Electrical measurements of perfluorinated polyethers were performed to determine the suitability of this class of material as a liquid dielectric. Measures of the breakdown strength and streamer inception voltage are obtained under electrical impulse stress. The breakdown strength is nearly independent of polarity. Under high magnification photography the cathode-originated streamers are seen to have a subsonic mode of growth. The transition to fast growth occurs on time and spatial scales shorter than those found in liquid hydrocarbons. The gas-phase electrical properties and the high heat of vaporization of this material are considered as mechanisms for this behavior.
The inception and structure of prebreakdown streamers in perfluorinated polyethers / C., Fenimore; K. L., Stricklett; H., Yamashita; H., Kawai; E. O., Forster; Pompili, Massimo. - STAMPA. - (1990), pp. 430-435. (Intervento presentato al convegno 10th International Conference on Conduction and Breakdown in Dielectric Liquids tenutosi a Grenoble, Fr nel 10 September 1990 through 14 September 1990) [10.1109/icdl.1990.202938].
The inception and structure of prebreakdown streamers in perfluorinated polyethers
POMPILI, Massimo
1990
Abstract
Electrical measurements of perfluorinated polyethers were performed to determine the suitability of this class of material as a liquid dielectric. Measures of the breakdown strength and streamer inception voltage are obtained under electrical impulse stress. The breakdown strength is nearly independent of polarity. Under high magnification photography the cathode-originated streamers are seen to have a subsonic mode of growth. The transition to fast growth occurs on time and spatial scales shorter than those found in liquid hydrocarbons. The gas-phase electrical properties and the high heat of vaporization of this material are considered as mechanisms for this behavior.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
