Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.464152
Title: Optical studies of the pre-breakdown mechanism in dielectronic liquids
Author: McGrath, P. B.
Awarding Body: Queen Mary, University of London
Current Institution: Queen Mary, University of London
Date of Award: 1977
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Abstract:
The work described in this thesis provides an optical study of pre-breakdown events in liquid dielectrics. A small scale rig employing a 50SI test cell with viewing windows, as part of a high voltage co-axial line, enabled short rise time pulses to be applied to a non-uniform test gap. For the liquid dielectric, changes of refractive index resulting from applied voltage were rendered visible by means of a Schlieren optical system. A high speed image converter camera enabled rapidly changing pre-breakdown phenomena to be photographically recorded at framing speeds up to 107 per second. Scattered light photographs were taken by orthogonal flash illumination under both pulse and direct voltage conditions, allowing large format macrophotography. Using a piezoelectric transducer placed within the test cell, and a photomultiplier to view the gap region, a relationship has also been established between the generation of mechanical waves, light scintillation and conduction current pulses. From the photographic records and conventional parameter measurements there exists strong evidence for the presence of a gaseous phase in processes leading to the electrical breakdown of liquid dielectrics even under pulse conditions.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.464152  DOI: Not available
Keywords: Electronic Engineering
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