High Voltage Pulse Broken

The number of coal seams broken by high voltage pulse increased with increasing of applied voltage, and the formation of coal seam voids and cracks increased with the growth of electric pulse number and coal seam permeability through the microscopic observation. Further, it was noted that rock porosity, rock thickness, pulse energy, and other ...

In this orthogonal designed research, 27 indoor tests of high voltage pulse discharge (HVPD) for breaking concrete together with the determination of dynamic elastic modulus of concrete...

The ner the grain size of granite, the smaller the broken ratio coecient, and the better the crushing degree of HVEP. There is almost no dierence in the energy eciency of HVEP between granites ... (Li et al. 2018, 2019) established a high-voltage electrical pulse rock-breaking system and based on Kratel cylindri-cal channel model (Kratel 1996 ...

According to the researches of several scholars, the rock-breaking process of HVEI drilling can be specifically divided into four steps (Andres. 2010; Boev et al. 1997; Cho et al. 2014; Lisitsyn et al. 1999; Liu et al. 2022b): (I) The high-voltage pulse power supply applies a HVEI with the voltage rising time less than 500ns to the high-voltage ...

In this orthogonal designed research, 27 indoor tests of high voltage pulse discharge (HVPD) for breaking concrete together with the determination of dynamic elastic modulus of concrete based

• dV/dt: Too high pulse current • Moisture Failure Modes of High Voltage Film Capacitors. Poor Design for Intended Application • Too thin dielectric for Vr ... High Voltage Film Capacitors. Bio for Scott Franco • Bachelor of Science Degree in Physics from UMass, 1989.

A laboratory experimental system for high voltage pulse rock breaking is established based on a 0–80 kV EPD pulse generator. Three types of electrode bits are devised, namely, petal-structural, four-point-structural, and circular-ring-structural electrode bits. ... Unlike the broken pit created by the point-type electrode bit, both petal-type ...

After multiple discharges, the rock will be broken [7, 9]. This indicates that the distribution characteristics of the plasma path determine the distribution characteristics of stresses within the rock, and are closely related to the crushing efficiency of HPDT. ... the high-voltage pulse output by the pulse power supply is loaded onto the high ...

The principal work of the generator can be broken down into two main steps. First, potential difference up to 24 volts is applied across primary part of the winding of an autotransformer causing current to pass through it. ... The setup consists of a high-voltage pulse generator with a frequency control and a sealed chemically-resistant reactor ...

High pulse discharge breakage has a vast prospect as a fresh crushing mechanism for it has the capability to enhance the comminuting effect, however, the breaking mechanism is not yet well studied. In this orthogonal designed research, 27 indoor tests of high voltage pulse discharge (HVPD) for break …

The high-voltage pulse technique is considered as a promising method for rock fragmentation in rock engineering. Understanding the fracture modes and fragment distribution of rocks subjected to high-voltage pulses is thus essential. In this work, a circuit system for rock breaking by high-voltage pulses discharge was established. The fracturing effect on granite …

The utility model provides a high-voltage electric pulse drill bit and a rock breaking experimental device, wherein the high-voltage electric pulse drill bit is positioned right above a rock; the device comprises a plurality of negative electrodes, a fixed negative electrode sleeve for fixing the negative electrodes, a positive electrode, an insulating sleeve, a spring, an insulating handle ...

The wave source is located inside the solid, and the stress wave is formed after the energy is injected and propagated to the surroundings. The energy used for particle breakage is increased, and a better breakage effect is shown. For Fig. 6 (c), the particle is not broken under high voltage pulse, while it is classified as electrical breakdown ...

High voltage pulse (HVP) selective breakdown of mineral matter in coal samples. ... over 75% of probabilities were observed that the high-density particles broken and the low-density particles remained intact, resulting in distinct product size distributions of the two density groups. In the multi-particle tests to treat the as-received Coal B ...

With the continuous development of the geological engineering field, high-voltage electric pulse plasma rock-fracturing technology has become a research hotspot in recent years. It is now widely recognized that this …

High-voltage electric pulse rock-breaking technology has the potential to improve drilling speed significantly. Numerous mechanism studies and laboratory experiments have laid the foundation for ...

High-voltage electrical pulses effectively fracture deep hard rocks. Multi-electrode configuration effectively enhances rock fragmentation efficiency. Increasing voltage improves …

High-voltage electric pulse rock breaking is based on the principle of liquid electric effect (Yu et al., 2022).At present, most of the high-voltage electric pulse breaking technologies focus on the in-depth study of the rock-breaking mechanism, and to analyze the formation principle of the discharge channel in different solid media (Boev et al., 1997; Lee, 1954), the …

As a novel rock-breaking technology, the high-voltage electro pulse rock-breaking boring (EPB) technology has a broad prospect for high efficiency and low energy consumption …

The number of coal seams broken by high voltage pulse increased with increasing of applied voltage, and the formation of coal seam voids and cracks increased with the growth of electric pulse number and coal seam permeability through the microscopic observation. ... Then high-voltage pulse generator releases 10–100 J/cm to the channel ...

High-voltage electric pulse rock breaking is based on the principle of liquid electric effect (Yu et al., 2022). At present, most of the high-voltage electric pulse breaking technologies focus on the in-depth study of the rock-breaking mechanism, and to analyze the formation principle of the discharge channel in different solid media (Boev et al., 1997; Lee, 1954), the …

High-voltage pulse technology has been applied to rock excavation, liberation of microfossils, drilling of rocks, oil and water stimulation, cleaning castings, and recycling products like concrete and electrical appliances. In the field of rock mechanics, research interest has focused on the use of high-voltage pulse technology for drilling and cutting rocks over the past …

In order to study on effect of high voltage pulse electrode spacing on broken concrete physical performance, through four electrode spacing in the concrete crush test, analysis of electrode spacing effect on water absorption and loss rate of aggregate, particle size distribution, crushing value and surface roughness.

This work aims to investigate and analyse the mechanism of rock failure under high-voltage electropulses in order to evaluate and increase the efficiency of high-voltage pulse technology in geological well drilling, tunnel …

of High‑Voltage Electro Pulse Rock‑Breaking Jifeng Kang1 · Changping Li2 · Longchen Duan1 · Yibiao Xiao 1 · Ao Li1 Received: 15 February 2022 / Accepted: 8 November 2022 / Published online: 27 November 2022 ... broken down when the energy was large enough (Andres et al. 2001a, 2001b; Boev et al. 1997). Burkin et al. (2009a, b) estab-

A capacitive pulse high-voltage generator is used to excite the plasma channel, and U c is the voltage across the equivalent capacitor C. Trigger switch adopts a high-voltage solid-state switch or Marx trigger switch to ensure insulation. ... The broken ratio coefficient γ can evaluate the crushing degree of a single pulse of EPF, and the ...

The rock is broken by the stress generated by the expansion of the plasma channel, which is called HVEP rock-breaking, as depicted in Fig. 1 (b), ... With the loading of a high-voltage pulse, the energy in the plasma channel continues to accumulate and produces impact stress. Once it exceeds the limit value, the rock will be broken.

After multiple discharges, the rock will be broken [7,9]. This indicates that the distribution characteristics of the plasma path determine the distribution characteristics of stresses within the rock, and are closely related to the crushing efficiency of HPDT. ... the high-voltage pulse output by the pulse power supply is loaded onto the high ...

Pearson Electronics specializes in the design of high voltage pulse transformers. These transformers employ open construction and are intended to be used in high voltage insulating oil. ... This is broken into bubbles which end up in the …