Determination of Breakdown Voltage Along the Surface of a Cylindrical Insulator

Zhabin, Alexey; Ferron, Antoine Silvestre de; Rivaletto, Marc; Novac, B.M.; Pécastaing, Laurent

doi:10.1109/tdei.2022.3148469

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…[12]. Simulations using simultaneously PSpice and CST software have been performed to predict the output pulse shape and to optimise the mechanical structure of the generator [12,13].…”

Section: Marx Generatormentioning

confidence: 99%

A high‐power electromagnetic source for disabling improvised explosive devices

Ariztia,

Ibrahimi,

Zhabin

et al. 2024

High Voltage

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Ultra‐wideband (UWB) microwave sources driven by specialised pulsed power generators have experienced a considerable development in the last decade due to their wide domain of new applications such as defence or counter‐terrorism activity. The authors present the main findings of a research dedicated to the development of a pulsed power‐driven electromagnetic field source for disabling improvised explosive devices (IED). The pulsed power generator driving the source is a 13‐stage compact Marx producing voltage pulses reaching an amplitude of 0.5 MV, with a pulse repetition frequency (PRF) of up to 100 Hz. The generator is coupled to a bipolar pulse forming line, providing bipolar pulses with a dV/dt of around 1.6 MV/ns. This pulsed power system feeds an array composed of 16 Koshelev‐type UWB antennas through an impedance matching transformer. The resulting electromagnetic source is capable to produce pulsed electric fields (PEFs) having a figure‐of‐merit (FOM) of 1 MV. First, practical experiments were carried out to study the effects of the PEFs on targets. The targets used in the present study are M2B type flashbulbs, known to have the same susceptibility as the US army M6 detonator. Different configurations of wires (shielded, twisted, etc) with different lengths were used in connecting items inside these targets. The tests were performed by placing the flashbulbs at different distances to determine the essential parameters (i.e., amplitude, duration, and frequency range) of the PEFs required to trigger them. An overview of the experimental campaign and the main findings are also presented followed by conclusions.

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“…[12]. Simulations using simultaneously PSpice and CST software have been performed to predict the output pulse shape and to optimise the mechanical structure of the generator [12,13].…”

Section: Marx Generatormentioning

confidence: 99%

A high‐power electromagnetic source for disabling improvised explosive devices

Ariztia,

Ibrahimi,

Zhabin

et al. 2024

High Voltage

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“…One of the qualitative characterisation techniques for insulation coatings is the breakdown voltage (BV). It is defined as the threshold voltage at which the insulation starts to degrade and lose its insulating capacity [32]. BV being a function of coating thickness, studies have proven that for a positive voltage, an increase in the surface roughness leads to the decrease in the breakdown voltage of the coating [33].…”

Section: The Insulation Coatings 1) Powder Coatingmentioning

confidence: 99%

Fabrication of Insulation Coatings on Additively Manufactured CuCrZr Electrical Windings

Munagala,

Pang,

Hodgson

et al. 2024

IEEE Trans. Dielect. Electr. Insul.

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To lower the AC losses in electrical machines, additive manufacturing (AM) has been adopted to exploit the geometrical freedom in winding design. However, AM brings about new challenges such as surface roughness and porosity which can create difficulties for post processing of the windings such as applying insulation coatings. The paper investigates the influence of surface roughness (profile) of AM-processed CuCrZr as a potential candidate for electrical windings in terms of geometry, surface roughness, porosity, and oxidation on their insulation. The feasibility and characteristics of insulations applied via three processing techniques namely powder, spray and dip coating are compared. The entire process is quantified via techniques such as computed tomography, surface profilometry, optical microscopy, X-ray photon spectroscopy and breakdown voltage at different stages of the coating process. The study also includes coating on a commercial rectangular copper wire as a reference. The initial assessment of coatings concludes that surface roughness and the coating process are both vital determinants for the success of insulating AM components. Basic surface smoothening is needed to get rid of burs and spray coating technique was the best among others for its capability to produce conformal coating.

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“…A cylindrical dielectric piece of polyethylene is installed in a socket of the upper lid to avoid a breakdown between the HV output and the grounded metallic housing. Its dimensions were very carefully determined for avoiding surface flashover, with a dedicated study being presented elsewhere [20].…”

Section: Marx Designmentioning

confidence: 99%

“…Relationship between the overvoltage ratio and the prebreakdown delay. The points are representing data from [20], while the line represents a Gaussian fitting curve.…”

Section: A Sgs Modelingmentioning

confidence: 99%

Development and Test of a 500-kV Compact Marx Generator Operating at 100-Hz PRF

Zhabin

Lavrinovich

Ferron

et al. 2022

IEEE Trans. Plasma Sci.

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This article presents the electrical and mechanical design of a compact 13-stage 0.5-MV Marx generator operating at a pulse repetition frequency (PRF) of 100 Hz. The fast-switching process of the generator is based on spark gaps, operated under pressurized air and leading to the generation of an output pulsed voltage with a peak of 0.5 MV and a rise time of 15 ns when operated on a 300-load. Corona-stabilized electrodes are installed near the main gap of the switches to improve their operational stability and increase the PRF. To ensure compactness, the Marx generator is housed in a cylindrical metal vessel with a height of 92 cm and an outer diameter of 34 cm, having a total volume of 74 L. A highly accurate simulation using both PSpice and CST software packages was used to predict the impulse waveform at the output of the generator and to help in optimizing the generator design. The tests show a good agreement between the experimental data and the theoretical predictions.

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Determination of Breakdown Voltage Along the Surface of a Cylindrical Insulator

Cited by 8 publications

References 15 publications

A high‐power electromagnetic source for disabling improvised explosive devices

A high‐power electromagnetic source for disabling improvised explosive devices

Fabrication of Insulation Coatings on Additively Manufactured CuCrZr Electrical Windings

Development and Test of a 500-kV Compact Marx Generator Operating at 100-Hz PRF

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