In this paper, an atmospheric-pressure dielectric barrier discharge is used to modify the surface of epoxy material and enhance dissipation charge reduce accumulation charge. experiments, air driven by a microsecond pulse generator. Surface properties before after plasma treatment are characterized water contact angle, potential, surface/volume conductivity measurements. Atomic force microscope X-ray photoelectron spectroscopy investigate changes morphology chemical composition surface....

Hydrophilic modification of polymethyl methacrylate (PMMA) surface is performed by atmospheric pressure plasma jet (APPJ) in Ar gas for improving the PMMA flashover performance vacuum. In experiments, APPJ driven a microsecond-duration pulsed generator, which has voltages 0-30 kV, rise time 300 ns and full width at half maximum 2μs. Characteristics are analyzed according to its voltage current waveform, discharge image optical emission spectrum. Furthermore, properties before after treatment...

Atmospheric-pressure gas discharge driven by high voltage pulses with fast rise-time and short duration has attracted significant attention for various plasma applications. In this paper, discharges were generated in a highly non-uniform electric field point-plane gaps open air four repetitive nanosecond-pulse generators repetition rate up to 1 kHz. The rise time of was 25 (generator #1), 15 #2), 3 #3), 0.2 ns #4) full width at half maximum 40, 30-40, 5, ns, respectively. experimental...

Nanosecond pulsed discharges have various discharge modes, such as corona, diffuse discharge, spark or arc. A dense is particularly desirable for applications at atmospheric pressure. In this paper, a magnetic-compression pulse generator was used to produce repetitive positive nanosecond pulses excitation of discharge. The output the had rise time about 25 ns and full width half maximum 40 ns. Electrical characteristics were studied by measuring its voltage current waveforms, well images...

Functionally graded materials (FGMs) exhibit unique properties and are expected to deliver outstanding stable performance under extreme conditions. High-voltage, high-power FGM-based electric insulation commonly fails because of inadequate surface charge control (flashover) stability stacked layers dielectric with permittivity εr. Here, we address these issues by interfacing the rutile anatase TiO2 on a ceramic very different εr values 110, 48, 9, respectively, using scalable,...

Biaxially oriented polypropylene (BOPP) films are the preferred storage dielectric for dry-type film capacitors due to excellent properties. However, evolution characteristics of dc breakdown BOPP in air remain unclear. This study focuses on influence curvature, contact area and material electrode films. The on- line/off-line measurements surface potential characterizations trap distribution achieved. And simulations charge, electric field, energy injection accomplished. path degradation...

The surface discharge phenomenon of polymers severely limits their applications in electrical and electronic devices, especially complex environments. In this study, a drift-diffusion model based on hydrodynamic approach was developed to investigate the influence humidity gas pressure negative discharge. results indicate that pattern did not change under different conditions. increased accelerated formation discharges pulse current. particular, as increased, tiny pulses occurred at tail...

An effective surface charge removal is critical to diverse applications of polymer and other soft organic materials in electrical devices systems. Here, we report on the application atmospheric pressure dielectric barrier discharge (AP-DBD) deposit SiOx thin films improve dissipation an epoxy resin surface. The nanofilms are formed at pressure, with replacement groups (C-H, C=O C=C) inorganic (Si-O-Si Si-OH) within layer. After plasma deposition, initial decreased by 12% was accelerated....

Abstract The surface flashover phenomenon across a vacuum-dielectric interface severely limits the service life and operational reliability of high voltage electrical equipment. Surface modification by atmospheric pressure plasma treatment is promising method to improve insulating performance polymers. In order explore mechanism processing on vacuum characteristics polymer materials, deposition was used treat polytetrafluoroethylene (PTFE) film. parameters under different conditions, such as...

Gliding discharges can generate nonthermal plasma at atmospheric pressure. Therefore, they are widely used in plasma-assisted ignition and combustion. In this paper, the gliding discharge sustained by a resonant ac power supply was obtained with pin-to-pin electrode geometry, characteristics of such were investigated through its voltage–current images. Inceptive, nonstable, stable stages involved studied. Experimental results showed that first ignited spark current peak tens amperes soon...

