Experimental study on the partial discharge and AC breakdown properties of C ₄ F ₇ N/CO ₂ mixture

Abstract

As an environmental friendly insulating medium, C 4 F 7 N has received extensive attention in the past two years. In this study, the partial discharge (PD) and breakdown characteristics of C 4 F 7 N/CO 2 gas mixture were investigated using the gas insulation performance test platform. The influence of gas pressure and mixing ratio on the PD initial voltage (PDIV) and breakdown voltage of C 4 F 7 N/CO 2 gas mixture in different electric fields was tested. It was found that the PDIV and breakdown voltage of gas mixture with 2-8% C 4 F 7 N in the highly non-uniform field showed a linear saturation increasing trend with the change of gas pressure and mixing ratio. The breakdown voltage of gas mixture increases linearly with gas pressure in the quasi-uniform electric field. The relative breakdown voltage of gas mixture in the highly non-uniform field under high-pressure conditions is inferior to those of low-pressure conditions. The C 4 F 7 N/CO 2 gas mixture containing 2-8% C 4 F 7 N is sensitive to the non-uniformity of electric field. According to the PD and breakdown tests results, C 4 F 7 N/CO 2 gas mixture with 2-8% C 4 F 7 N has the potential to replace SF 6 using in gas-insulated equipment.

Prediction of the Electrical Strength and Boiling Temperature of the Substitutes for Greenhouse Gas SF₆ Using Neural Network and Random Forest

“…To predict the impact on the environment, future work should be done to check the feasibility of introducing the RF. Additionally, the decomposition products of the larger molecules after discharge [50], which contains CF4 [51], should also be considered.…”

Influence of Oxygen on the Thermal Decomposition Properties of C4F7N–N2–O2 as an Eco-Friendly Gas Insulating Medium

“…14 In addition, the dielectric strength of the C 4 F 7 N gas mixture with 18–20% C 4 F 7 N can be achieved similar to that of pure SF 6 . 15 The insulation properties, 16−19 decomposition characteristics, 20−25 and material compatibility 26−28 of the C 4 F 7 N gas mixture have been deeply investigated over the past 3 years, confirming that the C 4 F 7 N–CO 2 or C 4 F 7 N–N 2 gas mixture has the potential to be used in all kinds of GIE.…”

Nanomaterials‐based gas sensors of SF 6 decomposed species for evaluating the operation status of high‐voltage insulation devices

“…Sulphur hexafluoride (SF 6 ), due to its superior chemically inert and dielectric strength, is widely applied as an insulator medium for arc-quenching in high-voltage insulation devices [1][2][3][4] such as gasinsulated switchgear of the power system [5,6]. These devices, however, in the long-running will be afflicted with the partial discharge (PD) generated around the sharp edges or small contaminant particles where the electric field is intensified [7][8][9].…”