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The influence of O2 on SF6 decomposition byproduct formation in spark discharge based on oxygen isotope tracer

2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2016

Sulfur hexafluoride (SF6) is one of the most commonly used insulating mediums in high-voltage electrical equipment. It is known that SF6 can decompose to lower fluorides of sulfur under electrical discharge, and then these lower fluorides of sulfur will oxidize in the presence of water vapor and oxygen, resulting in the formation of decomposition by-products. Among electrical discharge, spark discharge ...


Detecting Decompositions of Sulfur Hexafluoride Using MoS2 Monolayer as Gas Sensor

IEEE Sensors Journal, 2019

The adsorption and gas sensing properties of monolayer MoS2 to five kinds of sulfur hexafluoride decompositions (SO2, SOF2, SO2F2, H2S, HF) were explored using the density functional theory combined with the nonequilibrium Green's function. The adsorption energy, electron transfer, charge density difference configurations, current-voltage (I-V) character using a two-electrode based device and transmission coefficient have been discussed. The results show ...


Control and Monitoring

Gas Insulated Substations, None

This chapter covers monitoring topics including gas monitoring, partial discharge measurements, and circuit breaker monitoring. The control topics of bay controllers and control schemes are also covered. A special topic, related to digital monitoring in substations, is also discussed. The chapter covers the types of defect causing partial discharges, and gives information on partial discharge measuring methods, where electric and ...


Finite element induction plasma modelling

IEEE Conference Record - Abstracts. 1992 IEEE International Conference on Plasma, 1993

None


Spectrometric analysis of sulphur hexafluoride during an electrical discharge

1982 IEEE International Conference on Electrical Insulation, 1982

In order to better understand breakdown mechanisms and to determine the decomposition products of sulphur hexafluoride, a time-, space-, wavelength- resolved spectroscopic technique is used. Initial results derived from spectrometric analysis of sulphur hexafluoride discharges are presented and discussed.


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  • The influence of O2 on SF6 decomposition byproduct formation in spark discharge based on oxygen isotope tracer

    Sulfur hexafluoride (SF6) is one of the most commonly used insulating mediums in high-voltage electrical equipment. It is known that SF6 can decompose to lower fluorides of sulfur under electrical discharge, and then these lower fluorides of sulfur will oxidize in the presence of water vapor and oxygen, resulting in the formation of decomposition by-products. Among electrical discharge, spark discharge is one of the most common faults, often induced by the poor contact of fixed metal shield or switch contacts. This paper proposes a method based on oxygen isotope tracer to observe the variations and to analyze the formations of the oxyfluorides, such as SO2F2, SOF2, and SO2. By injecting different concentrations of 18O2, a series of spark discharge experiment is carried out. Then, the concentration ratios of the oxyfluorides are analyzed, under different concentration ratios of 18O2 to 16O2 ([18O2]/[16O2]). Finally, the formation mechanisms of the oxyfluorides are discussed based on the experiments.

  • Detecting Decompositions of Sulfur Hexafluoride Using MoS2 Monolayer as Gas Sensor

    The adsorption and gas sensing properties of monolayer MoS2 to five kinds of sulfur hexafluoride decompositions (SO2, SOF2, SO2F2, H2S, HF) were explored using the density functional theory combined with the nonequilibrium Green's function. The adsorption energy, electron transfer, charge density difference configurations, current-voltage (I-V) character using a two-electrode based device and transmission coefficient have been discussed. The results show that the adsorption of SO2 brings the largest adsorption energy as well as electron transfer. According to the simulated device, the unique negative conductance phenomenon was found for SO2. The MoS2 monolayer-based sensor has the highest response to SO2 when the bias voltage is 1.2 V, reaching 7.74 and has the largest response to H2S when 1.8 V. The transmission spectrum analysis shows that after introducing different gas molecules, the transmission coefficient has different changes in different energy ranges. This paper can provide a theoretical basis for designing MoS2 monolayer-based gas sensing device to detect the decompositions of sulfur hexafluoride or other specific gases.

  • Control and Monitoring

    This chapter covers monitoring topics including gas monitoring, partial discharge measurements, and circuit breaker monitoring. The control topics of bay controllers and control schemes are also covered. A special topic, related to digital monitoring in substations, is also discussed. The chapter covers the types of defect causing partial discharges, and gives information on partial discharge measuring methods, where electric and acoustic, chemical specific strategies of partial discharge monitoring with GIS are explained. It explains current and voltage or potential transformer wiring including a mimic diagram and the function of the bay controller with all its basic functions. Control schemes of different mode selections and interlockings are given and examples are shown. The chapter explains basic digital communication standards and their relations to other standards. It defines switchgear related communication standards of GIS, and explains the locations of the controls in the GIS and their timing operations.

  • Finite element induction plasma modelling

    None

  • Spectrometric analysis of sulphur hexafluoride during an electrical discharge

    In order to better understand breakdown mechanisms and to determine the decomposition products of sulphur hexafluoride, a time-, space-, wavelength- resolved spectroscopic technique is used. Initial results derived from spectrometric analysis of sulphur hexafluoride discharges are presented and discussed.

  • Theoretical Study of Monolayer PtSe2as Outstanding Gas Sensor to Detect SF6Decompositions

    We adopted density functional theory combined with non-equilibrium Green's function to investigate monolayer PtSe2's gas sensing properties and adsorption of five types of SF6decompositions (SO2, SOF2, SO2F2, H2S, and HF), and explore the response of a simulated monolayer PtSe2-based device to these gases. We discussed the adsorption configurations, adsorption energy, electron transfer, electron localization function, density of states (DOS) including the chemical interactions, and the current-voltage property. These observations were relevant in studying the device response to different gas molecules. Changes in the molecule orbitals in DOS could approximately evaluate the chemical interactions among the gas molecules to a certain extent. Changing the bias voltage could adjust the response of the device to different gas molecules. Ultra-thin PtSe2can be a promising gas sensing material in detecting SF6decompositions.

  • A Generalized Thermodynamic Model Of SF6 Including Analytical Pressure Dependence

    None

  • IEE Colloquium on 'Current Environmental Applications of Electrostatic Precipitations' (Digest No.118)

    None

  • Bibliography of switchgear literature: IEEE committee report

    This bibliography of 255 references was prepared by the Recognition and Planning Subcommittee of the IEEE Power Engineering Society Switchgear Committee to be used as a reference for switchgear education. The references generally cover the period of mid-1983 through mid-1988. The last complete switchgear bibliography was published in 1984 covering the period through September of 1983. This reference is updated at five-year intervals.<>

  • Other Topics

    This chapter includes subjects that are related to Gas Insulated Substations (GIS). Environmental Life Cycle Assessment is increasingly important in view of total life cycle assessment and the environmental impact assessment of the product during its entire life cycle, the commissioning and decommissioning processes and with consultations with authorities. Life cycle cost analysis is of relevance to initial purchasing when searching for the best and most economical solution. The chapter discusses the effects and influences of insulation coordination, and explains the impact of overvoltages and the grounding system. It examines the very fast transient (VFT) voltages and transient enclosure voltages (TEVs) for GIS, and details the planning issues for the project scope development. The chapter also explains the health and safety impact of GIS. The electric field in operation and during short circuit of GIS is also described.



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