The surface charge accumulation on polymers can reduce the insulation performance of materials and even cause flashover. characteristics dissipation for epoxy resin (EP) exposed to various nanosecond pulse voltage parameters (i.e. rise time, width amplitude) are investigated. results show that fractional decay increases with time decreases amplitude. However, abnormal phenomenon appears when reaches 9 kV. Analysis suggests be attributed transport primarily along surface. Furthermore, is less...

Long‐time partial discharge (PD) is regarded as one of the main reasons for insulation failure high‐voltage cables. In this work, we report on application atmospheric pressure plasma to deposit siloxane film copper avoid PDs. The dielectric barrier (DBD) driven by AC power supply, with tetraethoxysilane (TEOS), argon, and oxygen mixture source gas. effect gas flow rate thin surface morphology, chemical composition, electrical properties studied systematically. Our results show that stability...

The free metal particles pollution has been a severe problem affecting the safety operation of gas insulated transmission lines (GIL) system and causes insulation failure. In this paper, facile film deposition method by using atmospheric pressure dielectric barrier discharge (AP-DBD) plasma was introduced. SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> deposited on copper surface to improve lift-off voltage particles. composition,...

The surface trap parameter can significantly affect the development of flashover in vacuum, but effective mode and mechanism are not very clear yet. parameters three polymeric materials were tested calculated by means isothermal potential decay. experiment was developed under different applied voltages. results show a positive correlation between withstand voltage deep trap, i.e., deeper energy level is, higher is. dynamics process charge trapping de-trapping analyzed based on transport...

The relation of desorbed gases and surface discharge in vacuum is a complex problem without reliable theory. experimental platform direct current nanosecond pulse source was built, the quadrupole mass spectrometer connected to cavity used analysis out-gassing characteristics insulation materials. Then experiments were done measured process. By comparing spectrum before discharges with ones after discharges, we obtained composition several Meanwhile analyzed probable sources different gases....

Surface flashover characteristics of insulation materials in vacuum are key factors to determine the behavior high voltage electrical equipment. Although surface has been investigated for decades, properties polymeric after repeated discharges have shown little attention by researchers. In order investigate aging caused flashovers vacuum, several typical were used microsecond pulses. The voltages obtained polytetrafluoroethylene, polymethylmethacrylate and polyamide thousands flashovers....

Both atmospheric pressure dielectric barrier discharge (AP-DBD) deposition and direct fluorination are effective methods to modify the surface electrical properties of polymer insulation. To investigate charge decay Al <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> O xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> -filled epoxy resin (ER) prepared by AP-DBD treatments, before after drying, samples were studied under various treatment...

The audible noise (AN) production mechanism caused by corona discharge in ultrahigh voltage transmission lines is less understood. study on sound pressure characteristic necessary to obtain the inherent relation between AN and discharge. In this paper, experimental research single-point direct current (dc) was evolved time-domain waveform obtained using capacitor microphone. experiment results show that dc comprises multiple subsequent pulses. electrode polarity have a effect rising time...

Partial discharges (PD) in the insulation of power equipment have been a focal point field electrical technology. Numerical simulation PD is an important approach to knowing mechanics. In this paper, physical model voids was modified and circuit built using Simulink. The simulations epoxy resin samples with single void double were investigated, respectively. discharge voltage waveforms, current waveforms obtained by simulation. At same time, we measured pulse time-domain ultra-wideband...

This paper describes experimental studies of the dependence X-ray intensity on anode material in nanosecond high-voltage discharges. The discharges were generated by two nanosecond-pulse generators atmospheric air with a highly inhomogeneous electric field tube-plate gap. output pulse first generator (repetitive generator) has rise time about 15 ns and full width at half maximum 30–40 ns. second (single 0.3 1 electrical characteristics emission discharge are studied measurement...

This work presents experimental results on different discharge modes for microsecond-pulse gliding discharges and their transition, then analyzes the effect of gap distance flow rate modes. The current amplitude, energy consumption per pulse voltage range are used to reflect some characteristics show that there three discharges, i.e. corona, diffuse spark. Among modes, values amplitude corona mode lowest, spark accordingly. When spacing is smaller than 5 mm, no mode, directly transit with...