Application of surge diverters to the protection of gas-insulated substations / Tedjeddine Missoum (1984) 

Public ISBD Titre : Application of surge diverters to the protection of gas-insulated substations Type de document : texte imprimé Auteurs : Tedjeddine Missoum, Auteur ; J. P. Bickford, Directeur de thèse ; T. A. Shami, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1984 Importance : 120 f. Présentation : ill. Format : 30 cm. Note générale : Mémoire de Master : Electrical engineering : University of Manchester: 1984 Annexes f. 121-160. - Bibliogr. f. 161-165 Langues : Anglais (eng) Mots-clés : Gas insulated subtations Switching overvoltages Temporary overvoltages Lightning overvoltages BLD program Index. décimale : Ms00984 Résumé : Gas insulated substations (GIS) are exposed to the same types of overvoltages as conventional substations i.e., lightning overvoltages, switching overvoltages and temporary overvoltages. Possible means to limit overvoltages in GIS are active gap surge diverters and metal oxide surge diverters. The objective of this project is to study the effects of the system configuration on the performance of these two types of overvoltage limiting devices. This dissertation could be considered as consisting of four main parts. Chapters two and three give a description of gas insulated systems and of surge diverters respectively. Chapter four underlines the principales of insulation coordination involved, and does perhaps suggest how the problem should be approached. Chapter five gives a fairly comprehensive review of the principal methods of calculation and describes the computer program used. Finally, the results are presented and discussed in chapter six, and some general conclusions are suggested in chapter seven. Various articles and publications are referred to throughout the dissertation, giving an insight into the history of the subject, as well as providing further useful sources of information to the reader. Application of surge diverters to the protection of gas-insulated substations [texte imprimé] / Tedjeddine Missoum, Auteur ; J. P. Bickford, Directeur de thèse ; T. A. Shami, Directeur de thèse . - Manchester : [s.n.], 1984 . - 120 f. : ill. ; 30 cm. Mémoire de Master : Electrical engineering : University of Manchester: 1984 Annexes f. 121-160. - Bibliogr. f. 161-165 Langues : Anglais (eng) Mots-clés : Gas insulated subtations Switching overvoltages Temporary overvoltages Lightning overvoltages BLD program Index. décimale : Ms00984 Résumé : Gas insulated substations (GIS) are exposed to the same types of overvoltages as conventional substations i.e., lightning overvoltages, switching overvoltages and temporary overvoltages. Possible means to limit overvoltages in GIS are active gap surge diverters and metal oxide surge diverters. The objective of this project is to study the effects of the system configuration on the performance of these two types of overvoltage limiting devices. This dissertation could be considered as consisting of four main parts. Chapters two and three give a description of gas insulated systems and of surge diverters respectively. Chapter four underlines the principales of insulation coordination involved, and does perhaps suggest how the problem should be approached. Chapter five gives a fairly comprehensive review of the principal methods of calculation and describes the computer program used. Finally, the results are presented and discussed in chapter six, and some general conclusions are suggested in chapter seven. Various articles and publications are referred to throughout the dissertation, giving an insight into the history of the subject, as well as providing further useful sources of information to the reader.

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Documents numériques

MISSOUM.Tadjeddine.pdf URL

Charge injection into insulators / B. Bouattou (1987) 

Public ISBD Titre : Charge injection into insulators Type de document : texte imprimé Auteurs : B. Bouattou, Auteur ; John Lowell, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1987 Importance : 94 f. Présentation : ill. Format : 30 cm. Note générale : Mémoire de Master : Electrical engineering : Victoria University of Manchester : 1987 Mémoire de Master en Electrotechnique Annexes [15] f.. - Bibliogr. [3] f. Langues : Anglais (eng) Mots-clés : Polymers Charge transfer Conduction mechanism Polarisation Index. décimale : Ms00487 Résumé : This thesis describes a new techniques to obtain information about the mechanisms of conduction in polymers by measuring the charge transfer in repeated contacts with liquid mercury. Conventinal conductivity measurements employing electrodes and methods based on the surface potential cannot reliably distinguish between the motion of free carriers and polarisation currents associated with dipole orientation. Our technique in contrast can provide a good indication of conduction mechanism and can distinguish true charge from polarisation charge. The experiments show that charge is immobile on PTFE and SAPHIRE; free intrinsic carriers are responsible for the conduction in NYLON. Novel behaviour is found for PS, PMMA, PVC; charge remains close to the surface for short time between contacts. However, for longer time, experiment shows that the charge is mobile but the mechanism of motion is unclear. Charge injection into insulators [texte imprimé] / B. Bouattou, Auteur ; John Lowell, Directeur de thèse . - Manchester : [s.n.], 1987 . - 94 f. : ill. ; 30 cm. Mémoire de Master : Electrical engineering : Victoria University of Manchester : 1987 Mémoire de Master en Electrotechnique Annexes [15] f.. - Bibliogr. [3] f. Langues : Anglais (eng) Mots-clés : Polymers Charge transfer Conduction mechanism Polarisation Index. décimale : Ms00487 Résumé : This thesis describes a new techniques to obtain information about the mechanisms of conduction in polymers by measuring the charge transfer in repeated contacts with liquid mercury. Conventinal conductivity measurements employing electrodes and methods based on the surface potential cannot reliably distinguish between the motion of free carriers and polarisation currents associated with dipole orientation. Our technique in contrast can provide a good indication of conduction mechanism and can distinguish true charge from polarisation charge. The experiments show that charge is immobile on PTFE and SAPHIRE; free intrinsic carriers are responsible for the conduction in NYLON. Novel behaviour is found for PS, PMMA, PVC; charge remains close to the surface for short time between contacts. However, for longer time, experiment shows that the charge is mobile but the mechanism of motion is unclear.

