Calculation of Influence on Discharge Current Peaks for Human Air Discharges of Spark Lengths and Breakdown Potential Gradients using Simplified Equivalent Circuit based on IEC Standard

2021 ◽  
Vol 141 (3) ◽  
pp. 202-203
Author(s):  
Yukihiro Tozawa ◽  
Takeshi Ishida ◽  
Osamu Fujiwara
Keyword(s):  
Equivalent Circuit ◽  
Discharge Current ◽  
Breakdown Potential ◽  
Potential Gradients

scholarly journals Improvement of an Equivalent Circuit Model for Li-Ion Batteries Operating at Variable Discharge Conditions

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 78
Author(s):  
Gabriele Maria Lozito ◽  
Valentina Lucaferri ◽  
Francesco Riganti Fulginei ◽  
Alessandro Salvini
Keyword(s):  
Energy Harvesting ◽  
Equivalent Circuit ◽  
Discharge Current ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Model Parameters ◽  
Estimation Algorithms ◽  
Harvesting Systems ◽  
Li Ion ◽  
Global And Local

A real time simulation of battery conditions is an essential step in the development of energy harvesting devices. Since it is not possible to have a direct measurement, the battery information, such as the remaining charge, need to be estimated by means of model-based estimation algorithms. Most of the existing models describing battery behaviour, are suitable only for a constant discharge current. This paper proposes a study of the dependence of the equivalent circuit model parameters on different discharge conditions. The model presented provides a powerful tool to represent the batteries’ behaviour in energy harvesting systems, involving continuous charge and discharge cycles. The extraction of parameters was performed, starting from a set of reference curves generated in Matlab Simulink environment, referring to Li-ion technology batteries. The parameters were extracted by means of a cascade of global and local search identification algorithms. Finally, the relations describing parameters’ behaviours as functions of the discharge current are presented.

scholarly journals Simulation of impulse current generator for testing surge arresters using frequency-dependent models

2021 ◽  
Vol 1 (1(57)) ◽  
pp. 25-29
Author(s):  
Yevgeniy Trotsenko ◽  
Volodymyr Brzhezitsky ◽  
Olexandr Protsenko ◽  
Yaroslav Haran
Keyword(s):  
Equivalent Circuit ◽  
Discharge Current ◽  
Circuit Simulation ◽  
Current Generator ◽  
Nonlinear Load ◽  
Residual Voltage ◽  
Frequency Dependent ◽  
Surge Arresters ◽  
Impulse Current Generator ◽  
Impulse Current

The object of research is the equivalent circuit of an impulse current generator designed for testing surge arresters. Calculation of the impulse current generator parameters when discharging a capacitor bank to a complex nonlinear load is a difficult task for an analytical solution. Until now, the application of surge arrester frequency-dependent models was limited to the problems of overvoltage computation. Surge arrester frequency-dependent models can predict the residual voltage with high accuracy. This is the reason to consider that surge arrester frequency-dependent models can be used for calculating the main parameters of impulse current generators designed for physical testing of surge arresters. The task of determining the equivalent circuit parameters required for getting a discharge current of a given waveform and amplitude in an impulse current generator scheme with a nonlinear load was solved using circuit simulation. This article presents the results of studying the processes in impulse current generator equivalent circuit. In the circuit a dynamic model of a surge arrester is used as the load model. For this, an equivalent circuit for the discharge path of the impulse current generator was drawn up. The parameters of the circuit elements (including the required number of capacitors and their charging voltage) are determined, which are necessary for getting a discharge current of a given standardized waveform and amplitude. The parameters of the discharge path are determined for surge arresters of three different voltage classes. It was found that the relative error when determining the residual voltage between the terminals of the surge arrester model does not exceed 3 %. The work contributes to the further development of circuit simulation of surge arresters and the expansion of the scope of surge arrester dynamic models. As a result of the research performed, the possibility of using surge arrester frequency-dependent models for determining the discharge current waveform in impulse current generators is shown. The research performed is relevant due to the fact that surge arresters have become a main tool for protecting the insulation of electrical network equipment against external and internal overvoltages

ATMOSPHERIC ELECTRICITY AND GEOPHYSICAL OPERATIONS

Geophysics ◽  
1955 ◽  
Vol 20 (3) ◽  
pp. 638-653
Author(s):  
Glenn W. Fordham
Keyword(s):  
Corona Discharge ◽  
Discharge Current ◽  
Atmospheric Electricity ◽  
High Potential ◽  
Safety Hazards ◽  
High Gradients ◽  
Stormy Weather ◽  
Potential Gradients

The safety hazards of lightning to seismic crews using explosives are well known. Lightning is a result of high potential gradients in the atmosphere. These high gradients, which accompany stormy weather, can be detected by measuring the corona‐discharge current from a sharp metal point called a point collector. Oscillograms of point‐collector currents taken during thunderstorms may be a definite aid to field personnel in determining when lightning is imminent. Many more data are needed. It is hoped that others in the industry will take similar measurements and pool the data thus obtained.

Equivalent circuit for a GaAs CCD

1993 ◽  
Vol 140 (6) ◽  
pp. 377
Author(s):  
S. Pennathur ◽  
H.H.L. Kwok
Keyword(s):  
Equivalent Circuit
Sign in / Sign up

Export Citation Format

Share Document