PDF
Full
Outline
In order to obtain the characteristic gases generated during the decomposition of cross-linked polyethylene (XLPE) at different stages under electrical and thermal factors to judge the degree of degradation, we systematically studied the gas production characteristics of XLPE under thermal field and electrical field through thermogravimetric-infrared (TG-IR) experiments, high-energy discharge gas production experiments, and molecular dynamics (MD) simulations based on reactive force field (ReaxFF). The results show that under the action of thermal field, XLPE primarily decomposes to generate ethylene, propylene, and long-chain hydrocarbons, accompanied by oxidation products such as CO and CO2. While under the action of electrical field, the characteristic gases are mainly acetylene and propyne, and distinct absorption peaks of propyne appear in the infrared spectrum under high-energy discharge. Molecular simulation further reveals the differences in decomposition pathways of XLPE under electric and thermal fields. Specifically, decomposition under the thermal field is dominated by end-group breakage, while the electric field accelerates free radical reactions and promotes the generation of highly unsaturated substances. Finally, a normalized characteristic gas infrared spectrum library is constructed through density functional theory (DFT) calculation. The gas production process is divided into different stages based on the turning point of thermogravimetric curve, the peak spectrum change temperature of gas infrared spectrum, and the molecular simulation trajectory time of the decomposition process. This study clarifies the characteristic gases of XLPE during electrical/thermal decomposition and the gas production mechanisms, which can provide a theoretical basis for the fault detection of XLPE cable based on gas infrared spectrum.
PDF
59
31
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
