Surface Charge and Electric Field Distribution along Tri-post Insulators in ±800 kV GIL

Dong, Jianan; Du, B. X.; Li, J.; Liang, Hucheng; Yao, Hang; Chen, Y.

doi:10.1109/icempe51623.2021.9509193

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…According to well-proven procedures [14][15][16][17][18][19][20], standard devices and HV devices with surface treatment and known materials are designed. The current trends in increasing the surface strength Ep focus mainly on the concept, design, geometric layout of the HV device, and solutions using miniaturization (using microelectronics); one of the related activities then lies in changing the electrical strength of materials, both volumetric and surface ones [23][24][25][26], by choosing the concept and design for the critical part of the device or equipment. The approaches can be characterized and summarized into several categories, as follows:…”

Section: Current State Of the Research And Solutions For The Surface ...mentioning

confidence: 99%

“…Further, a more detailed approach to increase insulation properties according to (a) is outlined in [23], for example, where the authors analyze the results of a multiphysics numerical model of a three-pole insulator in a horizontal arrangement, with the operating voltage Un = ± 800 kV GIL (gas-insulated transmission lines), based on this model; the temperature distribution and gas flow inside the GIL insulator are then determined. A similar issue is addressed, with the support of numerical modeling, by the authors of [25] for the DC-GIL system of the ITER project with Un = 1 MV .…”

Section: Current State Of the Research And Solutions For The Surface ...mentioning

confidence: 99%

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Modification of Insulating Properties of Surfaces of Dielectric High-Voltage Devices Using Plasma

Pernica,

Klíma,

Londák

et al. 2024

Applied Sciences

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Plasma discharges under atmospheric pressure are applicable for modifying the electrical properties of dielectric surfaces. The aim of the plasma discharge treatment of such surfaces is to design a procedure so that its characteristic parameters improve the resulting levels of the breakdown electrical strength Eb when tested under pulsed or alternating electrical voltages. In this research, a set of functional experiments performed by using plasma in samples of two types of materials (thermoset, thermoplastic) were processed and evaluated, and the resulting effect of the magnitude of the breakdown electrical voltage, electrical intensity, and electrical conductivity of the surface were compared. A slit plasma chamber, previously described and parameterized, was employed to treat the surface of the dielectric samples. The surface structure was modified via plasma discharge without precursors, and methodologies were developed to evaluate these modifications with respect to the change in the electrical strength parameters of the insulator surface. Subsequently, the surface strength of the affected and unaffected samples was measured and evaluated as a function of exposure time, and the stability of the modification was assessed. The first methodical test showed that plasma discharge without precursors improved the long-term surface electrical strength of the dielectric surface. The test and its parameters were carried out with respect to feasibility in an industrial environment.

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Section: Current State Of the Research And Solutions For The Surface ...mentioning

confidence: 99%

Section: Current State Of the Research And Solutions For The Surface ...mentioning

confidence: 99%

Modification of Insulating Properties of Surfaces of Dielectric High-Voltage Devices Using Plasma

Pernica,

Klíma,

Londák

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…To compensate for the thermal extension and mechanical strain of the conductors, in addition to the basin insulators, tri-post epoxy insulators are widely used in the GIL [ 15 , 16 ]. The shape of the insulator has a great influence on the electric field distribution, charge accumulation, and creeping discharge process [ 17 , 18 ]. The existing research cannot analyze the insulation characteristics of the tri-post epoxy insulator under the DC superimposed lightning impulse composite voltage.…”

Section: Introductionmentioning

confidence: 99%

Surface Flashover Induced by Metal Contaminants Adhered to Tri-Post Epoxy Insulators under Superimposed Direct and Lightning Impulse Voltages

Liu

et al. 2022

Polymers

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Metal contaminants can distort the surface electric field of the tri-post epoxy insulator and cause serious surface charge accumulation, significantly reducing the insulation performance of the insulator under the superimposed DC and lightning impulse voltage. In this paper, an experimental platform for charge accumulation and surface flashover of tri-post epoxy insulators under the superimposed DC and lightning impulse voltage was built, by surface point measurement and charge inversion calculation, the surface charge distribution characteristics of tri-post insulators with attached particles was experimentally explored and the influence law of attached metal particles on the charge accumulation was discussed. The results show that metal particles can cause a surge in the surface charge density of the tri-post epoxy insulator, forming bipolar charge spots whose polarity is opposite to that of the adjacent electrodes. The adsorbed metal dust can cause the polarity reversal of adjacent surface charges, forming a large-area unipolar charge spot. Moreover, the flashover voltage of a tri-post insulator under DC superimposed lightning impulse voltage with a clean surface and attached metal particle was measured, and the synergistic induction mechanism of charge spot accumulation and metal particle discharge on the flashover along the face of the tri-post insulator is thereby revealed. Compared with the clean insulators, the surface flashover voltages of tri-post epoxy insulators with metal contaminants adhered decrease under the superimposed voltages of different polarities, but the decline amplitude is greater under the heteropolar composite voltage. When adhered to the middle of the insulator leg, the distribution range of bipolar charge spots is the widest, and the surface flashover voltage decreases sharply, which can drop by 32% compared with the absence of particles. In addition, when the metal dust adsorbed by the tri-post epoxy insulator has a wide distribution range, the impact of metal dust on the flashover voltage is greater than that of the attached metal particles, and its hazard cannot be ignored. The research results can provide a reference for the insulation test method and optimal design of the DC tri-post epoxy insulator.

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GPU-Accelerated Field Simulation of HVAC Gas Insulated Lines

Hensel

Henkel

Haußmann

et al. 2022

2022 IEEE 20th Biennial Conference on Electromagnetic Field Computation-Long Papers (CEFC-LONG)

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Surface Charge and Electric Field Distribution along Tri-post Insulators in ±800 kV GIL

Cited by 5 publications

References 9 publications

Modification of Insulating Properties of Surfaces of Dielectric High-Voltage Devices Using Plasma

Modification of Insulating Properties of Surfaces of Dielectric High-Voltage Devices Using Plasma

Surface Flashover Induced by Metal Contaminants Adhered to Tri-Post Epoxy Insulators under Superimposed Direct and Lightning Impulse Voltages

GPU-Accelerated Field Simulation of HVAC Gas Insulated Lines

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