Physical Modeling of the Electrophysical Processes of the Formation of the Corona During the Operation of Electric Power Facilities

2021 ◽  
pp. 119-126
Author(s):  
Marina M. Rezinkina ◽  
Yevgen I. Sokol ◽  
Artur O. Zaporozhets ◽  
Oleg G. Gryb ◽  
Ihor T. Karpaliuk ◽  
...  
Keyword(s):  
Electric Power ◽  
Physical Modeling

On Physical Modeling of the Current Measurements in a Jet of Fire Extinguishing Agent

2021 ◽  
pp. 21-27
Author(s):  
E.A. Meshalkin ◽  
◽  
V.N. Bordakov ◽  
A.V. Kazakov ◽  
◽  
...  
Keyword(s):  
Electric Power ◽  
Leakage Current ◽  
Power Supply ◽  
Physical Modeling ◽  
Test Bench ◽  
Electric Power Supply ◽  
Fire Extinguishing ◽  
Agent Flow ◽  
Industrial Frequency ◽  
Fire Extinguishers

In accordance with the current regulations for extinguishing a fire, including without disconnecting electric power supply of direct (alternating) current of industrial frequency, fire extinguishers are allowed with a leakage current in a jet of extinguishing agent of not more than 500 µA, which is measured with an applied potential difference of 36 kV. Therefore, the recommendations for preliminary disconnection of electric power supply do not cover fire extinguishers that are certified according to the level of safe leakage current. The article deals with fire extinguishing agents based on aqueous solutions. It is obvious that the development of such fire extinguishers requires additional analytical and experimental research. The purpose of this article is the computational and physical modeling of the current leakage process, and the justification of the requirements for the parameters of the extinguishing agent flow at the outlet of the exhaust nozzle. As a result of the conducted research, the calculation methodоlogy and a scheme of the physical model of a high-voltage test bench for measuring the leakage current were developed based on measuring the active resistance of fire extinguishing agent flow in a constant voltage field and the electric capacitance of the measuring space of the test bench. The developed methodology allows to increase the reliability of the calculated results and significantly reduce the cost of working out the nozzle design. Measured at an applied voltage of 36 kV of industrial frequency, the amount of current leakage in a jet of the extinguishing agent is satisfactorily consistent with the calculation. The obtained computational and experimental results allowed to determine the range of permissible values of the active resistance and the requirements to the length of the continuous section of the jet of the extinguishing agent, which ensure safe use of the fire extinguisher for fire-fighting, including without disconnecting the electric power supply of the constant (alternating) current of industrial frequency with a voltage up to 1000 V.

Harvesting Ice by Electric Power

1912 ◽  
Vol 107 (15) ◽  
pp. 299-300
Author(s):  
Putnam A. Bates
Keyword(s):  
Electric Power

Boffalora-Ticino Hydro-Electric Power Plant

1906 ◽  
Vol 62 (1608supp) ◽  
pp. 25758-25758
Author(s):  
Alfred Gradenwitz
Keyword(s):  
Power Plant ◽  
Electric Power ◽  
Electric Power Plant

Electric Power on the Comstock

1902 ◽  
Vol 54 (1403supp) ◽  
pp. 22482-22482
Keyword(s):  
Electric Power

New Sources of Electric Power

1894 ◽  
Vol 38 (991supp) ◽  
pp. 15840-15842
Keyword(s):  
Electric Power

Dsp-based algorithm for electric power measurement

1993 ◽  
Vol 140 (6) ◽  
pp. 485 ◽  
Author(s):  
J.-C. Montaño ◽  
A. López ◽  
M. Castilla ◽  
J. Gutierrez
Keyword(s):  
Electric Power ◽  
Power Measurement

Direct ammonia fueled solid oxide fuel cells: A comprehensive review on challenges, opportunities and future outlooks

2020 ◽  
pp. 70-91 ◽  
Author(s):  
Molla Asmare ◽  
Mustafa Ilbas
Keyword(s):  
Electric Power ◽  
Energy Demand ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
Performance Comparison ◽  
Optimum Operating ◽  
Practical Implementation ◽  
Human Society ◽  
Energy Access ◽  
Green Fuel

Nowadays, the most decisive challenges we are fronting are perfectly clean energy making for equitable and sustainable modern energy access, and battling the emerging alteration of the climate. This is because, carbon-rich fuels are the fundamental supply of utilized energy for strengthening human society, and it will be sustained in the near future. In connection with this, electrochemical technologies are an emerging and domineering tool for efficiently transforming the existing scarce fossil fuels and renewable energy sources into electric power with a trivial environmental impact. Compared with conventional power generation technologies, SOFC that operate at high temperature is emerging as a frontrunner to convert the fuels chemical energy into electric power and permits the deployment of varieties of fuels with negligible ecological destructions. According to this critical review, direct ammonia is obtained as a primary possible choice and price-effective green fuel for T-SOFCs. This is because T-SOFCs have higher volumetric power density, mechanically stable, and high thermal shocking resistance. Also, there is no sealing issue problem which is the chronic issues of the planar one. As a result, the toxicity of ammonia to use as a fuel is minimized if there may be a leakage during operation. It is portable and manageable that can be work everywhere when there is energy demand. Besides, manufacturing, onboard hydrogen deposition, and transportation infrastructure connected snags of hydrogen will be solved using ammonia. Ammonia is a low-priced carbon-neutral source of energy and has more stored volumetric energy compared with hydrogen. Yet, to utilize direct NH3 as a means of hydrogen carrier and an alternative green fuel in T-SOFCs practically determining the optimum operating temperatures, reactant flow rates, electrode porosities, pressure, the position of the anode, thickness and diameters of the tube are still requiring further improvement. Therefore, mathematical modeling ought to be developed to determine these parameters before planning for experimental work. Also, a performance comparison of AS, ES, and CS- T-SOFC powered with direct NH3 will be investigated and best-performed support will be carefully chosen for practical implementation and an experimental study will be conducted for verification based on optimum parameter values obtained from numerical modeling.

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