High-voltage pulsed generator for dynamic fragmentation of rocks

Kovalchuk, B. M.; Kharlov, A. V.; Vizir, V.A.; Kumpyak, V. V.; Zorin, V.B.; Kiselev, V. N.

doi:10.1063/1.3497307

Cited by 55 publications

(16 citation statements)

References 14 publications

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“…Eventually, a high-voltage pulse with a certain pulse width will be generated on the load. The synchronization performance of the Marx generator is determined by the synchronization of the high-voltage pulse switch [26,27].…”

Section: The Shockwave Model Of High-voltage Epb In Granitementioning

confidence: 99%

Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

Duan

Tan

et al. 2019

Energies

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High-voltage electro pulse boring (EPB) has the advantages of high rock-breaking efficiency and good wall quality, and is a new and efficient potential method of rock breaking. The EPB process is defined as random because it is affected by many factors. At present, there is no suitable physical and mathematical model to describe the process and results of rock breakage in EPB, and the conclusions reached regarding rock-breakage mechanisms are not uniform. In this study, a complete damage model of high voltage EPB in granite is established, which includes a shock wave model and a damage model of high voltage EPB in granite. The damage model is based on the Particle Flow Code two-dimensional program. Use of a damage model of EPB accommodates the complete process of high voltage EPB, from discharge to production of a shock wave, and so rock-breaking via electro pulse can be simulated and calculated. The time-varying waveforms of shock waves with different electrical parameters are simulated and calculated on the basis of the model. Different shock wave forms are loaded into the surface and internal rock in the damage geometric model of EPB granite. Then, the breakage process of the rock surface and internally, and the mechanism of rock breakage using EPB are analyzed. This study provides a scientific basis for the quantitative expression and prediction of rock fragmentation in EPB in order to improve the drilling efficiency and reduction of energy loss in the process of EPB.

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Section: The Shockwave Model Of High-voltage Epb In Granitementioning

confidence: 99%

Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

Duan

Tan

et al. 2019

Energies

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“…After switch S responds, a current pulse arises in active load R. Such circuits are applied, for example, in fragmentation of solid materials by electrical break down [10,11]. In these systems, the resistance of the load (spark channel produced by electrical break down) is small compared with the impedance of the external electrical circuit; therefore, the discharge current oscillates.…”

Section: Test Bench and The Designmentioning

confidence: 99%

“…Today, increased interest in spark gaps switching high energies, which are used, specifically, for techno logical purposes, is observed [10,11]. In our previous work [12], we suggested a spark gap switch intended for a voltage of 300 kV and a switched energy of up to 450 J at a pulse rate of up to 10 Hz.…”

Section: Introductionmentioning

confidence: 99%

Operating stability of a self-breakdown spark-gap frequency switch rated at a voltage of 300 kV and a switched power of up to 450 J

et al. 2014

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A test bench for studying two electrode spark gaps rated at a voltage of 300 kV and a pulse repeti tion rate of up to 10 Hz and operating in air at elevated pressure. The typical time of pulse charging of a capac itive storage in the bench equals about 100 μs. The object of investigation is a spark gap the operating stability of which at a level of 10% of the rate voltage is achieved by initiating a corona discharge at the prebreakdown stage. It is shown that unstable operation is due to the accumulation of nitrogen oxides in the gap. To maintain the oxide content at an acceptable level, continuous gas purging is applied and necessary gas flow rates are estimated.

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“…The generator mainly consists of high-voltage pulse supply and controller. 15 The latter provides control signal to command the former to provide high voltage pulses with a certain amplitude, width and frequency. A circuit diagram of the supply is shown in figure 2.…”

Section: High-voltage Pulse Generatormentioning

confidence: 99%

Discharge characteristics of high voltage pulses inside rocks with increasing their applied number

Zhang

Liu

et al. 2017

AIP Advances

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By conducting experiments for granite and sandstone samples under different conditions, such as voltage amplitude and electrodes gap, the discharge characteristics of high voltage pulses inside the rocks with increasing their applied number have been investigated. In each of the experiments, a certain value for voltage amplitude and electrodes gap is set separately and then, pulses are applied on same surface of the rocks continuously. The time dependent voltage between the electrodes, the current in plasma and the transient states around the electrode tips are measured and recorded separately when each of the pulses is applied. By means of the wave forms of the voltage and the current, variation laws of the discharging time and the energy release into the plasma with increasing applied pulses number have been obtained. The relation between the number of applied pulses and the critical condition of discharge inside of the rocks has been found. Further, the relation between the number of applied pulses required to discharge and the voltage amplitude has been also analyzed. The reasons of why increasing applied pulses number has such effects on discharge characteristics of them inside the granite and sandstone samples have been found and demonstrated.

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High-voltage pulsed generator for dynamic fragmentation of rocks

Cited by 55 publications

References 14 publications

Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

Operating stability of a self-breakdown spark-gap frequency switch rated at a voltage of 300 kV and a switched power of up to 450 J

Discharge characteristics of high voltage pulses inside rocks with increasing their applied number

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