Insulator (electricity)

About: Insulator (electricity) is a research topic. Over the lifetime, 15941 publications have been published within this topic receiving 108950 citations. The topic is also known as: electrical insulator.

Electric field calculation for an axially-symmetric insulator with surface contamination

Abstract: The classical method of integral equations was applied to determine the electrostatic field distribution on an insulator coated with a thin homogeneous surface layer. Results of calculations of the electric potential and the electric field on both uniformly and nonuniformly polluted model insulators coated with layers of different surface conductivities are presented in this paper. An application of this method to the determination of distribution of the electrostatic field on a polluted longrod insulator has been demonstrated. >

Propagation velocity of cathode-initiated surface flashover

Abstract: A polymethyl methacrylate insulator rod in vacuum is stressed by high‐voltage pulses having 3‐ns rise times, with the result that 40‐mm‐long incomplete discharges occur at the end of the rod. Time‐resolved measurements of electron emission from different areas on the insulator surface indicate that a discharge propagates toward the anode at approximately 2×107 m/s during a pulse. A velocity of this order is expected if surface flashover results from an avalanche of electrons due to secondary emission at the insulator surface. Dependence of the velocity on the angle of the electric field relative to the insulator surface is predicted.

Shielded insulation for combustion chamber

Abstract: In an uncooled engine, it is propose to form insulator coatings on the combustion chamber surfaces, and to mechanically protect such coatings against erosion or cracking by means of outer protective layers applied over the insulator coatings. The insulator coatings can be zirconium oxide applied to a thickness of approximately 0.15 inch. The protective layers can be formed of various materials resistant to high temperatures in the vicinity of 2000° F., e.g. silicon nitride, steel or cast iron.

Diamond insulator devices and method of fabrication

Abstract: Semiconductor device and circuits and methods of fabrication which provides multilevel interconnections with grown diamond insulation films and second level resistors in the diamond insulation. The diamond provides both good electrical insulation and good thermal conductivity. The methods also provide capacitors with second level diamond dielectrics.

Electric field and energy computation on wet insulating surfaces

Abstract: The paper presents the results of electric field and energy computation on insulating surfaces covered by water in the form ranging from small discrete droplets to large wet patches. The goal of this study was to understand the differences in the flash-over performance of outdoor insulators, in particular nonceramic insulators, under contaminated conditions as a function of surface wettability. The computational algorithm is based on the charge simulation method. A decrease in the maximum electric field at the water droplet tip is obtained as the droplet size increases, however, the electrostatic potential energy increases with the size of the water droplet, which might increase the surface discharge intensity. The role of the coalescence of small water droplets into larger droplets and filaments on the electric field and energy has been investigated. The location of such larger water bodies with respect to the electrodes has been examined. These computations shed some light not only on the role of hydrophobic surfaces but also on the location of hydrophobic surfaces along the insulator on the flashover performance of outdoor insulators. It has been shown that these computations provide quantitative data that compliments information obtained from simpler techniques such as visual observation and surface resistance measurements, for the purpose of assessing the performance of insulators in service.