scholarly journals Comparison of I-V Curves Between the Experiment of Corona Discharge on Gradient Line-To-Plane (GL-P) Configuration and The Mathematical Approach

2021 ◽  
Vol 3 (2) ◽  
pp. 155-164
Author(s):  
Susilo Hadi ◽  
Asep Yoyo Wardaya ◽  
Zaenul Muhlisin ◽  
Jatmiko Endro Suseno ◽  
Pandji Triadyaksa ◽  
...  
Keyword(s):  
Corona Discharge ◽  
Characteristic Curve ◽  
Mathematical Formulation ◽  
Electrical Current ◽  
Electrical Circuit ◽  
Multiplication Factor ◽  
Mathematical Study ◽  
Active Electrode ◽  
Electrode Shape ◽  
Gradient Line

Research has been conducted on the comparison of the I-V characteristic curve between mathematical study and experiment of the generation of negative DC corona discharge in the Gradient Line-to-Plane (GL-P) electrode configuration. The reason for this research is to calculate the suitability of the corona discharge electrical current between the mathematical and experimental study. The active electrode used has length 2 cm and height 4 cm. This research is conducted with variations in the sharpness angle of the active electrode (θ) 300, 450, and 600 and variations in the distance between the electrodes () 2 cm, 3 cm, and 4 cm. The mathematical formulation of the value of the corona discharge electrical current in the configuration of the GL-P electrode is obtained by using the geometric concept approach, which is the formulation of the capacitance value of the ordinary electrical circuit, with the addition of the multiplication factor value k in the sharp area of the active electrode, because in that area the greatest plasma flow distance is obtained. The value of the multiplication factor  is obtained by fitting the curve between mathematical study and experiments. The I-V curve between the mathematical study and the corona discharge generation experiment has a high degree of similarity with the smallest percentage contacting point of 37.50%.The value of the multiplication factor  is influenced by the sharpness angle of the active electrode shape and the distance between the electrodes.

ACTIVE ELECTRODE SHAPE EFFECT ON THE CORONA DISCHARGE IN AN ELECTROSTATIC PRECIPITATOR\

2017 ◽  
Vol 16 (11) ◽  
pp. 2545-2551
Author(s):  
Nouri Hamou ◽  
Aissou Massinissa ◽  
Aitsaid Hakim ◽  
Zebboudj Youcef
Keyword(s):  
Corona Discharge ◽  
Electrostatic Precipitator ◽  
Shape Effect ◽  
Active Electrode ◽  
Electrode Shape

scholarly journals Electrical Equivalent Circuit of Multi-Tips Pulsed Corona Discharge Reactor

2021 ◽  
Vol 348 ◽  
pp. 01014
Author(s):  
Karim Saber ◽  
Alyen Abahazem ◽  
Nofel Merbahi ◽  
Mohamed Yousfi
Keyword(s):  
Corona Discharge ◽  
Electrical Circuit ◽  
Electrical Model ◽  
Electrical Equivalent Circuit ◽  
Rls Algorithm ◽  
Estimated Parameters ◽  
Maximum Value ◽  
Pulsed Corona ◽  
Discharge Behavior

In this work, an electrical model equivalent to the corona discharge reactor has been proposed in a multitips plan configuration, in dry air at atmospheric pressure. The electrical parameters evolution of the circuit are obtained by using the identification method which is based on the least squares recursive (RLS) algorithm, the estimated parameters allow us to describe the corona discharge behavior inside the reactor. The RLS method used during the determination of capacitance and resistance is validated by the comparison between the measured and the calculated currents, the significant forms of capacitance and resistance confirm the validity of the proposed electrical model. The estimated parameters of the electrical circuit allowed us to determine the discharge power, the power delivered to the reactor and thus the energy efficiency during the discharge, this efficiency increases during the propagation of streamers towards the plane, it reaches a maximum value which is equal to 50% in the case of the fourtips- plane configuration. The energy stored in the reactor is also calculated using the electrical circuit, it increases to a maximum value of 2.6 pJ, which is a very low value compared to the energy delivered to the reactor. This work allows us to control the discharge and lost energy during the corona discharge in the case of multi-tips-plane configuration.

scholarly journals Pembuatan KIT Sederhana Rangkaian Listrik Dinamis Sebagai Produk Akhir Pada Mata Kuliah Praktikum IPA

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Dedi Riyan Rizaldi ◽  
Kasmah Harwati ◽  
Ziadatul Fatimah ◽  
Muh. Makhrus
Keyword(s):  
Secondary Level ◽  
Electrical Current ◽  
Electrical Circuit ◽  
Parallel Circuits ◽  
Three Stages ◽  
Learning Dynamic ◽  
And Storage

