Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Flashover"”.
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Prototype Design for Thermoacoustic Flashover Detector
The thermoacoustic flashover detector integrates the phenomenon of thermoacoustics into a fire fighting application. This report presents the prototype design for the thermoacoustic flashover detector to ultimately be implemented in a firefighter's gear. Upon increases in compartment fire heat flux …
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Mechanisms of flashover of contaminated insulators.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1974. Sc.D.
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Empirical and experimental studies of flashover in compartment fire
… hazard, prevention and control of flashover; characteristics of modem buildings and flashover in them; and distinction between backdraught and flashover were all summarized. The basic theories of flashover, major variables, research methods, means of identifying and predicting …
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Physical processes in the flashover of insulators with contaminated surfaces.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1971. Ph.D.
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Experimental and computational study of flames venting externally during full scale flashover fires
… been examined during two series of full scale flashover fires. The purpose of the work is to investigate the likelihood of external fire spread from a burn room window with standard glass, when the external facade is non-combustible. The effects on externally venting flames of internal …
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Flashover performance of lightning protected buildings using scaled models and electric field analysis
… thesis discusses the works that investigated the flashover performances occurred on the buildings with various structural geometry shapes. The case study method is using small scaled models for both laboratory and simulation works, aiming to understand the Franklin Rods performance on capturing …
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Effect of lining thermal inertia on small-scale compartment fire
… hot layer measuring position for post and pre flashover fires, and the models were compared with experiment. The current range of thermal inertia values for building products is much wider than those used in the regression by which the classical theory of pre-flashover temperature was derived …
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Computational investigation of flahover mechanisms using fire dynamics simulator (fds)
A pilot study of the development of flashover in enclosure fires was performed using the Fire Dynamics Simulator (FDS) platform. Practical criteria for flashover commonly proposed in the literature were investigated in the context of FDS modeling to determine similarity between the CFD model, …
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Modelling of Ignition and Fire in Vented Enclosures
… in an explosive and disastrous manner called flashover. This thesis examines when, why and how flashover occurs and gives the answers in terms of a few determining dimensionless parameters. The mechanism of flashover considered in this thesis is an enhancement of the burning rate because of …
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Simulation of haddad surge arrester model on a 132kV overhead transmission line for back flashover analysis using Alternative Transient Program (ATP)
… direct-strike to the wire shield generates back flashover as a result of voltage on insulator string magnitude is equal or exceeds the critical flashover voltage (CFO). Therefore, the insulation of surge arrester on transmission line is the way to reducing and finally solving the back flashover …
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Övertändning, backdraft och brandgasexplosion sett ur räddningstjänstens perspektiv
… presents a detailed description of the phenomena flashover, backdraft and smoke gas explosion. The physical and chemical processes which are involved in these phenomena are thoroughly discussed. The report also describes a number of compartment fire scenarios which are believed to be the most …
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Fire modelling of passenger trains
… in terms of heat release rate development, flashover potential, and available safe egress time at both 1.5 m and 0.9 m above the floor level, representing typical standing and crawling breathing zones. The results demonstrate that conventional luggage fires provide up to 5 min of evacuation …
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Mechanisms for triggering high-voltage breakdown in vacuum
… were also recorded of pulsed-field surface-flashover events on the alumina ceramic. An intensified high-speed video technique provided 1ms frames of surface-flashover events, whilst 100ns frames were achieved using an ultra high-speed fast-framing camera. By coupling this fast-frame camera …
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Nonlinear Polymer Nanocomposite for Field Grading in Medium-Voltage Power Converters under High-Altitude and Humid Environments
… medium-voltage (MV) power modules and suppress flashover on printed-circuit boards (PCBs) at high altitudes. Electric field simulations of the triple-point (TP) region revealed strong E-field intensification at conductor-ceramic-silicone and conductor-FR4-air interfaces, leading to premature …
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Lightntng protectton of quadruple circuit 275/132kV transmission line
… considering cases of shielding failure and backflashover. A sensitivity analysis was carried out to determine the relationship between the flashover rate and the parameters influencing it. To improve the lightning performance of the line, transmission line surge arresters were introduced using …
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Fast transient simulation of pinceti surge arrester model on a transmission line using ATP Software
… problem at the transmission line can cause flashover voltage at the insulator string, power system disturbances and transformer failure. To prevent of insulator string and equipment of the power system from damaging effect by lightning overvoltage, metal oxide surge arrester is installed at …
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Enhanced earthing performance by improved design and grounding material properties
… Fabricated E.G.E was tested under lightning flashover conditions in a HV laboratory using an impulse test generator in order to validate its electrical performance and prolog life expectancy. Data obtained from laboratory tests indicated that bauxite is the best material for the proposed …
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EM field effects on the surface of polluted HV insulators
… of failure. Knowledge of conditions leading to flashover is essential to design insulation levels. Discharges on the surface of polymeric insulators are one of the ageing mechanisms responsible for eventual failure. In this thesis, we examine water droplets on insulator surfaces. Chapter 1 …
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Hazards presented by pyrolysis and combustion products during laboratory experiments and real incidents
… showed how a modern incident able to develop to flashover would produce a dramatic change in conditions, capable of overcoming fire fighters as well as civilians. Rosepark Care Home demonstrated the importance of simple fire safety measures such as the closing of doors in keeping products of …
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