丙烯酸基缓冲层烧蚀缺陷修复液的修复效果研究

Study on repair effect of repair solution for ablation defect in acrylic based buffer layer

目前高压电缆缓冲层烧蚀缺陷缺乏有效的液体修复材料,导致高压电缆线路的烧蚀缺陷隐患无法被及时有效消除。本文制备了丙烯酸基缓冲层烧蚀缺陷液体修复材料,并对实际电缆缓冲层烧蚀缺陷进行了修复实验,研究了修复液中炭黑含量对缓冲层电性能修复效果的影响。结果表明:修复液涂层中炭黑质量分数为20%时,修复缓冲层的体积电阻率降低至新缓冲层的水平,且基本不随温度改变。结合微观形貌的表征,分析认为修复液在缓冲层的纤维表面重新形成炭黑涂层,使得原本不均匀的涂层与不导电颗粒物被涂层包覆,同时无纺布内侧烧蚀形成的连续阻水粉层重新被炭黑涂层覆盖,重建了缓冲层的电气连接,从而有效修复了缓冲层烧蚀缺陷。

At present,there is a lack of effective liquid repair materials for ablation defects in the buffer layer of high-voltage cables,resulting in the inability to timely and effectively eliminate the hidden dangers of ablation defects in high-voltage cable lines.In this paper,acrylic based buffer layer ablation defect liquid repair materials were prepared and repair experiments were conducted on actual ablation defects in cable buffer layer.The repair effect of carbon black content in repair solution on the electrical properties of the buffer layer was studied.The results show that when the mass fraction of carbon black in the repair solution coating is 20%,the volume resistivity of the repaired buffer layer decreases to the level of new buffer layer and basiclly remains unchange with temperature.Based on the characterization of micro morphology,it is analyzed that the repair solution forms a carbon black coating on the fiber surface of the buffer layer,covering the original uneven coating and non-conductive particles.At the same time,the continuous water blocking powder layer formed by ablation on the inner side of the non-woven fabric is repacked by the carbon black coating,rebuilding the electrical connection of the buffer layer,thus effectively repairs the erosion defects of the buffer layer.