Topic
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.
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TL;DR: In this article, the effect of oxygen nonstoichiometry on the electrical transport characteristics of ZnO1−δ films was thoroughly investigated and it was shown that the transition from band-gap insulating state (for the films prepared at high oxygen environments) to Anderson localized insulating states (for those prepared at lower oxygen environments).
Abstract: We have thoroughly investigated the effect of oxygen nonstoichiometry on the electrical transport characteristics of ZnO1−δ films. These films were grown on optical grade quartz substrates by using a pulsed laser deposition technique. In order to alter the amount of oxygen nonstoichiometry (δ), oxygen partial pressure during the film growth was systematically varied from 102Torrto10−5Torr. Qualitative estimates about the amount of oxygen nonstoichiometry in these films were made using Raman Spectroscopy data. High resolution electrical resistivity and thermoelectric power measurements were performed in the temperature range 12–300K. A detailed analysis of electrical transport data showed a transition from band-gap insulating state (for the films prepared at high oxygen environments) to Anderson localized insulating state (for the films prepared at lower oxygen environments).
26 citations
TL;DR: In this paper, the propagation of corona discharges over the surfaces of cylindrical PTFE and porcelain insulators under positive impulse voltages has been investigated.
Abstract: Experiments are described on the propagation of corona discharges over the surfaces of cylindrical PTFE and porcelain insulators under positive impulse voltages. A rod-plane electrode arrangement has been used to which a single value of peak voltage, with the same impulse profile, has been applied throughout. Quantities measured were inception times and voltages, corona current and light output at selected axial regions of the corona. Still photographs of the corona appearance have been taken. Comparison has been made between the surface corona and that in air alone. Interpretation is based on knowledge of the electric field profiles, as modified by the insulators and the possible effects of the surface on the discharge. These are discussed in terms of the presence or absence of charge attachment, the effects of the surface on electron production and the effect of the permittivity of the materials
26 citations
TL;DR: The first polymer insulator for AC transmission lines was developed in the late 1950s as mentioned in this paper, which consisted of a flexibilized epoxy resin weathershed cast onto a fiberglass rod, and field trials on a 138-kV line took place in 1959.
Abstract: The first polymer insulator for AC transmission lines was developed in the late 1950s. This insulator consisted of a flexibilized epoxy resin weathershed cast onto a fiberglass rod, and field trials on a 138-kV line took place in 1959. Insulators failed almost immediately on energization due to severe tracking and erosion of the bisphenol-A epoxy material, which was later, through inclined-plane tests, shown to be inherently unsuitable for use in outdoor insulation [1].
26 citations
18 Nov 2010
TL;DR: In this article, a Rotating Wheel Tracking and Erosion Tester (RWT) was used to compare the aging performance of different insulators under AC and DC (both polarities) excitation.
Abstract: An experimental study was conducted, using a Rotating Wheel Tracking and Erosion Tester (RWT) with the aim to compare the aging performance of different insulators under AC and DC (both polarities) excitation. The procedures of the standard were adapted to perform AC and DC (both polarities) tests on 6 practical insulators from different manufacturers, representing different materials and specific creepage distances. The results obtained confirm the extreme severity of the test, especially for the silicone rubber insulators. The DC tests turned out to be more severe than the AC tests. The formation of a brown deposit on the insulator surface was observed and investigated.
26 citations
01 May 1995
TL;DR: In this article, a long pulse (>1 /spl mu/s) high voltage testing of small hard seal samples was performed in the presence of a 1 kA electron beam and the results indicated that a 1.0 to 4.0 increase in the breakdown electric field stress is possible with this technology.
Abstract: Insulators composed of finely spaced alternating layers of dielectric and metal are thought to minimize secondary emission avalanche (SEA) growth. Most data to date was taken with small samples (order 10 cm/sup 2/ area) in the absence of an ion or electron beam. We have begun long pulse (>1 /spl mu/s) high voltage testing of small hard seal samples. Further, we have performed short pulse (20 ns) high voltage testing of moderate scale bonded samples (order 100 cm/sup 2/ area) in the presence of a 1 kA electron beam. Results thus far indicate a 1.0 to 4.0 increase in the breakdown electric field stress is possible with this technology.
26 citations