## Electronic Theses and Dissertations

1995

Dissertation

Ph.D.

#### Department

Electrical and Computer Engineering

Watson, Alan,

#### Keywords

Engineering, Electronics and Electrical.

CC BY-NC-ND 4.0

#### Abstract

Six dielectric liquids have been investigated for the confirmation of the EHD theory of current response to the application of ramped high voltage by using a prebreakdown technique. The conduction current and displacement current were measured and studied individually. Upon plotting conduction current as well as displacement current on a log V -log I scale, two linear portions of the current characteristics were observed in the high stress regime. Thus two separate regimes of the characteristic were found exhibiting current transport in direct proportion to a simple power of the applied voltage, $\rm I\propto V\sp{s}$ (or $\rm I \propto V\sp{g}$ with respect to displacement current), where s (or g) represented upper s$\sb{\rm u}$ (or g$\sb{\rm u}$) and lower slope s$\sb{\rm l}$ (or g$\sb{\rm l}$) values. The impact of the developments on the relationship between the maximum applied voltage and the power law is discussed. The relationship referred to is one involving both s values merging to 3/2 when the electric field becomes large. A new approach using a computer modelling process for these EHD studies will be presented. Attention will also be given the magnetic field effect observed from the final series of displacement current measurements. A turbulence phenomenon in dielectric liquids has been discovered from a special experiment performed in order to verify the nature of dielectric liquid behaviour under high applied electric field conditions.Dept. of Electrical and Computer Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1995 .R46. Source: Dissertation Abstracts International, Volume: 57-07, Section: B, page: 4614. Adviser: Alan Watson. Thesis (Ph.D.)--University of Windsor (Canada), 1995.

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