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You searched for subject:(Corona discharges). Showing records 1 – 3 of 3 total matches.

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University of Manchester

1. Da Silva domingues, Elizabeth. Improved Condition Monitoring of Composite Insulators.

Degree: 2012, University of Manchester

Although the cost of investment in power lines insulators is 3 - 5% of the total cost of the installation, the impact of their performance on reliability, failure costs, maintenance routines, etc in power systems is tens of times higher. Composite insulators were introduced 50 years ago and have been used around the world with consistently good experience. Low weight, easy handling, good performance under high pollution, low maintenance costs, and resistance to vandalism are some of their advantages. Nevertheless, acid rain, salty dust deposition, corona discharges, ozone, UV radiation, and humidity among other factors, deteriorate the quality of the polymeric housing reducing their hydrophobicity. The synergistic action of ageing factors is extremely complex and the whole degradation process may change when any one variable is slightly modified. Many studies have been carried out to increase understanding of the physicochemical processes which control the electrical and mechanical stability of polymers during in-service ageing with the objective of predicting remaining life-times. Vital areas of knowledge about polymer insulators are still incomplete and lacking; three of them are: (1) early stages of degradation in service under different environmental conditions, (2) monitoring and diagnosis techniques suitable for distribution installations and (3) steps to establish an insulators management plan based on condition and risk of failure.In this research these three topics are covered. A full review of literature about management of electrical distribution assets is included, followed by a specific plan developed for monitoring, diagnosis and ranking of insulators mainly supported by visual inspections. Diagnosis of medium voltages EPDM insulators recovered from service aged under different conditions is done using both traditional techniques and, uniquely, dielectric impedance. The relationship between surface roughness and static contact angle is also used to characterize insulators’ surfaces. Early stages of degradation are studied focusing the experimental work to evaluate the electrohydrodynamic processes which occur on new samples under different conditions, giving special attention to leakage current pulse analysis, electric field enhancement, and resistance/capacitive behaviour including phase of leakage current. Results from each specific topic offer additional understanding of polymer insulators degradation providing insight to monitoring, diagnosis and management. Additionally, results open new topics in which new investigations are proposed. Advisors/Committee Members: Rowland, Simon.

Subjects/Keywords: composite insulators; ageing; early stages; water droplets; electric field; corona discharges

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APA (6th Edition):

Da Silva domingues, E. (2012). Improved Condition Monitoring of Composite Insulators. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:156246

Chicago Manual of Style (16th Edition):

Da Silva domingues, Elizabeth. “Improved Condition Monitoring of Composite Insulators.” 2012. Doctoral Dissertation, University of Manchester. Accessed January 22, 2020. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:156246.

MLA Handbook (7th Edition):

Da Silva domingues, Elizabeth. “Improved Condition Monitoring of Composite Insulators.” 2012. Web. 22 Jan 2020.

Vancouver:

Da Silva domingues E. Improved Condition Monitoring of Composite Insulators. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2020 Jan 22]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:156246.

Council of Science Editors:

Da Silva domingues E. Improved Condition Monitoring of Composite Insulators. [Doctoral Dissertation]. University of Manchester; 2012. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:156246


McGill University

2. Wiseman, Nicholas. Oxidation in electric discharges.

Degree: PhD, Department of Chemical Engineering, 1971, McGill University

Subjects/Keywords: Electric discharges.; Oxidation.; Corona (Electricity); Hydrogen sulfide.

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APA (6th Edition):

Wiseman, N. (1971). Oxidation in electric discharges. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile70663.pdf

Chicago Manual of Style (16th Edition):

Wiseman, Nicholas. “Oxidation in electric discharges.” 1971. Doctoral Dissertation, McGill University. Accessed January 22, 2020. http://digitool.library.mcgill.ca/thesisfile70663.pdf.

MLA Handbook (7th Edition):

Wiseman, Nicholas. “Oxidation in electric discharges.” 1971. Web. 22 Jan 2020.

