Multifunctional generator of high-voltage microsecond pulses

Li, Hongda; Lukanin, Alexander; Tskhe, Alexander; Sosnovskiy, Sergey

doi:10.1016/j.elstat.2017.09.006

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…The discharge voltage can be controlled by the gap distance of the gap switch that is connected to the high-voltage line of the capacitor. The gap switch, which consists of two copper balls, is efficient and durable compared of other switches used for plasma blasting, such as gas, semiconductor and magnetic switches (Li et al, 2017). The disadvantages of the gap switch are that discharge voltages cannot be controlled precisely and may be not the same at each blast, although the gap distances are equal.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Laboratory-scale fracturing of cement and rock specimen by plasma blasting

Riu¹,

Jang²,

Lee³

et al. 2019

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Although hydraulic fracturing is the most commonly used method for fracturing of shale-gas-bearing rock, there are some problems with this method. As plasma blasting can fracture rock without these problems, laboratory-scale fracturing of cement and rock specimens by plasma blasting was performed to investigate the possibility of using this method in shale gas development. Specimens were fractured by plasma blasting under various stress conditions. First, specimens were fractured under uniform pressure, and the discharge energies required for fracturing and fracture development were investigated. As uniform pressure increased, the energy increased as a parabolic curve. Fewer fractures were developed as uniform pressure increased for the same discharge energy. Second, plasma blasting was performed for specimens subjected to three different stresses. Fractures both perpendicular and oblique to the minor stress direction were developed with a differential stress of 3 MPa; however, only fractures perpendicular to the direction of the minor stress were developed with an 8 MPa differential stress. More fractures with diverse directions were developed with the same stress conditions but higher energy. Several long fractures were developed by multiple low-energy blasts, the same result as for one highenergy blast. Proppants were injected effectively into fractures by plasma blasting, resulting in a hydraulic conductivity increase. In sandstone, the geological structure controlled the direction and characteristics of fracture development by plasma blasting. All these results indicate that plasma blasting can be a possible method for fracturing shale gas formation. However, more researches are necessary to apply this method in shale gas development in field.

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Section: Experimental Apparatusmentioning

confidence: 99%

Laboratory-scale fracturing of cement and rock specimen by plasma blasting

Riu¹,

Jang²,

Lee³

et al. 2019

Episodes

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show abstract

“…It is the hub of power grid and plays the role of interconnection and power exchange of power grid with different voltage levels.Trela et al discussed the progress in frequency response interpretation of these important equipment in the power grid and established a numerical model to reduce the time required for electromagnetic field analysis of hundreds of turns windings [1]. Ahour et al established an appropriate mathematical model, which could accurately simulate the transient behavior of windings [2]. In order to reduce the resistance loss caused by the skin effect and proximity effect in the highfrequency induction wireless transmission coil, Zhang et al established an impedance calculation model for the electromagnetic field and resistance loss of the double-layer composite conductor in the frequency range below 100 kHz [3].…”

Section: Introductionmentioning

confidence: 99%

Response Test of Power Transformer Windings Excited by Nanosecond Pulse

Liu

Hang

2021

DGAEJ

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At present, the detection of transformer winding deformation in the offline phase, in order to discover the small transformer winding deformation, realize the online monitoring, in this paper, using nanosecond pulse frequency response analysis method, the detection of transformer winding deformation is studied, the results show that the nanosecond pulse frequency response analysis method in the detection of transformer winding deformation with high reliability and sensitivity.In order to verify the repeatability of the method, the method was used again at a 30-day interval under the condition that the detection environment was basically unchanged. The ρ value was 0.9719 in the range of 1 kHz∼1 MHz.

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“…Various pulse power sources have now been developed due to the expanding fields of application [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The required conditions for pulse power sources differ according to applications.…”

Section: Introductionmentioning

confidence: 99%

High-voltage Pulse Generation Using Electrostatic Induction in Capacitor

Saiki¹

2019

IJECEC

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Pulse power sources can produce high temperature or high-density extreme conditions within a short time. They have been introduced to various fields such as those in laser, fusion research, the production of plasma, shockwaves in water, water treatment, and exhaust gas treatments. Various high voltage pulse sources using insulated-gate bipolar transistor (IGBT) semiconductors with high voltage resistivity have been used. Also, Marx bank circuit is well known as an instrument that produces voltage pulses with low repetitive rates. These instruments have several advantages. However, their problems are a complex structure, high cost, and excessive weight. A simple method of producing high voltage pulses with short rising times based on electrostatic induction in external capacitor used for pulse power applications is proposed. The circuit has a simple structure and contains a minimum number of parts, which makes the instrument small and light weight. In fact, the generation of sawtoothed high voltage pulses with short rising times and low repetitive rates of a few 100 Hz was successfully conducted in experiments. Theoretical analysis was simultaneously undertaken. The numerically calculated results for generating high voltage pulses were goodly consistent with the experimental ones. Moreover, it has been confirmed that amplification of the output voltage by electro-hydrodynamics (EHD) electricity generation using a jet flame resulted in higher voltage pulses, lower electricity consumption, and high repetition rates.

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Multifunctional generator of high-voltage microsecond pulses

Cited by 5 publications

References 17 publications

Laboratory-scale fracturing of cement and rock specimen by plasma blasting

Laboratory-scale fracturing of cement and rock specimen by plasma blasting

Response Test of Power Transformer Windings Excited by Nanosecond Pulse

High-voltage Pulse Generation Using Electrostatic Induction in Capacitor

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