scholarly journals Influence of trace H2O and O2 on SF6 decomposition products under arcing conditions in electric power equipment

2019 ◽  
Vol 2019 (16) ◽  
pp. 1774-1777 ◽  
Author(s):  
Ren Yang ◽  
Mengyuan Xu ◽  
Chen Guan ◽  
Jing Yan ◽  
Yingsan Geng
Keyword(s):  
Electric Power ◽  
Power Equipment ◽  
Decomposition Products ◽  
Sf6 Decomposition

scholarly journals Low Cycle Fatigue Characteristics of Oxygen-Free Copper for Electric Power Equipment

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4237
Author(s):  
Takuma Tanaka ◽  
Togo Sugioka ◽  
Tatsuya Kobayashi ◽  
Ikuo Shohji ◽  
Yuya Shimada ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electric Power ◽  
Stress Amplitude ◽  
Low Cycle Fatigue ◽  
Ebsd Analysis ◽  
Fatigue Properties ◽  
Power Equipment ◽  
Cycle Fatigue ◽  
Fracture Surfaces ◽  
Heat Treated

The effect of heat treatment on tensile and low cycle fatigue properties of the oxygen-free copper for electric power equipment was investigated. The heat treatment at 850 °C for 20 min, which corresponds to the vacuum brazing process, caused the grain growth and relaxation of strain by recrystallization, and thus, the residual stress in the oxygen-free copper was reduced. The tensile strength and 0.2% proof stress were decreased, and elongation was increased by the heat treatment accompanying recrystallization. The plastic strain in the heat-treated specimen was increased compared with that in the untreated specimen under the same stress amplitude condition, and thus, the low cycle fatigue life of the oxygen-free copper was degraded by the heat treatment. Striation was observed in the crack initiation area of the fractured surface in the case of the stress amplitude less than 100 MPa regardless of the presence of the heat treatment. With an increase in the stress amplitude, the river pattern and the quasicleavage fracture were mainly observed in the fracture surfaces of the untreated specimens, and they were observed with striations in the fracture surfaces of the heat-treated ones. The result of the electron backscattered diffraction (EBSD) analysis showed that the grain reference orientation deviation (GROD) map was confirmed to be effective to investigate the fatigue damage degree in the grain by low cycle fatigue. In addition, the EBSD analysis revealed that the grains were deformed, and the GROD value reached approximately 28° in the fractured areas of heat-treated specimens after the low cycle fatigue test.

scholarly journals Mono- and Bi-Molecular Adsorption of SF6 Decomposition Products on Pt Doped Graphene: A First-Principles Investigation

2018 ◽  
Vol 8 (10) ◽  
pp. 2010 ◽  
Author(s):  
Yongqian Wu ◽  
Shaojian Song ◽  
Dachang Chen ◽  
Xiaoxing Zhang
Keyword(s):  
Single Molecule ◽  
First Principles ◽  
Density Functional ◽  
Energy Gap ◽  
Adsorption Parameters ◽  
Functional Theory ◽  
Decomposition Products ◽  
Before And After ◽  
Doped Graphene ◽  
Sf6 Decomposition

Based on the first-principles of density functional theory, the SF6 decomposition products including single molecule (SO2F2, SOF2, SO2), double homogenous molecules (2SO2F2, 2SOF2, 2SO2) and double hetero molecules (SO2 and SOF2, SO2 and SO2F2, SOF2 and SO2F2) adsorbed on Pt doped graphene were discussed. The adsorption parameters, electron transfer, electronic properties and energy gap was investigated. The adsorption of SO2, SOF2 and SO2F2 on the surface of Pt-doped graphene was a strong chemisorption process. The intensity of chemical interactions between the molecule and the Pt-graphene for the above three molecules was SO2F2 > SOF2 > SO2. The change of energy gap was also studied and according to the value of energy gap, the conductivity of Pt-graphene before and after adsorbing different gas molecules can be evaluated.

scholarly journals First-Principle Study of Rh-Doped Nitrogen Vacancy Boron Nitride Monolayer for Scavenging and Detecting SF6 Decomposition Products

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3507
Author(s):  
Zhen Shi ◽  
Sheng-Yuan Xia
Keyword(s):  
Boron Nitride ◽  
Sulfur Hexafluoride ◽  
Nitrogen Vacancy ◽  
First Principle ◽  
Density Of State ◽  
Decomposition Products ◽  
Status Assessment ◽  
Sf6 Decomposition ◽  
Computational Processes ◽  
Potential Use

The scavenging and detection of sulfur hexafluoride (SF6) decomposition products (SO2, H2S, SO2F2, SOF2) critically matters to the stable and safe operation of gas-insulated switchgear (GIS) equipment. In this paper, the Rh-doped nitrogen vacancy boron nitride monolayer (Rh-VNBN) is proposed as a gas scavenger and sensor for the above products. The computational processes are applied to investigate the configurations, adsorption and sensing processes, and electronic properties in the gas/Rh-VNBN systems based on the first-principle calculations. The binding energy (Eb) of the Rh-VNBN reaches −8.437 eV, while the adsorption energy (Ead) and band gap (BG) indicate that Rh-VNBN exhibits outstanding adsorption and sensing capabilities. The density of state (DOS) analysis further explains the mechanisms of adsorption and sensing, demonstrating the potential use of Rh-VNBN in sensors and scavengers of SF6 decomposition products. This study is meaningful as it explores new gas scavengers and sensors of SF6 decomposition products to allow the operational status assessment of GIS equipment.

scholarly journals Development of Gas Sensors for Detecting SF6 Decomposition Products and Locating Faults in GIS

1997 ◽  
Vol 117 (10) ◽  
pp. 526-531 ◽  
Author(s):  
Shigemitsu Okabe ◽  
Takahiro Ohno ◽  
Shiro Yamauchi ◽  
Tadao Minagawa ◽  
Mitsuhito Kamei ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Decomposition Products ◽  
Sf6 Decomposition

scholarly journals A DFT study on the adsorption of Ga-BNNT to SF6 decomposition products under partial discharge

2019 ◽  
Vol 14 ◽  
pp. 102419 ◽  
Author(s):  
Hai Qian ◽  
Jun Deng ◽  
Haibin Zhou ◽  
Xu Yang ◽  
Wei Chen
Keyword(s):  
Partial Discharge ◽  
Dft Study ◽  
Decomposition Products ◽  
Sf6 Decomposition

Research on the detection of SF6 decomposition products based on non-resonant photoacoustic spectroscopy

2015 ◽  
Vol 7 (3) ◽  
pp. 1200-1207 ◽  
Author(s):  
J. Luo ◽  
Y. H. Fang ◽  
Y. D. Zhao ◽  
A. J. Wang ◽  
D. C. Li ◽  
...  
Keyword(s):  
Light Source ◽  
Photoacoustic Spectroscopy ◽  
Low Cost ◽  
Infrared Light ◽  
Decomposition Products ◽  
Sf6 Decomposition ◽  
Selection Of

Using a low-cost infrared light source and a selection of narrowband filters, the non-resonant photoacoustic device is able to detect CO, SO2 and CF4 in SF6 down to a few ppm.

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