SF6 concentration sensor for gas-insulated electrical switchgear

Paul, Th.; Porus, M.; Galletti, Bernardo; Krämer, Axel

doi:10.1016/j.sna.2013.11.024

Cited by 21 publications

(7 citation statements)

References 8 publications

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Section: Introductionmentioning

confidence: 99%

“…Over the past decades, sulfur hexafluoride (SF 6 ) has been widely used in gas-insulated switchgear (GIS) and other gas-insulated equipment owing to its excellent insulating and arc extinguishing properties . Even so, during the long-term running equipment, partial discharge (PD) frequently occurs due to the inevitable internal insulation defects. , Previous studies found that SF 6 insulation gas will decompose to low-fluorine sulfides (SF x , x = 1–5) under partial discharge. , These decomposed products would subsequently react with traces of gaseous O 2 and H 2 O existing in SF 6 -insulated equipment and form various characteristic decomposition products, including SOF 2 , SO 2 F 2 , SO 2 , etc. , The running stability of gas-insulated equipment can be greatly affected by the decomposition products of SF 6 , which may ultimately lead to the breakdown of the power system. , To ensure the strong insulation of SF 6 -insulated equipment, one of the effective approaches is to maintain the purity of the filled gas, that is, removing the decomposition products of SF 6 online. , Considering the large concentration and high chemical stability of SO 2 F 2 , it is urgent to find an effective adsorbent for its removal.…”

Section: Introductionmentioning

confidence: 99%

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Au Catalyst-Modified MoS₂ Monolayer as a Highly Effective Adsorbent for SO₂F₂ Gas: A DFT Study

Tao

Chen

et al. 2019

ACS Omega

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To ensure the stable operation of gas-insulated equipment, removal of SF 6 decomposition products of sulfur hexafluoride (SF 6 ) is one of the best methods. SO 2 F 2 is one of the typical decomposition products of SF 6 , while the Au-modified MoS 2 (Au–MoS 2 ) monolayer is a novel gas adsorbent. Therefore, based on the first-principles calculation, the adsorption properties of the SO 2 F 2 molecule on the Au–MoS 2 monolayer are calculated. Furthermore, the adsorption energy, charge transfer, and structure parameters were analyzed to obtain the most stable adsorption structure. These results indicate that all of the adsorption processes are exothermic. To better study the adsorption mechanism between the SO 2 F 2 molecule and the Au–MoS 2 monolayer, the density of states, the highest occupied molecular orbital, the lowest unoccupied molecular orbital, and electron density difference were obtained. At last, we conclude that the interaction between the SO 2 F 2 molecule and the Au–MoS 2 monolayer was chemisorption. This study provides a theoretical basis to prepare the Au–MoS 2 monolayer for the removal of SF 6 decomposition products.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Au Catalyst-Modified MoS₂ Monolayer as a Highly Effective Adsorbent for SO₂F₂ Gas: A DFT Study

Tao

Chen

et al. 2019

ACS Omega

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“…Sensors In order to monitor the thermodynamic properties of the gas mixture, a pressure-temperature-density (pTρ) measurement system, more thoroughly described in [16,17], was used. Measurements were performed at three heights (40 mm, 280 mm, 540 mm) from the bottom of the test object, shown in Fig.…”

Section: Bmentioning

confidence: 99%

Dielectric Withstand of a Mixture of Fluoroketone C5F10O and Air When Cooling Below its Dew Point

Lantz

Studniarek

Kalilainen

et al. 2023

IEEE Trans. Dielect. Electr. Insul.