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Documents numériques

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A computer study of surface diffusion on the HUB and shroud of a centrifugal compressor / Mahfoud Kadja (1983)

Public ISBD Titre : A computer study of surface diffusion on the HUB and shroud of a centrifugal compressor Type de document : texte imprimé Auteurs : Mahfoud Kadja, Auteur ; C. Bosman, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1983 Importance : 52 f. Présentation : ill. Format : 30 cm. Note générale : Master of Science : Mechanical engineering : University of Manchester : 1983 Bibliogr. f. 53 - 57. Annexe [60] f Langues : Anglais (eng) Mots-clés : Computer study Surface diffusion Centrifugal compressor Flow in turbomachines Index. décimale : Ms01083 Résumé : A computer program developed by previous M.Sc students (1,2) has been applied to solve the equations governing the steady, inviscid and adiabatic flow on a hub to shroud (S2) streamsurface of the Eckardt centrifugal compressor. The effects on the relative velocity distributions on the hub and shroud (and thus on the losses in the compressor) of varying the hub, shroud and blade shapes - for the same load on the Compressor - were investigated. In trying to lessen surface diffusion in the Compressor, it was found that neither the shroud nor the blade shapes have a significant effect on diminishing flow deceleration along the hub and shroud and that only the hub shape need be varied to significantly reduce the diffusion. A hub shape which leads to a much reduced diffusion than in the original Eckardt Compressor was therefore found by "trial and error". Finally, a second computer program developed by another M.Sc. student (4), was used to assess the merits of the different designs obtained by varying the hub or shroud or blade shapes over the original design of the Eckardt centrifugal compressor. This was done by comparing the turbulent boundary layer characteristics (i.e. form factor, displacement thickness, momentum thickness and energy thickness) on the hub and shroud of the compressors. It was found that the design having a "trial and error hub" can be expected to experience more energy losses but to have a much higher operating flexibility than the original design of the Eckardt compressor. A computer study of surface diffusion on the HUB and shroud of a centrifugal compressor [texte imprimé] / Mahfoud Kadja, Auteur ; C. Bosman, Directeur de thèse . - Manchester : [s.n.], 1983 . - 52 f. : ill. ; 30 cm. Master of Science : Mechanical engineering : University of Manchester : 1983 Bibliogr. f. 53 - 57. Annexe [60] f Langues : Anglais (eng) Mots-clés : Computer study Surface diffusion Centrifugal compressor Flow in turbomachines Index. décimale : Ms01083 Résumé : A computer program developed by previous M.Sc students (1,2) has been applied to solve the equations governing the steady, inviscid and adiabatic flow on a hub to shroud (S2) streamsurface of the Eckardt centrifugal compressor. The effects on the relative velocity distributions on the hub and shroud (and thus on the losses in the compressor) of varying the hub, shroud and blade shapes - for the same load on the Compressor - were investigated. In trying to lessen surface diffusion in the Compressor, it was found that neither the shroud nor the blade shapes have a significant effect on diminishing flow deceleration along the hub and shroud and that only the hub shape need be varied to significantly reduce the diffusion. A hub shape which leads to a much reduced diffusion than in the original Eckardt Compressor was therefore found by "trial and error". Finally, a second computer program developed by another M.Sc. student (4), was used to assess the merits of the different designs obtained by varying the hub or shroud or blade shapes over the original design of the Eckardt centrifugal compressor. This was done by comparing the turbulent boundary layer characteristics (i.e. form factor, displacement thickness, momentum thickness and energy thickness) on the hub and shroud of the compressors. It was found that the design having a "trial and error hub" can be expected to experience more energy losses but to have a much higher operating flexibility than the original design of the Eckardt compressor.

