Compatibility of a Gaseous Dielectric with Al, Ag, and Cu and Gas‐Phase Synthesis of a New N‐Acylamidine Copper Complex

Abstract

Herein we describe the compatibility of 2-(trifluoromethyl)-2,3,3,3-tetrafluoropropane nitrile, an insulating gas for gas-insulated equipment, with aluminum, silver and copper. In an autoclave metal samples, oxygen, the gaseous 2-(trifluoromethyl)-2,3,3,3-tetrafluoropropane nitrile and a small amount of water were mixed at elevated pressure and heated up to 225°C [a] 1989 for several weeks. When Cu was present a multi-step gas phase reaction occurred, and single crystals of a copper complex were isolated. The square planar copper(II) complex contains two perfluorinated N-acylamidine ligands. The structure of the complex was obtained by single-crystal X-ray diffraction. Scheme 1. Synthesis of copper complex 2 from nitrile 1.

Review on decomposition characteristics of eco-friendly gas insulating medium for high voltage gas insulated equipment

“…It was found that the gas-solid interface compatibility between C 4 F 7 N and copper was poor. The copper surface was corroded when the interface temperature was higher than 170 • C (as shown in figure 6(a)), and C 4 F 7 N decomposed and produced C 3 F 6 at 220 • C. Crystals precipitated on the copper surface after interaction (as shown in figure 6(b)) belonged to the N-acylamidine complex, as reported by Kessler [135]. Silver plating on the copper surface can effectively solve this incompatibility.…”

Eco-friendly gas insulating medium for next-generation SF6-free equipment

“…The ideal insulating gas should have excellent thermal, electrical stability. Generally, various early latent defects will inevitably be introduced into the GIE due to transportation, installation, maintenance [41,42] . In addition, early insulation faults such as partial discharge (PD) or partial overheating fault (POF) may also occur under long-term operation, which will lead to the decomposition of gas molecules and generate various by-products.…”

Experimental Study of Compatibility between the Eco-friendly Insulation Mixed Gas CF3SO2F/N2 and EPDM and CR Materials

“…However, in addition to the insulating properties of CF 3 SO 2 F/N 2 gas, it is also necessary to consider the material compatibility between gases and solid materials when considering the use of CF 3 SO 2 F/N 2 gas. − As sealing materials in the GIE, current rubber materials should be compatible with CF 3 SO 2 F/N 2 gas. Otherwise, it may cause gas leakage and cause insulation breakdown accidents.…”