C₄F₇N (2,3,3,3-tetrafluoro-2-(trifluoromethyl) propanenitrile) gas mixtures have emerged as a promising ecofriendly replacement for SF₆, the most global-warming-potent and widely used industrial gaseous dielectric in power grids. However, aging products of C₄F₇N gas mixtures with potential toxicity have also raised concerns. In this work, we demonstrate that by properly exploiting the heterogeneous characteristics of C₄F₇N aging, both its solid and gaseous aging products generated due to electric discharges can be effectively mitigated. With CO₂ as the buffer gas to prevent carbonization, FKM fluoroelastomer rubber as the gasket to hinder the polymerization, and 4A molecular sieves as the adsorbent to further fixate the residual aging products, benign C₂F₆ and CO at sufficiently low concentrations become the only aging products detected after the electrical aging of C₄F₇N gas mixtures. This work showcases effective abatement strategies of C₄F₇N aging products, thus facilitating the transition toward SF₆-free green power grids.

中文翻译：

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减少基于 C4F7N 的 SF6 替代品中老化产物的产生：整体方法

C ₄ F ₇ N（2,3,3,3-四氟-2-（三氟甲基）丙腈）气体混合物已成为 SF ₆的有前途的环保替代品，SF 6 是全球变暖最严重且广泛使用的工业气态电介质。电网。然而，具有潜在毒性的C ₄ F ₇ N气体混合物的老化产物也引起了人们的关注。在这项工作中，我们证明，通过适当利用C ₄ F ₇ N老化的异质特性，可以有效减轻其因放电而产生的固态和气态老化产物。以CO ₂作为缓冲气体防止碳化，FKM氟橡胶作为垫片阻碍聚合，4A分子筛作为吸附剂进一步固定残留的老化产物，足够低浓度的良性C ₂ F ₆和CO成为仅在C ₄ F ₇ N 气体混合物电老化后检测到老化产物。这项工作展示了C ₄ F ₇ N老化产品的有效减排策略，从而促进向无SF ₆绿色电网的过渡。