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Investigation of the impacts of the refill valve diameter on prestrike occurrence in gas circuit breakers
, Article Physics of Fluids ; Volume 33, Issue 8 , August , 2021 ; 10706631 (ISSN) ; Kazempour, A ; Gholami, A ; Sharif University of Technology
American Institute of Physics Inc
2021
Abstract
In puffer type Sulfur Hexafluoride (SF6) Circuit Breakers (CBs), the refill valve is the main inlet duct for the SF6 gas to enter the puffer volume. When the CB is closing and moving contacts and the nozzle are moving toward fixed contacts, the SF6 gas enters the puffer volume via the refill valve. Since changing the refill valve diameter can alter the direction of the SF6 gas motion in the closing operation of CBs, understanding its effects on CBs' function and performance may help to improve the CB design. This paper has focused on the effects of refill valve diameter on prestrike occurrence in the closing operation of puffer type SF6 CBs. In order to accurately study these effects, some...
The Effect of Process Variables on Boric Acid Production
, M.Sc. Thesis Sharif University of Technology ; Halali, Mohammad (Supervisor) ; Askari, Masoud (Supervisor)
Abstract
In the present project, in order to be self-sufficient and optimal use of boron mines in Iran, a study entitled “The effect of process variables on the production of boric acid” has been conducted, This project has two main objectives: the first objective is the production of boric acid from boron sources and mines in Iran and the second objective is to analyze the effect of variables such as temperature, time, acid concentration, solid to liquid ratio and particle size on the purity of boric acid produced. And finally achieve the optimal conditions for the production of boric acid.In this study, boric acid was made from leaching hydrobracite (magnesium-calcium ore with boron) with sulfuric...