【摘要】 氢气作为电缆缓冲层缺陷的关键特征气体，研究其产生与扩散特性对缺陷检测和定位具有重要意义。为此搭建110 kV交联聚乙烯电缆缓冲层气体检测系统，通过注水受潮试验模拟氢气的产生，并研究氢气的时空分布规律。试验表明：注水前及注水量1 mL未检测到氢气，而注水量5 mL下氢气在第5日出现并持续至第56日；氢气扩散呈现非均匀扩散特性，注水后第20日，氢气从注水位置至1.0 m位置的平均扩散速率为0.84 m/h, 1.0 m位置至1.9 m位置的氢气扩散速率降至0.09 m/h,至第56日，这2段的氢气扩散速率分别衰减至0.12 m/h和0.056 m/h。解剖试样分析发现，在阻水带及铝护套内侧存在典型白色粉末，证实受潮引发铝护套腐蚀析氢机制。研究结果可为电缆缓冲层缺陷的氢气时空分布检测和定位提供实验依据。更多还原

【Abstract】 As a key characteristic gas of cable buffer layer defects, the study of hydrogen generation and diffusion behavior is crucial for defect detection and localization. Therefore, a gas detection system for 110 kV cross-linked polyethylene(XLPE) cable buffer layer was established, and the generation process of hydrogen was simulated through the cable water-injection experiment, and the laws of hydrogen diffusion was studied. The experimental results show that hydrogen is not detected before water injection and at 1 mL injection volume. At 5 mL injection, hydrogen emergence initiated on day 5 and persisted through day 56, exhibiting non-uniform diffusion dynamics. The average diffusion rate of hydrogen from the point of water injection to 1 m on the 20th day after water injection is 0.84 m/h, and it decreases to 0.11 m/h in the section from 1 m to 1.9 m, and then decays to 0.12 m/h and 0.056 m/h in the section from the 56th day respectively. Analysis of the dissected specimens revealed the presence of typical white powder in the water blocking tape and the inner side of the aluminum sheath, confirming the mechanism of hydrogen precipitation from moisture-induced corrosion of the aluminum sheath. The study provides experimental evidence for detecting and locating the spatiotemporal distribution of hydrogen gas in cable buffer layer defects.更多还原