Learning physics is of course a part of science and should be able to facilitate students to do lab sessions or experiments to prove the concepts learned. One of them relates to dynamic electricity at the secondary level. However, there are still many schools that do not have practical tools that can assist students in learning dynamic electricity equipment. Therefore, the writing of this article is to explain the process of making a simple KIT dynamic electrical circuit as the final product in the science practicum course. The process to create this KIT consists of three stages, namely preparation, implementation and testing. Based on the work carried out, this appears 1). The process of making a dynamic electrical circuit KIT is divided into two parts, namely making tool sets and storage boxes, and 2). Practical activities that can use this electrical circuit KIT include measuring the size of GGL on the battery, measuring the voltage and electrical current, as well as series and parallel circuits

Formulation of “Stability Equations” and Derivation of New Constructions with Complete Systems of Design-formulae for Variable-speed Control Mechanisms

1953 ◽  
Vol 167 (1) ◽  
pp. 319-339
Author(s):  
M. S. Frenkel
Keyword(s):  
Nuclear Physics ◽  
Characteristic Curve ◽  
Mathematical Formulation ◽  
Control Mechanisms ◽  
Variable Speed ◽  
Speed Governor ◽  
Minimum Number ◽  
Order Of Magnitude ◽  
The Stability ◽  
Stable Characteristic

Requirements for stability are formulated mathematically and, through the “transformatory operations of mathematics”, yield a series of “stability equations” of ascending order which are generally applicable, for example to control mechanisms, electronics†, nuclear physics, etc. From these stability equations, the equation of the stable characteristic curve of a governor, and the differential equations of the oscillations of a governor-engine system, are derived. It emerges that the first part of the new oscillatory equation is identical with the whole of the differential equation in the literature to date (unchanged since Maxwell 1868)‡, while the important second part, which consists of terms of the same order of magnitude as the first part and which is the only one containing the equation of the stable characteristic curve, is lacking in literature. The stability equations classify all possible constructions of variable-speed governor according to “order of stability”, which signifies important operating properties. This classification accounts for the known shortcomings of conventional types. The stability equations, combined with the mathematical formulation of practical requirements (speed-adjustment with only one actuating motion, etc.), lead to new basic types of variable-speed governor, with complete systems of design equations. In addition to determining all unknown dimensions, this set of equations is important because it derives constructions of which the complexity increases with order of stability and, furthermore, a simple construction which provides any required high order of stability with the minimum number of adjustable components.

Experimental relationship of radiofrequency electrical current and lesion size for application to percutaneous cordotomy

1970 ◽  
Vol 33 (4) ◽  
pp. 415-421 ◽  
Author(s):  
John L. Fox
Keyword(s):  
Power Density ◽  
Neural Tissue ◽  
Electrical Current ◽  
Lesion Size ◽  
Electrode Placement ◽  
Active Electrode ◽  
Content Type ◽  
Percutaneous Cordotomy ◽  
Radiofrequency Current ◽  
Anesthetized Dogs

✓ Using the brains of anesthetized dogs, a study was carried out to evaluate the role played by differences in electrode size and inaccuracies in electrode placement during percutaneous cordotomy. It was determined that if the bare, active-electrode actually is entirely inside neural tissue, an effective lesion can be created with a minimum of current. For example, by using an electrode 3 mm in length and 0.4 mm in diameter, a radiofrequency current level of 50 mA (1.3 W) for 60 sec will create a lesion 5.5 mm long and 5 mm wide. If this electrode is properly positioned within neural tissue, it is impossible to achieve current levels of 75 mA or more, for the power density becomes so high that the local tissue is boiled and fried, which creates a gaseous and/or organic insulation around the electrode causing the current to drop to zero. The same phenomenon occurs at lower current levels if a smaller electrode is used due to the higher power density caused by putting the current through a smaller electrode-tissue interface. If all or any part of the bare, active electrode is outside neural tissue and in contact with cerebrospinal fluid, up to 100 to 300 mA of current may be needed to effect an adequate lesion since most of the current supplied is then shunted proportionately away from the high impedance neural tissue and into the lower impedance CSF. The heat spreading to the leptomeninges probably accounts for the severe neck pain experienced.

scholarly journals Forensic Engineering Analysis Of Electric Shock From Ground Fault Circuit Interrupter (GFCI)

2003 ◽  
Vol 20 (2) ◽  
Author(s):  
Richard D. Brugger
Keyword(s):  
Electric Shock ◽  
Electrical Current ◽  
Electrical Circuit ◽  
Engineering Analysis ◽  
Ground Fault ◽  
Ground Current ◽  
Forensic Engineering ◽  
Current Value ◽  
The Difference ◽  
Electrical Wiring

