Analysis of the dielectric properties of R410A Gas as an alternative to SF ₆ for high‐voltage applications

Abstract

Electric power industry is extensively using gas-insulated systems for the transmission and distribution of electrical energy. In high-voltage technology, the gas insulation is dominated by Sulphur-hexafluoride (SF 6) since the early 60th. It is a greenhouse gas and has long atmospheric lifetime. This paper proposes comparatively more environmental friendly R410 gas as an alternative to SF 6 for high-voltage applications. To validate the performance and theoretical concepts, it has been analysed experimentally. Buffer gases air and carbon dioxide were mixed with the base gas R410A to reduce the liquification temperature and global warming potential. Dielectric strength of R410A was tested for DC as well as AC voltage, results were compared with that of SF 6 and other alternatives available in literature, and the results were comparable. Insulation selfrecoverability test of R410A was performed and the synergistic effect of the mixed gases was calculated. Consequently, this work has discovered that R410A is the suitable alternative to SF 6 for high-voltage applications.

Investigation of Synthesis and Dielectric Properties of c-C4F8O With Its CO2/N2 Mixtures as SF6 Alternatives in Gas-Insulated Applications

“…However, high GWP of SF 6 limited its use in the electrical system. In addition, decomposition products of SF 6 were mainly highly toxic by-products, such as SO 2 F 2 , SOF 2 , SOF 4 , HF and S 2 F 10 [33], [34]. According to the Table 3, GWP of c-C 4 F 8 O was 8700, about one-third that of SF 6 with lower impact on the environment.…”

Influence regularity of O 2 on dielectric and decomposition properties of C 4 F 7 N–CO 2 –O 2 gas mixture for medium‐voltage equipment

“…Sulfur hexafluoride (SF 6 ) is currently widely used in gas-insulated transmission and distribution network in the power industry due to its great insulation and switching characteristics [1][2][3][4]. SF 6 is a strong greenhouse gas with the global warming potential (GWP) of 23,500 and atmospheric lifetime of 3200 years [5][6][7].…”

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].…”

“…Though techniques such as photoacoustic spectroscopy (PAS) and gas chromatography-mass spectrometer possess high sensitivity to detect these species [18,22], they are costly and more suitable for laboratory analysis rather than continuous online monitoring in real engineering. Increasingly, there emerges a new detecting method for SF 6 decomposed species, in which the sensing nanomaterials are employed and prepared as sensitive transducers to realise the detection of at least one of the targets gases, thus reflecting the PD activity in SF 6 . These nanomaterials, such as carbon nanotube (CNT) and the others in two-dimensional (2D) structure, usually have a large specific surface area, strong chemical activity and high carrier mobility, giving rise to their good reactivity with gas molecules [23][24][25][26][27][28][29].…”

“…In the meanwhile, the chemical gas sensors prepared based on these materials, as demonstrated, have many outstanding properties such as fast response, high sensitivity, appropriate working temperature and low cost [30][31][32][33][34]. In recent years, the application of nanomaterials-based gas sensors for detecting SF 6 decomposed species has been prevailingly studied, especially regarding the exploration of the new-emerged 2D nanomaterials which is greatly favoured by the scholars. However, there lacks a review summarising the recent signs of progress made by the researchers in this field and helping the scholars initially stepping into this field rapidly get the basic knowledge and exploit potential innovations.…”