Study of Arcing Faults in 35 kV Isolated Neutral and Resonant Grounded Systems Using Mathematical Model of Arc Gap

2020 ◽  
Author(s):  
Georgy Evdokunin ◽  
Yuri Seleznev ◽  
Anna Petrova
Keyword(s):  
Mathematical Model ◽  
Arcing Faults ◽  
Isolated Neutral

Simulation of Internal Arcing in High Voltage Switchgear Based on Fluent

2011 ◽  
Vol 383-390 ◽  
pp. 4346-4351
Author(s):  
Shun Yuan ◽  
Wei Wang ◽  
Feng Li
Keyword(s):  
Mathematical Model ◽  
High Voltage ◽  
Circuit Breaker ◽  
Three Dimensional ◽  
Development Cost ◽  
Calculation Methods ◽  
Pressure Relief ◽  
Fatal Injury ◽  
Arcing Faults ◽  
Fluent Software

Internal arcing faults in the high voltage switchgear may cause serious damage to the equipment and fatal injury to personnel. To simulation the fault arcs based on appropriate calculation methods can not only shorten the development period of arc resistant switchgear, but also save the development cost. In this paper, based on KYN28-12(Z) switchgear, three-dimensional mathematical model of pressure relief channel of circuit breaker chamber in switchgear is established by using the GAMBIT software, then simulate the process of internal arcing in switchgear by adopting FLUENT software. The influence of the length and depth of pressure relief vent, also the loading position of arc discussed in the simulation.

Mathematical model of hit phenomena and its application to movie advertisement

2008 ◽  
Author(s):  
Ishii Akira ◽  
Yoshida Narihiko ◽  
Hayashi Takafumi ◽  
Umemura Sanae ◽  
Nakagawa Takeshi
Keyword(s):  
Mathematical Model

Imprecision of Laboratory Determinations and Diagnostic Accuracy: Theoretical Considerations

1974 ◽  
Vol 13 (03) ◽  
pp. 151-158 ◽  
Author(s):  
D. A. B. Lindbebo ◽  
Fr. R. Watson
Keyword(s):  
Mathematical Model ◽  
Diagnostic Accuracy ◽  
Diagnostic Process ◽  
Clinical Laboratories ◽  
Non Linear ◽  
Theoretical Considerations ◽  
Made In

Recent studies suggest the determinations of clinical laboratories must be made more precise than at present. This paper presents a means of examining benefits of improvement in precision. To do this we use a mathematical model of the effect upon the diagnostic process of imprecision in measurements and the influence upon these two of Importance of Diagnosis and Prevalence of Disease. The interaction of these effects is grossly non-linear. There is therefore no proper intuitive answer to questions involving these matters. The effects can always, however, be calculated.Including a great many assumptions the modeling suggests that improvements in precision of any determination ought probably to be made in hospital rather than screening laboratories, unless Importance of Diagnosis is extremely high.

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