Cables are valuable assets, critical for ensuring the continued reliability of electric power delivery. XLPE cable systems have become increasingly ubiquitous, since their introduction in the 1960s. Improvements in the XLPE manufacturing technology resulted in the advent of tree-retardant XLPE (TRXLPE) type cables in the 1980s. Most of the distribution utilities have already either initiated or completed the process of replacing their old PILC cable infrastructure with polymeric type cables. However, the XLPE cable systems are still prone to accelerated aging due to water treeing and thermal aging effects. Water trees are bush-like structures that develop under service, specifically due to the presence of moisture [1]. Figure 1 shows the different densities of water tree formation in XLPE cables, from light to extremely large.

中文翻译：

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使用频域光谱法评估中压 XLPE 电缆状况

电缆是宝贵的资产，对于确保电力输送的持续可靠性至关重要。自 1960 年代推出以来，XLPE 电缆系统变得越来越普遍。XLPE 制造技术的改进导致在 1980 年代出现了阻燃 XLPE (TRXLPE) 型电缆。大多数配电公用事业公司已经开始或完成了用聚合型电缆替换其旧的 PILC 电缆基础设施的过程。然而，由于水树和热老化效应，XLPE 电缆系统仍然容易加速老化。水树是一种灌木状结构，在服务下发育，特别是由于存在水分[1]。图 1 显示了 XLPE 电缆中不同密度的水树形成，从轻到超大。