Vancouver:

Wiseman N. Oxidation in electric discharges. [Internet] [Doctoral dissertation]. McGill University; 1971. [cited 2020 Jan 22]. Available from: http://digitool.library.mcgill.ca/thesisfile70663.pdf.

Council of Science Editors:

Wiseman N. Oxidation in electric discharges. [Doctoral Dissertation]. McGill University; 1971. Available from: http://digitool.library.mcgill.ca/thesisfile70663.pdf


McGill University

3. Stradal, Milos. Surface treatment of polyethylene in electrical discharges.

Degree: PhD, Department of Chemistry, 1974, McGill University

Note:

Corona treatment in oxygen, nitrogen, helium and argon substantially enhanced the autohesion of low density polyethylene. The power consumed rather than the nature of the gas in the discharge proved to be the important variable controlling the increase in the autohesion. Corona-induced oxidation of polyethylene had a detrimental effect upon bonding. Increase in polymer density and surface roughness lowered the autohesion. The temperature dependence of bonding for both rough and smooth surfaces, either untreated or treated, was similar to the temperature dependence of viscous flow of polyethylene. The rates of decay on aging of surface charge and capacity for autohesion of corona treated polyethylene followed similar trends, increasing with increase in the temperature of storage. However it was shown that the corona-induced autohesion was not due to the presence of surface charge. Corona-induced oxidation of polyethylene was not a prerequisite for the good bonding of printing ink to the surface of the plastic.

Le traitement par corona dans l'oxygène, l'azote, l'hélium et l'argon ont augmenté d'une manière substantielle l'autoadhésion du polyéthylène de faible densité. Il a été démontre que la puissance consommée plutôt que la nature dugaz dans la décharge est le facteur important qui contrôle l'augmentation d'autoadhésion. L'oxydation du polyéthylène induite par corona avait un effet nuisible sur la liaison. L'augmentation de densité du polymère et de la rugosité de la surface ont diminué l'autoadhésion. La dépendance de la liaison a la température pour des surfaces rugueuses et lisses, traitées ou non-traitées, allait de pair avec la dépendance de la température du flux visqueux du polyéthylène. Les vitesses de décroissance de la charge de surface et de la capacité après vieillissement pour l'autoadhésion du polyéthylène traite par corona ont montré des tendances similaires, augmentant avec l'augmentation de température de stockage. Néanmoins, Il a été prouvé que l'autoadhésion induite par corona n'était pas due à la présence de la charge de surface. L'oxydation du polyéthylène induite par corona n'était pas nécessaire a la bonne liaison de l'encre d'imprimerie a la surface du plastique.

Advisors/Committee Members: Goring, D. A. I. (Supervisor).

Subjects/Keywords: Polyethylene; Electric discharges through gases.; Corona (Electricity); Adhesion.; Surfaces.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Stradal, M. (1974). Surface treatment of polyethylene in electrical discharges. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile147958.pdf

Chicago Manual of Style (16th Edition):

Stradal, Milos. “Surface treatment of polyethylene in electrical discharges.” 1974. Doctoral Dissertation, McGill University. Accessed January 22, 2020. http://digitool.library.mcgill.ca/thesisfile147958.pdf.

MLA Handbook (7th Edition):

Stradal, Milos. “Surface treatment of polyethylene in electrical discharges.” 1974. Web. 22 Jan 2020.

Vancouver:

Stradal M. Surface treatment of polyethylene in electrical discharges. [Internet] [Doctoral dissertation]. McGill University; 1974. [cited 2020 Jan 22]. Available from: http://digitool.library.mcgill.ca/thesisfile147958.pdf.

Council of Science Editors:

Stradal M. Surface treatment of polyethylene in electrical discharges. [Doctoral Dissertation]. McGill University; 1974. Available from: http://digitool.library.mcgill.ca/thesisfile147958.pdf

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