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Design and analysis of a transient generator / M.N. Hamlaoui (1985)

Public ISBD Titre : Design and analysis of a transient generator Type de document : texte imprimé Auteurs : M.N. Hamlaoui, Auteur ; I.D. Couper, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1985 Importance : 184 f. Présentation : ill. Format : 29 cm. Note générale : Master Thesis : Electrical engineering : University of Manchester : 1985 Bibliogr. f. 182 - 184 Langues : Anglais (eng) Mots-clés : Design Analysis Transient generator Index. décimale : Ms01385 Résumé : The thesis outlines work carried out to generate switching overvoltages by designing a transient generator and analysis by computer programs of the transient waves. Two studies have been done. The first one is practical, based on the design of a transient generator. The second work employs computer programs to simulate those transients produced by the former approach and to analyse the effects of many parameters on waveshapes in order to produce the most common waveshapes similar to those experienced in power systems. Design and analysis of a transient generator [texte imprimé] / M.N. Hamlaoui, Auteur ; I.D. Couper, Directeur de thèse . - Manchester : [s.n.], 1985 . - 184 f. : ill. ; 29 cm. Master Thesis : Electrical engineering : University of Manchester : 1985 Bibliogr. f. 182 - 184 Langues : Anglais (eng) Mots-clés : Design Analysis Transient generator Index. décimale : Ms01385 Résumé : The thesis outlines work carried out to generate switching overvoltages by designing a transient generator and analysis by computer programs of the transient waves. Two studies have been done. The first one is practical, based on the design of a transient generator. The second work employs computer programs to simulate those transients produced by the former approach and to analyse the effects of many parameters on waveshapes in order to produce the most common waveshapes similar to those experienced in power systems.

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Design and construction of a magnetoresistive microphone / Addad, Malik (1985)

Public ISBD Titre : Design and construction of a magnetoresistive microphone Type de document : texte imprimé Auteurs : Addad, Malik, Auteur ; E. Cohen, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1985 Importance : 56 f. Présentation : ill. Format : 30 cm. Note générale : Master of Science : Electronic engineering : University of Manchester : 1985 Annexe f. 57 - 61 . Bibliogr. f. 62 Langues : Anglais (eng) Mots-clés : Magnetoresistive microphone Acoustics Index. décimale : Ms00885 Résumé : The purpose of this dissertation is to design and construct a magnetoresistive microphone using the magnetoresistive effect. The aim of the first two chapters is to present a preliminary knowledge about magnetoresistivity, magnetism and acoustics so as to get necessary background to carry out this dissertation. Although the main purpose of the third chapter has been the design and the construction of the magnetoresistive microphone, the design of the magnet and polepieces covers two thirds of it. This is due to the fact that the better the design of the magnet and polepieces, the better the magnetoresistive microphone performances. Futhermore, for every magnet constructed the graph of the magnetoresistance R against displacement x has been plotted and then, the gradient calculated. The purpose of designing several magnets is to find out the magnet which has the appropriate gradient. The higher the gradient is, the more sensitive the magnetoresistive microphone will be. The final chapter has been devoted to the calibration of the microphone using an anechoic chamber. Design and construction of a magnetoresistive microphone [texte imprimé] / Addad, Malik, Auteur ; E. Cohen, Directeur de thèse . - Manchester : [s.n.], 1985 . - 56 f. : ill. ; 30 cm. Master of Science : Electronic engineering : University of Manchester : 1985 Annexe f. 57 - 61 . Bibliogr. f. 62 Langues : Anglais (eng) Mots-clés : Magnetoresistive microphone Acoustics Index. décimale : Ms00885 Résumé : The purpose of this dissertation is to design and construct a magnetoresistive microphone using the magnetoresistive effect. The aim of the first two chapters is to present a preliminary knowledge about magnetoresistivity, magnetism and acoustics so as to get necessary background to carry out this dissertation. Although the main purpose of the third chapter has been the design and the construction of the magnetoresistive microphone, the design of the magnet and polepieces covers two thirds of it. This is due to the fact that the better the design of the magnet and polepieces, the better the magnetoresistive microphone performances. Futhermore, for every magnet constructed the graph of the magnetoresistance R against displacement x has been plotted and then, the gradient calculated. The purpose of designing several magnets is to find out the magnet which has the appropriate gradient. The higher the gradient is, the more sensitive the magnetoresistive microphone will be. The final chapter has been devoted to the calibration of the microphone using an anechoic chamber.

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Energy losses in centrifugal fans / A. Khaldi (1983)

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Failure identification methods for detecting leaks in pipelines and sensor faults / Benkherouf, Abdelkrim (1985) 

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Industrial policy in France, 1973-85 / Abdennacer Moussi (1986) 

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Phase equilibria in very dilute mixtures of water and halogenated hydrocarbons / Brahim Khalfaoui (1992) 

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Sequencing of the packing activity in large detergent plant / K. Belarbi (1984)

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Some aspects of NMR spectroscopy / Laidoudi Bouakkar (1988) 

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Strain distribution through the thickness of glass reinforced laminates under bending loads / Mohamed Tahraoui (1985)

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Techniques of estimation and testing for the limited dependent variable models / Hamoudi Hadj Sahraoui (1984) 

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The computation of turbulent surface wakes / Bellil, Mohamed (1991) 

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The development of instrumentation to monitor the flux densities of vapour species during the deposition of zinc sulphoselenide film material / Mohammed Benyezzar (1986) 

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