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We investigate the temperature-dependence of the dielectric withstand of a specific gas mixture consisting of a C5-fluoroketone and air below its dew point. Both lightning impulse and AC dielectric withstand are investigated. Using standard testing techniques, it is found that the AC withstand stays constant until the dew point of the mixture and then decreases following the predicted withstand for the concentration of fluoroketone at the given temperature. On the contrary, when measuring the lightning impulse withstand using a common dielectric testing approach, one does not find a decrease but instead, in certain cases, an increase of the dielectric performance. We attribute this behavior to the charging droplets of the condensate fluoroketone after each dielectric breakdown event. Flipping the polarization of the lightning impulse after every breakdown event reestablishes the behavior seen with the AC stress application. Overall, these results confirm that the dielectric behavior of this alternative insulation gas for electrical devices is well understood and that the dielectric withstand at -40°C of a mixture specified for medium voltage applications down to -25°C still shows 80% of the dielectric withstand measured at the dew point.

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“…However, once GIS fails, it will pose a serious threat to the security of power system, which is a potential security hazard. [1,2] Therefore, it is very important to detect GIS faults, and maintain its normal operation in industrial production. In recent years, many researches have focused on the possible fault diagnosis of GIS equipment, trying to effectively avoid the fault problem of GIS equipment.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Sensing for SF₆ Decomposition Products by Ru–MoTe₂ Monolayer

Jiang

Long

et al. 2022

Physica Status Solidi (b)

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In this work, the adsorption of SF6 decomposition products (SO2, SOF2, and SO2F2) on Ru–MoTe2 monolayer is investigated based on density‐functional theory (DFT) calculations. The doping structure, band structure, adsorption structure, adsorption energy, charge transfer, density of states (DOS), and molecular orbital are analyzed to better analyze the interaction mechanism between gas molecules and Ru–MoTe2 system. In the results, it is shown that the conductivity of MoTe2 monolayer can be greatly increased by doping Ru atom. Pristine MoTe2 shows a weak adsorption capacity for SO2, SOF2, and SO2F2 gases, which belongs to physical adsorption. When Ru atom is doped on MoTe2, the adsorption capacity of the doping system for these three gases is obviously improved. The adsorption capacity of Ru–MoTe2 monolayer to the gases is ranked as SO2F2 > SOF2 > SO2. Moreover, the strong interaction between gas molecules and Ru–MoTe2 surfaces leads to the rise of the conductivity of all adsorption systems to varying degrees, and the degree of the rise of conductivity influenced by gas molecules is ranked as SO2F2 > SO2 > SOF2. Herein, a theoretical basis for the preparation of gas sensors or adsorbers based on Ru–MoTe2 is provided for detecting and absorbing SF6 decomposition products.

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SF6 concentration sensor for gas-insulated electrical switchgear

Cited by 21 publications

References 8 publications

Au Catalyst-Modified MoS₂ Monolayer as a Highly Effective Adsorbent for SO₂F₂ Gas: A DFT Study

Au Catalyst-Modified MoS₂ Monolayer as a Highly Effective Adsorbent for SO₂F₂ Gas: A DFT Study

Dielectric Withstand of a Mixture of Fluoroketone C5F10O and Air When Cooling Below its Dew Point

Adsorption and Sensing for SF₆ Decomposition Products by Ru–MoTe₂ Monolayer

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SF6 concentration sensor for gas-insulated electrical switchgear

Cited by 21 publications

References 8 publications

Au Catalyst-Modified MoS2 Monolayer as a Highly Effective Adsorbent for SO2F2 Gas: A DFT Study

Au Catalyst-Modified MoS2 Monolayer as a Highly Effective Adsorbent for SO2F2 Gas: A DFT Study

Dielectric Withstand of a Mixture of Fluoroketone C5F10O and Air When Cooling Below its Dew Point

Adsorption and Sensing for SF6 Decomposition Products by Ru–MoTe2 Monolayer

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Au Catalyst-Modified MoS₂ Monolayer as a Highly Effective Adsorbent for SO₂F₂ Gas: A DFT Study

Au Catalyst-Modified MoS₂ Monolayer as a Highly Effective Adsorbent for SO₂F₂ Gas: A DFT Study

Adsorption and Sensing for SF₆ Decomposition Products by Ru–MoTe₂ Monolayer