Many Electrical Wiring Systems Include Ground Fault Circuit Interrupters (Gfci) As Protective Elements. The Application Is For Avoidance Of Electric Shock Injuries To A Person In The Event That Their Body Becomes Part Of An Electrical Circuit Path From A Live Wire And Ground. The Theory Behind The Device Is That If There Is A Difference In Electrical Current Flowing Through The Live (120 Volt Ac) Wire And The Neutral Wire, Then The Difference Current Is Flowing To Ground And Is Potentially Hazardous To A Person. Functionally, The Gfci Should Automatically Open The Electrical Circuit Above A Certain Ground Current Value. This Paper Explores How The Circuit May Fail To Provide The Protection For Which It Is Intended, And Result In An Electric Shock.

scholarly journals Integrating Electrical Analogy and Computer Modeling of Groundwater Flow for Teaching Flownet Concepts

2013 ◽  
Vol 3 (4) ◽  
pp. 39
Author(s):  
Murthy Kasi ◽  
Yaping Chi ◽  
G. Padmanabhan
Keyword(s):  
Groundwater Flow ◽  
Steady Flow ◽  
Computer Model ◽  
Flow Problem ◽  
Lesson Plan ◽  
Mathematical Formulation ◽  
Electrical Current ◽  
Experimental Setup ◽  
Electrical Analogy ◽  
Electrical Current Flow

Laplace equation is the basic differential equation that governs the steady flow of a fluid through an isotropic and homogeneous porous medium and also the steady flow of current in a conducting medium. Therefore, a steady-state groundwater flow problem can be formulated as an analogous electrical current flow problem. A flow net, set of grids formed by orthogonally intersecting equipotential lines and flow lines, is a graphical solution to the equations of steady groundwater flow. By definition, flownet for the original groundwater problem and the corresponding analogous electrical problem should be similar. This feature allows the possibility of introducing the concepts of flownets to students using the easily demonstrable electrical counterpart of the problem in a laboratory setting. This paper discusses the efforts of the authors to widen the scope of an experiment already included in the Fluid Mechanics laboratory course of a Civil Engineering curriculum and to better teach flownet principles using the electrical analogy of groundwater flow problems. Students used a simple experimental setup to obtain flownets for selected groundwater flow situations with different boundary conditions using the electrical analogy concept. Students also used a groundwater flow computer model to obtain flownets for the same flow situations and compared the results. The laboratory lesson plan consisted of five steps: (i) study and understand the selected physical groundwater problems, (ii) conceptualize the corresponding analogous electrical problems (iii) use the electrical analogy experimental setup to obtain flownets, (iv) study and understand the mathematical formulation of the problems, and (v) compare the analogous results with those obtained from a groundwater flow computer model. Sample results obtained by students are presented. The student feedback indicated that this approach resulted in an effective learning of the concepts involved.

scholarly journals Improved Current Doubler Rectifier

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2485 ◽  
Author(s):  
Mihail Antchev
Keyword(s):  
Electrical Current ◽  
Electrical Circuit ◽  
Circuit Diagram

It is widely accepted to examine and explain the functioning of the standard “Current Doubler Rectifier” as strictly symmetrical according to the electrical current through the two inductances. The present work challenges this consideration and proposes a new version of the electrical circuit diagram where the current symmetry is improved. The proposed circuit is called the “Improved Current Doubler Rectifier”.

scholarly journals Effect of Temperature on the Working Parameters of Negative Corona Discharge with Coaxial Electrodes Configuration

2019 ◽  
pp. 1977-1984
Author(s):  
Mustafa K. Jassim ◽  
Enas A. Jawad ◽  
Jamal K. Alsaide
Keyword(s):  
Corona Discharge ◽  
Characteristic Curve ◽  
Effect Of Temperature ◽  
Comsol Multiphysics ◽  
The Finite Element Method ◽  
Negative Corona ◽  
Dry Air ◽  
Negative Corona Discharge ◽  
Working Parameters ◽  
Good Agreement

     The influence of ambient temperature on the various parameters of negative corona discharge in atmospheric dry air with coaxial cylindrical electrodes is investigated. The calculations are achieved using the finite element method by COMSOL Multiphysics software. The investigation aims to notice the effect many of working temperatures on the I-V characteristic curve of negative corona discharge in the air. The calculations of several parameters (electron density, temperature, ...) are presented visually and discussed. The results of the work are compared with theoretical and experimental data and they are in a good agreement.

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