Corona Discharge on Liquid Dielectrics

Abstract

CORONA discharge has long been known to take place in engineering dielectrics. The significance of the discharge in deteriorating organic dielectrics, particularly "solid-type" high-voltage underground cables, has been investigated by The Detroit Edison Company over a period

A Statistical Theory of Discoloration for Halogen-containing Polymers and Copolymers

“…Lewis and Calvin have shown that for these compounds, the square of the wave length of the first absorption maximum increases linearly with n, while the intensity of absorption (as measured by the maximum extinction coefficient) is also a linear function of n. Still other examples of linear conjugated systems are well known; /3-carotene, for example, with its vivid yellow color, has eleven double bonds in conjugation. and Piper (42) have polymerized phenylacetylene to obtain reddish colored polymers. Tuttle and Jacobs (44) have prepared polymers of phenoxyacetylene possessing a red color with an absorption maximum at 4200 A.…”

Liquid Dielectrics

“…To minimize the number of variables, the authors prepared numerous systems consisting of liquid paraffin and one or more highly purified compounds selected to represent types of products that might be found in or formed in insulating oils during deterioration, and investigated the power factors and related properties of these systems. The systems investigated were prepared to simulate deteriorated oils containing oilsoluble oxidation products (IS, IS), sparingly soluble oxidation products (11), copper and lead soaps such as are formed by oxidation of oils in contact with these metals (8), and products resulting from corona discharge on insulating oils (16). For concentrations of contaminants that could reasonably be expected to be formed in service, significantly high power factors have been found only when one component of the contaminant is by itself incompletely soluble in the oil.…”