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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 paper, the authors made an investigation of various factors which affect the flashover values across polyethylene and tetrafluoroethylene surfaces in vacuum, including sample conditioning under sustained direct and power frequency voltages, and the effect of surge voltage waveshape.
Abstract: Investigations were made of various factors which affect the flashover values across polyethylene and tetrafluoroethylene surfaces in vacuum. The factors studied included sample conditioning under sustained direct and power frequency voltages, and the effect of surge voltage waveshape. The breakdown values for a given voltage waveshape increased with the time of conditioning up to a maximum value which then remained constant within about 10%. Alternating voltages were found to be more effective in the conditioning process. The average breakdown voltage for each insulator decreased with increasing the surge front duration from 1 μs to about 150 μs and thereafter remained constant.

25 citations

Journal ArticleDOI
TL;DR: In this article, a surface charge measurement system which could achieve temperature control was constructed, and a model insulator with truncated cone type was employed, as well as two types of high-voltage electrodes, i.e. plate and needle electrodes.
Abstract: During the operation of gas insulated switchgear (GIS) and gas insulated line (GIL), the conducting bar generates joule heat, and a non-uniform distribution of temperature forms in the bulk of the insulators. As the load varies, the temperature distribution changes, and it has an influence on the bulk conductivity of the insulators. Moreover, the surface charge accumulation can be affected. In order to clarify this, a surface charge measurement system which could achieve temperature control was constructed, and a model insulator with truncated cone type was employed, as well as two types of high-voltage electrodes, i.e. plate and needle electrodes. It is found that both polarities of charges existed on the insulator surface when a dc high voltage was applied to the plate or needle electrode, and homo-charge density was much higher than that of hetero-one. As for the plate electrode, homo-charges resulted from micro-discharges, while generated by corona in the case with needle electrode. As temperature increased, homo-charge density decreased, kept unchanged and increased for three cases, respectively, i.e. when dc voltage was applied to the plate electrode, and when voltage of 3 and 20 kV was applied to the needle electrode. Moreover, a simulation model involving multi-physics was established, which included heat conduction in solid and transient field changing from the initial capacitive to stationary resistive field distribution. It is proved that the electric conduction of the insulator bulk contributed to the accumulation of hetero-charges, and temperature could enhance this. Besides, when temperature increased, the corona inception voltage reduced, and hence the homo-charge density increased. Due to the effect of neutralization and the differences in the sensitivity of corona with different intensity to temperature, the tendency of homo-charge density changing with temperature for the three cases showed distinct in the experiments.

25 citations

Book ChapterDOI
01 Jan 2013
TL;DR: In this paper, surface electric charge accumulations and contaminate particles are found to be influential when they significantly perturb the surface fields, and the flashover path will follow the surface from electrode to electrode, or jump from the surface through the gas or into the solid itself.
Abstract: Surface flashover along a gas/solid interface is an important limiting factor for the withstand voltage and the reliability of compressed-gas-insulated equipment. The flashover process may be viewed as comprised of two parts: inception and propagation. Both of these have been studied and are shown to be influenced by the applied field and its perpendicular and tangential components at the insulator surface. Surface electric charge accumulations and contaminate particles are thus found to be influential when they significantly perturb the surface fields. The flashover path will follow the surface from electrode to electrode, or, when perpendicular component fields are high, may jump from the surface through the gas or into the solid itself. Experimental results in systems where the applied surface field distribution was controllable are used to confirm the basic phenomena and models.

25 citations

Journal ArticleDOI
TL;DR: The internal discharge monitor (IDM) as mentioned in this paper was designed to observe electrical pulses from common electrical insulators in space service, and it was flown on the Combined Release and Radiation Effects Satellites (CRRES).
Abstract: The internal discharge monitor (IDM), designed to observe electrical pulses from common electrical insulators in space service, is described. The IDM was flown on the Combined Release and Radiation Effects Satellites (CRRES). The 16 insulator samples included G10 circuit boards, FR4 and PTFE fiberglass circuit boards, FEP Teflon, alumina, and wires with common insulations. The samples were fully enclosed and mutually isolated, and space radiation generated 0.02 cm. >

25 citations

Patent
21 Dec 2000
TL;DR: In this paper, a sensor and associated circuits are provided for on-line monitoring of the state of the high-voltage insulation in the electrical system, both the power frequency signal and of the radio frequency signals associated with partial discharge activity may be monitored and transmitted from the sensor to remote monitoring instrumentation.
Abstract: For an electrical system a sensor and associated circuits are provided for on-line monitoring of the state of the high-voltage insulation in the electrical system. In this arrangement, both the power frequency signal and of the radio frequency signals associated with partial discharge activity may be monitored and transmitted from the sensor to remote monitoring instrumentation. The sensor is disposed in a stand-off insulator which also may act to support the high voltage conductor system.

25 citations


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