scholarly journals IMPROVING THE EFFICIENCY OF HIGH-VOLTAGE ELECTRIC DISCHARGE INSTALLATIONS WHICH USE EXOTHERMAL DISPERSED MEDIA

2019 ◽  
Vol 2019 (5) ◽  
pp. 77-82
Author(s):  
O.I. Vovchenko ◽  
◽  
L. Yu. Demydenko ◽  
O.D. Blashchenko ◽  
I.M. Starkov ◽  
...  
Keyword(s):  
Electric Discharge ◽  
High Voltage ◽  
Dispersed Media

scholarly journals High Voltage Electric Discharge for Recovery of Chlorogenic Acid from Tobacco Waste

2021 ◽  
Vol 13 (8) ◽  
pp. 4481
Author(s):  
Marija Banožić ◽  
Antun Jozinović ◽  
Jovana Grgić ◽  
Borislav Miličević ◽  
Stela Jokić
Keyword(s):  
Chlorogenic Acid ◽  
Process Parameters ◽  
Electric Discharge ◽  
High Voltage ◽  
Treatment Time ◽  
Strong Dependence ◽  
Extraction Procedure ◽  
Polynomial Equation ◽  
Experimental Conditions ◽  
Tobacco Waste

Three fractions of tobacco waste (scrap, dust and midrib) were subjected to a high voltage electric discharge (HVED) assisted extraction procedure under different experimental conditions: solvent:solid ratio (300, 500, 700 mL/g), frequency (40, 70, 100 Hz) and treatment time (15, 30, 45 min), in order to study the influence of these conditions on the content of chlorogenic acid. The content of chlorogenic acid ranged from 1.54 to 3.66 mg/100 g for scrap, from 1.90 to 2.97 mg/100 g for dust, and from 2.30 to 3.38 mg/100 g for midrib extract, showing a strong dependence on the applied process parameters. The temperature change and the change in pH and electrical conductivity of the extracts after high voltage discharge treatment were also observed. The studied process parameters showed a statistically significant effect on the chemical and physical properties of the extracts from tobacco waste as well as on the content of chlorogenic acid, indicating the potential of HVED assisted processes in the separation of chlorogenic acid from tobacco industry waste. Multiple regression analysis was used to fit the results for the chlorogenic acid to a second order polynomial equation and the optimum conditions were determined.

Multiple Rock Breakdown in Electrodischarge Technology

2016 ◽  
Vol 712 ◽  
pp. 55-59
Author(s):  
Vladislav M. Vazhov ◽  
Sergey Y. Datskevitch ◽  
Mikhail Y. Zhurkov ◽  
Vasily M. Muratov ◽  
Arild Rødland
Keyword(s):  
Electric Discharge ◽  
High Voltage ◽  
Voltage Pulse ◽  
Rock Fracture ◽  
High Voltage Pulse ◽  
Electric Strength ◽  
Drilling Process ◽  
Drill Bit ◽  
Research Outcomes ◽  
Experimental Technology

The article covers the research of the electric strength and fracture of rocks that are undergone multiple breakdowns generated by electric discharge rock fracture and drilling technologies. The research outcomes allow proposing an experimental technology able to determine operating high voltage pulse values in the electric discharge drilling process where one should take into account such factors as the rock re-crushing and the drill bit shift cyclicity.

Assessment of the attained level and prospects for development of high-voltage pulse capacitors for downhole electric discharge facilities

2007 ◽  
Vol 78 (8) ◽  
pp. 435-438 ◽  
Author(s):  
I. Yu. Grebennikov ◽  
V. I. Gun’ko ◽  
A. Ya. Dmitrishin ◽  
L. I. Onishchenko ◽  
I. S. Shvets
Keyword(s):  
Electric Discharge ◽  
High Voltage ◽  
Voltage Pulse ◽  
High Voltage Pulse

scholarly journals Microstructure Investigation of 13Cr-2Mo ODS Steel Components Obtained by High Voltage Electric Discharge Compaction Technique

Materials ◽  
2015 ◽  
Vol 8 (11) ◽  
pp. 7342-7353 ◽  
Author(s):  
Igor Bogachev ◽  
Artem Yudin ◽  
Evgeniy Grigoryev ◽  
Ivan Chernov ◽  
Maxim Staltsov ◽  
...  
Keyword(s):  
Electric Discharge ◽  
High Voltage ◽  
Ods Steel

The Effect of Supplied Electrical Energy on Fuel Spray Using High-Voltage Electric Discharge

2003 ◽  
Vol 2003.39 (0) ◽  
pp. 197-198
Author(s):  
Tomonori TOMIZAWA ◽  
Koji YOSHIDA ◽  
Hideo SHOJI ◽  
Hidenori TANAKA
Keyword(s):  
Electric Discharge ◽  
High Voltage ◽  
Electrical Energy ◽  
Fuel Spray

scholarly journals Impulse Breakdown Characteristics of Main Gap in the Presence of a Local Discharge

2019 ◽  
Vol 6 (2) ◽  
pp. 413-423
Author(s):  
Abderrahmane Settaouti
Keyword(s):  
Breakdown Voltage ◽  
Electric Discharge ◽  
High Voltage ◽  
Discharge Channel ◽  
Dielectric Breakdown ◽  
Metallic Electrode ◽  
Factors Affecting ◽  
Electrode Location ◽  
The Third ◽  
Breakdown Mechanism

The characteristics of impulse breakdown voltages and the influence of the position of third electrode in air gap are investigated experimentally to study the parameters influencing the breakdown voltage in the presence of metallic objects around the high voltage power apparatus with air insulation. Experimental results show that the factors affecting the breakdown voltage are the shape and the size of the grounded electrode, the third metallic electrode location and the gap length. A comparison between negative and positive polarities of the applied voltages indicates an important influence of the polarity in the dielectric breakdown mechanism. The possible mechanism by which the local electric discharge initiates the main dielectric breakdown seems to be the high electric field around the local discharge channel and the streamers protruding from its surface.

scholarly journals Accurate Estimation of Frequency-Dependent Losses in High Voltage Test Transformers for the Assessment of Electric Discharge Powers

2019 ◽  
Vol 63 (3) ◽  
pp. 191-201
Author(s):  
Kada Laroussi ◽  
Samir Flazi
Keyword(s):  
Electric Discharge ◽  
High Voltage ◽  
Electrical Discharge ◽  
Voltage Source ◽  
Total Power ◽  
Accurate Estimation ◽  
Iron Core ◽  
Voltage Measurement ◽  
Voltage Transformer ◽  
Décharge Électrique

The work presented in this paper is related to the project GEMUDE (Genérateur Multifonction de Décharge Electrique) which aims to design a universal high-voltage generator for electrical discharge studies. To design this variable high voltage source that operates in the frequency range of 0 to 1 kHz, the assessment of transformer losses represents a crucial phase during the design process. These losses in the coils and iron core of the transformer are closely related to the frequency and nature of the materials used. This paper presents a comparative study of transformer losses using analytical methods and experimental calorimetry measurements. Steinmetz empirical formula is used to estimate magnetic core losses whereas coil losses are evaluated by solving Maxwell equations. The main goal is to control these losses to limit the internal temperature rise in the transformer through the implementation of an efficient cooling solution. The results obtained by the analytical method were satisfactory which confirm the feasibility of measuring the power absorbed by the various electrical discharge devices upstream of the high-voltage transformer. This is because it turns out that the power of the generator in charge is the total power of the electric discharge and the transformer losses. This method, termed Power Disparity Method (PDM). In this paper, it is an easy and reliable way as compared with high voltage measurement methods.

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