Zhang Xiaoxing, Wu Peng, Cheng Lin, Liang Sicong
School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan 430068, China.
School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China.
ACS Omega. 2021 May 12;6(20):13293-13299. doi: 10.1021/acsomega.1c01243. eCollection 2021 May 25.
Among the numerous novel eco-friendly insulating gases, CFN has attracted much attention due to its excellent electrical performance. However, except for the electrical perfomance, the compatibility between the gas medium and the sealing materials is equally important for gas-insulated equipment. At present, studies about the compatibility between CFN and EPDM, a widely used sealing material in power systems, are available in some previous works, but few focused on the compatibility comparison between CFN gas mixtures and EPDM with different third monomers. In this paper, we carried out the thermal aging test on ENB-EPDM, DCPD-EPDM, and CFN gas mixture to perfect the compatibility mechanism between EPDM and CFN. It was found that both of the EPDM reacted with the gas mixture and led to the property changes in the solid samples and the decomposition of CFN. On the other hand, by coating silicone grease, the contact between gas and rubber was effectively blocked and the concentration of the decomposition product was significantly reduced. The performance comparison indicates that ENB-EPDM is more suitable for sealing the CFN gas mixture, which is due to the superior thermal stability of ENB.
在众多新型环保绝缘气体中，CFN因其优异的电气性能而备受关注。然而，除电气性能外，气体介质与密封材料之间的兼容性对于气体绝缘设备同样重要。目前，先前的一些研究涉及CFN与三元乙丙橡胶（EPDM，电力系统中广泛使用的密封材料）之间的兼容性，但很少有研究关注CFN气体混合物与含不同第三单体的EPDM之间的兼容性比较。本文对亚乙基降冰片烯-三元乙丙橡胶（ENB-EPDM）、双环戊二烯-三元乙丙橡胶（DCPD-EPDM）和CFN气体混合物进行了热老化试验，以完善EPDM与CFN之间的兼容性机制。研究发现，两种EPDM均与气体混合物发生反应，导致固体样品性能变化以及CFN分解。另一方面，通过涂抹硅脂，有效地阻断了气体与橡胶之间的接触，显著降低了分解产物的浓度。性能比较表明，ENB-EPDM更适合用于密封CFN气体混合物，这是由于ENB具有更优异的热稳定性。
