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The dielectric strength of liquids has been found to depend on electrode area. A study of 1600 observations of transformer oil breakdown, using four pairs of uniform-field (Rogowski) gaps, has established the extremal(1) nature of such breakdown distributions, and yielded an area-effect equation which agrees closely with test results.
The new AIEE Committee on Dielectrics will promote the symposia on all aspects of the field of dielectrics ranging from theory to applications involving more than one type of apparatus. The principal purpose of the Committee will be to serve the design and development engineers who must apply this information to practice. The scope will include the treatment of all phases of the field including solids,...
Flashover strength has been measured for a group of solid insulating materials at several frequencies in the range from 60 cycles per second (cps) to 100 megacycles per second. The effects of exposure at nine conditions of temperature and relative humidity have been studied over the temperature range from −55C to 125C. The flashover voltage was measured across a 3/8 inch gap between 3/4 inch diameter...
Some sixty-six years ago, Sir Oliver Lodge machined a lens from a slab of hardened pitch and demonstrated that it had a beaming effect on the radiation from a spark-gap oscillator. While he was perhaps the first man to show that a lens would function as an aerial, he was by no means the first to propose that it would do so. In 1860 Clerk Maxwell designed a two-dimensional lens in which the refractive...
In the course of the investigation of the relations between microwave absorption and molecular structure in liquids, a question arose as to the effect of dipole orientation, in non-spherical molecules, on relaxation time. In order to investigate this effect, the critical wavelengths and viscosities of trioxane, pyridine, paraldehyde and collidine were measured at a number of temperatures. The results...
Guanidine aluminum sulfate hexahydrate is ferroelectric over a large range of temperatures including room temperature. It is the parent of a family of materials in which the aluminum cation and the sulfate anion can be replaced by the anions and trivalent cations which form alums, for example Ga3+, Cr3+, and SeO4−. Replacement of guanidine has so far proved impossible, The material is trigonal, with...
The present requirements for establishing standard corona tests may be divided essentially into the following categories: 1. To establish a realistic test procedure for differentiating relatively among electrical insulating materials with regard to their ability to resist the direct action and by products of corona. 2. To establish standard corona measuring and calibrating circuits and to define the...
In the past decade fluorine chemistry has advanced very rapidly and many completely fluorinated compounds have become available. These compounds, termed perfluorocarbons, were generally much more stable and inert than chlorocarbons, or chloro-fluorocarbons. Many of these high molecular weight perfluorocarbons are reported(1) to have unusually high dielectric strength whereas the lowest molecular weight...
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