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直流套管用固化环氧树脂绝缘材料的热老化特性研究

Research on the Thermal Aging Characteristics of Cured Epoxy Resin Insulating Materials for DC Bushings.

作者信息

Liu Daijun, Tong Xiaobang, Liu Libao, Chen Tao, Tang Jiarong, Tang Wenkai, Wang Liming, Cao Bin, Luo Zimin

机构信息

China Yangtze Power Co., Ltd., Beijing 100032, China.

Nanjing Electric High Voltage Bushing Co., Ltd., Nanjing 210046, China.

出版信息

Polymers (Basel). 2025 Apr 15;17(8):1064. doi: 10.3390/polym17081064.

DOI:10.3390/polym17081064
PMID:40284328
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12030393/
Abstract

High-temperature-resistant epoxy composites play a crucial role in enhancing the operational reliability and service life of devices such as DC bushings, which is of great significance for the long-term stable operation of ultra-high voltage and flexible power transmission and distribution systems. In this study, the epoxy composite was prepared, and long-term thermal aging tests were conducted at 250 °C and 270 °C. The changes in physical properties, electrical characteristics, and bending strength of epoxy composite were systematically investigated, and the thermal aging mechanism of these materials was elucidated. The experimental results revealed that with the progression of thermal aging, the epoxy composites exhibited volume shrinkage due to the breaking of chemical bonds. After 10 thermal aging cycles at 270 °C, the mass loss rate of the epoxy composite reached 20.52%. At 250 °C, the breakdown strength decreased by 9.9% compared to the unaged state. After aging at 250 °C and 270 °C, the volume resistivity decreased by a maximum of 53.75% and 76.94%, respectively, while the dielectric constant decreased by a maximum of 50.34% and 41.94%, respectively. After 10 aging cycles at 250 °C and 270 °C, the bending strength of the cured epoxy composite decreased by 39.79% and 53.91%, respectively. These findings provide valuable insights into the thermal aging characteristics of epoxy composites used in DC bushings and other electrical devices, offering a scientific basis for material selection and reliability assessment in high-voltage insulation applications.

摘要

耐高温环氧复合材料在提高直流套管等设备的运行可靠性和使用寿命方面发挥着关键作用，这对于超高压和柔性输配电系统的长期稳定运行具有重要意义。在本研究中，制备了环氧复合材料，并在250℃和270℃下进行了长期热老化试验。系统研究了环氧复合材料的物理性能、电气特性和弯曲强度的变化，并阐明了这些材料的热老化机理。实验结果表明，随着热老化的进行，环氧复合材料由于化学键的断裂而出现体积收缩。在270℃下进行10次热老化循环后，环氧复合材料的质量损失率达到20.52%。在250℃下，击穿强度比未老化状态降低了9.9%。在250℃和270℃下老化后，体积电阻率分别最大降低了53.75%和76.94%，而介电常数分别最大降低了50.34%和41.94%。在250℃和270℃下进行10次老化循环后，固化环氧复合材料的弯曲强度分别降低了39.79%和53.91%。这些发现为直流套管和其他电气设备中使用的环氧复合材料的热老化特性提供了有价值的见解，为高压绝缘应用中的材料选择和可靠性评估提供了科学依据。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/ce8d83428ad2/polymers-17-01064-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/3a6c74c7cbf9/polymers-17-01064-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/82f1b373f20d/polymers-17-01064-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/96e42ed5fdc9/polymers-17-01064-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/7a3fb4c18677/polymers-17-01064-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/ae7dcf596078/polymers-17-01064-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/a9ff18e8f7a2/polymers-17-01064-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/44a3e5f708cb/polymers-17-01064-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/25d7e5d63286/polymers-17-01064-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/9f80882a03df/polymers-17-01064-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/53b9b75d0730/polymers-17-01064-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/ce8d83428ad2/polymers-17-01064-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/3a6c74c7cbf9/polymers-17-01064-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/82f1b373f20d/polymers-17-01064-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/39ca7cb39e29/polymers-17-01064-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/c7f95d7748fd/polymers-17-01064-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/96e42ed5fdc9/polymers-17-01064-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/7a3fb4c18677/polymers-17-01064-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/ae7dcf596078/polymers-17-01064-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/a9ff18e8f7a2/polymers-17-01064-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/44a3e5f708cb/polymers-17-01064-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/25d7e5d63286/polymers-17-01064-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/9f80882a03df/polymers-17-01064-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/53b9b75d0730/polymers-17-01064-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bef/12030393/ce8d83428ad2/polymers-17-01064-g013.jpg

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