, the rejuvenation fluid was applied to rejuvenate the aged XLPE cables in service. The results show that the dielectric loss factor and leakage current of the aged XLPE cables after rejuvenation decrease to half below, and the insulating properties recovery significantly, inidcating that the siloxane fluid can in-crease the insulation properties of the water tree aged cables in service.
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