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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, a 3 μm gate length self-aligned, depletion mode GaAs metal insulator semiconductor field effect transistors exhibiting transconductances, typically in the vicinity of 160 mS/mm.
Abstract: We have fabricated 3 μm gate length self‐aligned, depletion mode GaAs metal insulator semiconductor field effect transistors exhibiting transconductances, typically in the vicinity of 160 mS/mm. This achievement is attributed to the use of Si3N4 as the gate dielectric with a few monolayers of a Si/Ge interface layer between the GaAs channel layer and the insulator. The Si3N4/Si/Ge insulator structure is grown in situ using a plasma‐enhanced chemical vapor deposition system which is connected by an ultrahigh vacuum transfer tube to an adjacent III‐V molecular beam epitaxy system. Nearly ideal capacitance‐voltage curves (compared to previous publications) suggest the existence of a high quality insulator/semiconductor interface. The lowest interface trap density that has been measured, as determined from the magnitude of the conductance peak is ∼2×1011 eV−1 cm−2.

27 citations

Journal ArticleDOI
TL;DR: In this paper, various types of insulators have been energized with ±250 kV dc voltage and exposed to natural conditions by the seaside continuously for about two years, and the influence of dc voltage application on the salt deposit density was not so notable as expected, while the effect of insulator types on the voltage withstand strength was greater than anticipated.
Abstract: Various types of insulators have been energized with ±250 kV dc voltage and exposed to natural conditions by the seaside continuously. Salt deposit density and flashover phenomenon of these insulators have been investigated extensively for about two years. According to the results obtained so far, the influence of dc voltage application on the salt deposit density was not so notable as expected, while the effect of insulator types on the voltage withstand strength was greater than anticipated.

27 citations

Patent
13 Mar 1991
TL;DR: In this paper, a tubular insulator combined with a surge arrester is used to protect a cable, its termination or other apparatus from the effect of lightning strikes on an overhead line to which the apparatus is connected.
Abstract: An electric protective device for protecting a cable, its termination or other apparatus from the effect of lightning strikes on an overhead line to which the apparatus is connected comprises a tubular insulator combined with a surge arrester and integrated by common terminals at the ground and high voltage ends. The insulator and the surge arrester are concentrically disposed about the conductor in a common insulated structure to eliminate connecting leads therebetween and the voltage drop which occurs across such leads during a rapid rise in current. The surge arrester may contribute all or part of the electrical stress grading required in the termination.

27 citations

Journal ArticleDOI
TL;DR: In this article, a two-layer structure pipe is designed to lower the surface potential after leader discharge, and the residual surface charge density distribution under 23.5kV application voltage is given, and numerical characteristics of residual charge in the leader channel and streamer channel are analyzed.
Abstract: A charge density distribution scanning system is fabricated using an electrostatic probe, which utilizes DC voltage feedback principle to nullify the electric field between the probe and charged insulator surface. A two-layer structure pipe is designed to lower the surface potential after discharge. In this way, the surface potential distribution caused by the residual charge of leader discharge under the impulse application voltage up to 40 kV can be measured. In this Letter, the residual surface charge density distribution under 23.5 kV application voltage is given, and the numerical characteristics of residual charge in the leader channel and streamer channel are analyzed.

27 citations

Journal ArticleDOI
TL;DR: In this article, a numerical solution of the linear complex Poisson equation was proposed to solve arc-overs on moist or contaminated insulators in high-voltage power plants, where the electrostatic field of the charge-free space prevails; essentially below a critical voltage U/sub k/n.
Abstract: This paper deals with the numerical solution of the linear complex Poisson equation. The practical background of posing this problem are arc-overs on moist or contaminated insulators in high-voltage power plants. The electrostatic field of the charge-free space prevails; essentially below a critical voltage U/sub k/. However, the dielectric material loses its insulating characteristics above U/sub k/. It becomes the carrier of a discharge which builds up a conducting connection along the insulator. It is a matter of slowly varying fields (50 Hz), for which the displacement current is a significant quantity. These slowly varying fields can be determined by solving a complex potential problem. Discretization leads to a complex system of linear equations with symmetric matrix. This system is solved by various modern conjugate gradient-type methods. Numerical simulations for test and real life problems are presented.

27 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023368
2022892
2021224
2020478
2019561
2018629