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500 kV交流和直流交联聚乙烯电缆绝缘材料的热老化特性

Thermal Aging Properties of 500 kV AC and DC XLPE Cable Insulation Materials.

作者信息

Zhang Ling, Wang Zhaowei, Tian Jihuan, Meng Shaoxin, Zhou Yuanxiang

机构信息

State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute, Wuhan 430074, China.

State Key Laboratory of Power System Operation and Control, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China.

出版信息

Polymers (Basel). 2022 Dec 9;14(24):5400. doi: 10.3390/polym14245400.

DOI:10.3390/polym14245400
PMID:36559767
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9780958/
Abstract

Despite similar material composition and insulation application, the alternating current (AC) cross-linked polyethylene (XLPE) and direct current (DC) XLPE materials cannot replace each other due to different voltage forms. Herein, this work presents a systematical investigation into the effects of thermal aging on the material composition and properties of 500 kV-level commercial AC XLPE and DC XLPE materials. A higher content of antioxidants in the AC XLPE than in the DC XLPE was experimentally demonstrated via thermal analysis technologies, such as oxidation-induced time and oxidation-induced temperature. Retarded thermal oxidation and suppression of space charge effects were observed in thermally aged AC XLPE samples. On the other hand, the carbonyl index of DC XLPE dramatically rose when thermal aging was up to 168 h. The newly generated oxygen-containing groups provided deep trapping sites (~0.95 eV) for space charges and caused severe electric field distortion (120%) under -50 kV/mm at room temperature in the aged DC XLPE samples. For the unaged XLPE materials, the positive space charge packets were attributed to the residue crosslinking byproducts, even after being treated in vacuum at 70 °C for 24 h. Thus, it was reasoned that the DC XLPE material had a lower crosslinking degree to guarantee fewer crosslinking byproducts. This work offers a simple but accurate method for evaluating thermal oxidation resistance and space charge properties crucial for developing high-performance HVDC cable insulation materials.

摘要

尽管交流（AC）交联聚乙烯（XLPE）和直流（DC）XLPE材料具有相似的材料成分和绝缘应用，但由于电压形式不同，它们不能相互替代。在此，本工作对热老化对500 kV级商用AC XLPE和DC XLPE材料的材料成分及性能的影响进行了系统研究。通过氧化诱导时间和氧化诱导温度等热分析技术，实验证明AC XLPE中抗氧化剂的含量高于DC XLPE。在热老化的AC XLPE样品中观察到热氧化延迟和空间电荷效应的抑制。另一方面，当热老化达到168小时时，DC XLPE的羰基指数急剧上升。新生成的含氧基团为空间电荷提供了深陷阱能级（约0.95 eV），并在室温下-50 kV/mm的电场下，使老化的DC XLPE样品中产生严重的电场畸变（120%）。对于未老化的XLPE材料，即使在70°C真空处理24小时后，正空间电荷包仍归因于残留的交联副产物。因此，可以推断DC XLPE材料具有较低的交联度，以确保较少的交联副产物。本工作提供了一种简单而准确的方法，用于评估对开发高性能高压直流电缆绝缘材料至关重要的热氧化抗性和空间电荷特性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e27/9780958/23e1480b48c3/polymers-14-05400-g014.jpg
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