Abstract Good environmental compatibility and excellent insulation performance make trifluoroiodomethane (CF 3 I) have the potential to replace SF 6 in gas-insulated equipment. The gas–solid of CF I, its main decomposed products (I 2 , C F 8 4 HF, H, COF ), molecule H O with Al Cu(111) surfaces is investigated based on first-principles calculations. most stable adsorption configurations adsorbed by all gas molecules are constructed, interaction types between two metal determined energy ( E...

Basin insulators in gas insulated switchgear (GIS) are prone to failure by partial discharge (PD). Insulation diagnosis using analysis method has advantages of strong anti-interference ability and high detection precision. This paper reports a new characteristic Carbonyl Sulfide (COS) for the PD epoxy GIS. The generation COS is verified experiments with trace technique. Experimental results indicate that generated only when intensity enough cause flashover on insulators. corresponding...

The AC insulation properties of C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> F xmlns:xlink="http://www.w3.org/1999/xlink">7</sub> N/CO xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> mixtures in non-uniform electric fields were investigated. optimized interval time between breakdowns for was determined a range field non-uniformity f. At high value f, the test results demonstrated some interesting dielectric behavior. breakdown...

Abstract Positive leaders branch less frequently than negative counterpart, and the physical processes properties of positive leader branching remain a mystery. We investigated 10 m laboratory discharges under four voltages using high‐speed video camera. differ from by either directly splitting or connecting with floating bidirectional to form branching, number branches shows correlation applied voltage, that is, branched channels increased 1 4 when voltage factor 1.5. Grounding points are...

C4F7N/CO2 mixed gas is one of promising alternative gases for SF6 in high-voltage equipment. The electrical insulation critical design the system. contradiction liquefaction temperature and strength requires a balanced mixing ratio pressure. synergistic effect key technique to optimize from aspect. In this paper, between C4F7N CO2 studied applied calculate content mixture. It found that coefficient related avalanche parameters pure gas. A graphic method based on Wieland approximation...

Predicting the insulation performance of SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> substitute gases through gas molecular structures has been a popular topic worldwide. There is lack research on relationship between critical reduced electric field and structure under low pressure. The intensity boiling temperature (BT) are used as inputs to extract important parameters (MSPs) at pressure by using maximum information coefficient...

The insulation properties of SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> /N xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> mixed gas are important for the design high-voltage equipment such as gas-insulated switchgear (GIS) and transmission line (GIL). However, influence temperature on performance under alternating current (ac) voltage is rarely studied. In this article, we did breakdown experiments with at temperatures...

C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</inf> F xmlns:xlink="http://www.w3.org/1999/xlink">7</inf> N/CO xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> is one of the most promising alternatives to SF xmlns:xlink="http://www.w3.org/1999/xlink">6</inf> in high-voltage electrical equipment such as gas insulated switchgear (GIS) because its excellent performance and low environmental impact. However, insulation characteristics still...

In order to study the synergistic effect of i-C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> F xmlns:xlink="http://www.w3.org/1999/xlink">7</sub> CN mixtures, were carried out power frequency breakdown experiments on 5%-20% F7CN/CO xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> and CN/N mixtures in uniform electric fields with pressures ranging from 0.1 0.7 MPa. Based density functional theory (DFT), configurations single...

To investigate the feasibility of replacing SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> in gas insulated transmission line (GIL) using eco-friendly gas, physical characteristics and dielectric strength potential alternative gases are compared this paper. These include c-C xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> F xmlns:xlink="http://www.w3.org/1999/xlink">8</sub> -N xmlns:xlink="http://www.w3.org/1999/xlink">2</sub>...

In this paper, the insulation strength of C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> F xmlns:xlink="http://www.w3.org/1999/xlink">7</sub> N/CO xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> with temperature is obtained by AC breakdown tests and theoretical calculations. The experimental results 9%C N/91%CO at 0.7 0.5 MPa pressures show that voltage changes nonlinearly temperature. Theoretical analysis shows nonlinear change...

Considering the long length of gas-insulated transmission lines (GILs), novel methods are required to alleviate impacts axial diffusion on decomposition products' monitoring. The process two typical products, SO2 and SO2F2, was studied. During experiments, SO2F2 were generated by partial discharges. Based Fick's law, an model proposed. By combining experiment simulation results, it found that coefficient greater than SO2F2. In addition, concentration variation at different positions would...

Predicting the insulation performance of SF6 substitute gases through gas molecular structures has been a popular topic worldwide. The difficulty is that relationships between structure and strength, global warming potential boiling temperature are not clear, general linear methods cannot be used to effectively extract key factors. Based on published parameters, grey correlation method factors affect dielectric in dynamic (non-linear) approach. Further, predict gases, regression with high...

Abstract The physical mechanism of leader formation and development is not well understood. In this study, we present experimental simulation results obtained with a 10 m long air gap discharge. A outdoor discharge experiment carried out to obtain the current, voltage, optical image during process. Four different impulse voltages were applied rod‐plane gap. measured current used as an input for plasma model, then temperature electric field could be calculated. show that streamer stem dark...

As a greenhouse gas with strong global warming potential, the use of SF6 needs to be reduced as much possible. Researching environmentally friendly insulation (EFI) gases replace in power electrical equipment is an effective way reduce its usage. CF3SO2F/N2, newly proposed EFI gas, has certain potential SF6. Compatibility CF3SO2F/N2 rubber sealing materials commonly used still unknown. In this article, compatibility ethylene-propylene-diene monomer (EPDM) and chloroprene (CR) was...

Abstract Exploring the gas-solid compatibility between insulating gas and solids materials used in electrical equipment is of great significance for determining long-term behavior trifluoromethanesulonyl fluoride (CF 3 SO 2 F). The CF F its decomposition products with Ag, Zn, ZnO common surfaces has been assessed based on first-principles calculations, SF 6 as control group. excellent solid by analyzing adsorption configurations, energies, charge transfer, height, density states, ab initio...