中国电机工程学报2022，Vol.42Issue(12)：4612-4622,中插31,12.DOI:10.13334/j.0258-8013.pcsee.211173
GIS用O形密封圈热压缩加速老化性能表征与劣化规律研究
Study on the Property Characterization and Degradation of GIS O-ring Seals Under Thermal Compression Accelerated Aging
摘要
Abstract
This paper analyzed the characterization and degradation of O-ring seals in gas-insulation substation (GIS) application. Two kinds of commercial ethylene-propylene- diene monomer rubber (EPDM) O-ring samples were used in the two-factor accelerated aging test of thermal and compression. The evolution of compression set (εt) and Shore A hardness (ht) were studied. The results show that, ht is well modeled by linear regression, and εt is well modeled by both exponential function model and power function model. The derivation of εt decreases with time, indicating a decreasing aging rate of EPDM O-rings under constant aging conditions. This is inconsistent with the conclusion of previous studies that the aging rate, characterized by oxygen consumption rate, should be constant when the aging temperature is constant. To give a reasonable explanation, the residual compression ratio (δt) was defined to study the remaining utility of the compressive aging factor during the aging of O-rings. Then, εt was normalized by δt to derive the compression set at unit residual compression ratio (∈t ). It was found that ∈t changed linearly with time. The derivation of ∈t was derived as a new index to analyze the aging rate, and it was basically unchanged. The findings indicate that the obvious decline of the compressive aging factor in the two-factor aging test is the main reason for the decrease of aging rate.关键词
O形密封圈/老化规律/压缩永久变形率/硬度/老化速率Key words
O-ring seals/degradation/compression set/hardness/aging rate分类
信息技术与安全科学引用本文复制引用
张智敏,郝艳捧,彭家豪,阳林,高超,王国利,周福升,李立浧..GIS用O形密封圈热压缩加速老化性能表征与劣化规律研究[J].中国电机工程学报,2022,42(12):4612-4622,中插31,12.基金项目
中国南方电网有限责任公司科技项目(SEPRI[2017]K1716B02).Project Supported by Science and Technology Project of China Southern Power Grid Corporation(SEPRI[2017]K1716B02). （SEPRI[2017]K1716B02）
