Simulation of power-system fault currents and voltages for protective-equipment testing

1976 ◽  
Vol 123 (1) ◽  
pp. 92
Author(s):  
L. Perez-Cavero ◽  
A. Wright
Keyword(s):  
Power System ◽  
Protective Equipment ◽  
Fault Currents ◽  
Equipment Testing

Simulation of power-system fault currents and voltages for protective-equipment testing

1975 ◽  
Vol 122 (6) ◽  
pp. 654
Author(s):  
B.L. Mathur ◽  
K. Parthasarathy ◽  
H.P. Khincha ◽  
A. Wright ◽  
L. Perez-Cavero
Keyword(s):  
Power System ◽  
Protective Equipment ◽  
Fault Currents ◽  
Equipment Testing

Emerging Medical Technologies for Fighting COVID-19: Prevention, Testing, and Treatment (Preprint)

2021 ◽  
Author(s):  
Zhuo Zhao ◽  
Rui Li ◽  
Yangmyung Ma ◽  
Iman Islam ◽  
Abdul M. Azam Rajper ◽  
...  
Keyword(s):  
Personal Protective Equipment ◽  
Social Impact ◽  
New Technologies ◽  
Protective Equipment ◽  
Rapid Rise ◽  
Testing Methods ◽  
Medical Treatments ◽  
The Public ◽  
Medical Technologies ◽  
Equipment Testing

UNSTRUCTURED During COVID-19, the clinical and healthcare demands have been on the rapid rise. Major challenges to addressing the pandemic include a lack of testing kits and shortages of ventilators to treat severe cases of COVID-19, insufficient accessibility to personal protective equipment for both hospitals and the public. New technologies have been developed by scientists, researchers, and companies in response to these demands. In this paper, 90 news articles and scientific reports on COVID-19-related innovations during 2020-2021 were screened and shortlisted to form a pool of candidates yielding a total of 20 publications for review which were then categorized into three sections: personal protective equipment, testing methods, and medical treatments. Each study was analyzed for its engineering characteristics and potential social impact on the COVID-19 pandemic. Finally, the guidelines for future disease prevention, diagnosis and treatment were summarized and discussed.

scholarly journals Transmission line short circuit analysis by impedance matrix method

2020 ◽  
Vol 10 (2) ◽  
pp. 1712
Author(s):  
Boniface Onyemaechi Anyaka ◽  
Innocent Onyebuchi Ozioko
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Matrix Method ◽  
Electrical Power ◽  
Fault Analysis ◽  
Single Line ◽  
Impedance Matrix ◽  
Electrical Power System ◽  
Ground Fault ◽  
Fault Currents

Fault analysis is the process of determining the magnitude of fault voltage and current during the occurrence of different types of fault in electrical power system. Transmission line fault analysis is usually done for both symmetrical and unsymmetrical faults. Symmetrical faults are called three-phase balance fault while unsymmetrical faults include: single line-to-ground, line-to-line, and double line-to-ground faults. In this research, bus impedance matrix method for fault analysis is presented. Bus impedance matrix approach has several advantages over Thevenin’s equivalent method and other conventional approaches. This is because the off-diagonal elements represent the transfer impedance of the power system network and helps in calculating the branch fault currents during a fault. Analytical and simulation approaches on a single line-to-ground fault on 3-bus power system network under bolted fault condition were used for the study. Both methods were compared and result showed negligible deviation of 0.02% on the average. The fault currents under bolted condition for the single line-to-ground fault were found to be 4. 7244p.u while the bus voltage is 0. 4095p.u for buses 1 and 2 respectively and 0. 00p.u for bus 3 since the fault occurred at this bus. Therefore, there is no need of burdensomely connecting the entire three sequence network during fault analysis in electrical power system.

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