Title :
Effects of thermal and viscous drag forces on AC breakdown characteristics of transformer oil
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
Abstract :
The dielectric strength of transformer oil under the influence of temperature and flow conditions was studied experimentally. As a function of flow rates (0 to 65 mL/s), the dielectric strength increased flow by ~10%. As a function of temperature (20 to 100°C), the dielectric strength fell rapidly near the boiling temperature of water (> 80 °C), and increased with temperature between 20 and 80°C. It is concluded that the variations in the observed breakdown strength of the oil studied (Voltesso 35) can be related to variations in the solubility of water vapor and gases in the oil, and effect stress-induced liquid motion on particles and gas bubbles
Keywords :
bubbles; electric breakdown; electric strength; solubility; transformer oil; 20 to 100 degC; AC breakdown characteristics; Voltesso 35; boiling temperature; dielectric strength; flow rates; gas bubbles; solubility; stress-induced liquid motion; thermal forces; transformer oil; viscous drag forces; water vapor; Circuit faults; Dielectric breakdown; Electric breakdown; Oil insulation; Petroleum; Power system reliability; Power transformer insulation; Temperature; Testing; Thermal force;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1993. Annual Report., Conference on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-0966-9
DOI :
10.1109/CEIDP.1993.378940
