Breakdown characteristics of particle-contaminated HVDC GIL under superimposed voltage of DC and impulse

Ma, Jingtan; Zhang, Qiaogen; Wu, Zhicheng; Guo, Cheng; Wen, Tao; Wang, Guoli; Gao, Chao

doi:10.1109/tdei.2018.007053

Cited by 19 publications

(11 citation statements)

References 23 publications

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“…To realize a large capacity of electric power, long-distance transmission and interconnection between different power systems, HVDC transmission technology has gained rapid development [1][2] . The Gas Insulated Line (GIL), which is insulated by gas, is widely used because it is little affected by the environment and is stable and reliable [3][4] . Basin-type insulators made of epoxy resin are widely used in GIL.…”

Section: Introductionmentioning

confidence: 99%

Effects of plasma treatment on surface insulation properties of epoxy composites

He,

2023

J. Phys.: Conf. Ser.

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The surface of epoxy composite material working in DC electric field for a long time is easy to accumulate charge and cause flashover, which seriously reduces its insulation level and poses a threat to the safe operation of electrical equipment. In this study, SiO x films were deposited on the surface of nano-SiO2/ER nanoparticles by atmospheric pressure dielectric barrier discharge plasma vapor deposition technology using ethyl nor-silicate as a precursor. The effects of different deposition time on the deposition effect and the pressure level of the film surface were studied. Scanning electron microscope and atomic force microscope were used to characterize the surface morphology of the material, and the flashover voltage before and after deposition was measured. The results show that SiO x films of different thicknesses can be formed on the surface of the material at different times of plasma deposition. After extending the deposition time of the film, the film becomes more uniform and dense, the surface roughness of the material decreases continuously, and the electrical conductivity and flashover voltage along the surface increases continuously. After 10 min plasma treatment, the conductivity increased from 1.78×10−16 S to 2.3×10−13 S, while the flashover voltage along the surface increased from 19.29 kV to 22.66 kV, an increase of about 17.5%.

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Section: Introductionmentioning

confidence: 99%

Effects of plasma treatment on surface insulation properties of epoxy composites

He,

2023

J. Phys.: Conf. Ser.

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“…The particles near the insulator will not only directly distort the electric field on the insulator surface but also aggravate the accumulation of surface charges and cause serious harm to the electrical performance of insulators [4]. Linear metal particles have a more serious impact on the surface charge accumulation than metal particles of other shapes [5,6]. Due to the high electric field at the end of linear metal particles, micro-discharge is likely to occur and generate free charges.…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Metal Particle on Surface Charge Accumulation Behavior of Epoxy Insulator with Zoning Coating

2022

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Epoxy insulators are widely used in Gas-Insulated Transmission Lines (GILs), playing a significant role in electrical insulation and mechanical support. The metal particles generated during the production and operation of the equipment aggravate surface charge accumulation on the insulator, causing surface flashover. Therefore, it is necessary to study the suppression strategy of charge accumulation. In this paper, a downsized disc insulator was taken as the research object to investigate the effect of zoning coating on charge suppression with the presence of a linear aluminum metal particle under negative DC voltage. The zoning coating method was achieved by painting coatings with different conductivities in three areas on the insulator surface to regulate the charge. The inhibition mechanism of zoning coating on the charge accumulation in the presence of a linear metal particle was analyzed with the assistance of numerical simulation. The results showed that negative charges were accumulated in the nonplanar region as there was no metal particle, and the existence of metal particles led to the significant accumulation of positive charge speckles in the nonplanar region. The application of zoning coating could significantly inhibit the charge accumulation in the nonplanar area of the insulator and the charge injection from the grounded electrode to reduce the charge density. Under −25 kV, the maximum charge density on the insulator with the zoning coating was 48.1% lower than that without the coating, and the inhibition effect increased by 57.9% when the metal particle was introduced. This paper provides a new way to suppress the charge accumulation on the insulator surface.

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“…Although PD attributes, with lightning impulses and switching impulses, have also been investigated broadly to inspect the discharge characteristics [1,[17][18][19][20], prior studies have mainly concentrated on a single class of voltage, i.e., the DC voltage or impulse voltages, which have been exerted alone, without considering the consequences of a superimposed AC or DC and impulse voltage. Some researchers studied the combined effect experimentally [21][22][23][24][25] but they lack the mathematical modelling that can easily estimate and predict the breakdown under such superimposed voltage conditions. Therefore, it will be meaningful to investigate, systematically, the breakdown activities, with impulse voltages superimposed on a pre-stressed DC voltage for the GIS insulation.…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have performed experimental studies [21][22][23][24][25]31] in order to find the breakdown characteristics under the superimposed lightning impulses on the prestressed DC high-voltages. However, no mathematical modelling was available in the literature in order to estimate and/or validate these experimental results.…”

Section: Introductionmentioning

confidence: 99%

The Estimation of Lightning Impulses Superimposed onto Pre-Stressed DC Breakdown Voltages Using the Leader Propagation Method

et al. 2022

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The impulse breakdown attributes are of rudimentary importance in the insulation coordination in the gas-insulated switchgear (GIS). The critical voltage waveshape for the insulation is the surge over voltages. Usually, such over-voltages will emerge on the electrical equipment while these are burdened under DC or AC working voltages. Therefore, during relatively small-time intervals, the undermined devices are exposed to surge voltages that are superimposed upon the already running DC or AC voltages. From a safety point of view, and for providing reliable power to the consumer, we need to study the breakdown characteristics under such over-voltages, with reference to normal operating voltages (DC or AC). The breakdown mechanism of the GIS under compressed SF6 gas is known to be controlled by a stepped leader propagation method. Although different experimental studies have been conducted by many researchers for different experimental conditions under DC, AC, or impulse high voltages alone, not much research has been performed, in a systematic way, to model and estimate the breakdown voltages of the GIS under such superimposed conditions. This paper presents a systematic model, using a leader propagation technique for the estimation of breakdown voltages for complex voltage conditions, i.e., a lightning impulse (LI) superimposed on pre-stressed DC for different experimental conditions. The estimated values are in good agreement with the measured experimental results.

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Breakdown characteristics of particle-contaminated HVDC GIL under superimposed voltage of DC and impulse

Cited by 19 publications

References 23 publications

Effects of plasma treatment on surface insulation properties of epoxy composites

Effects of plasma treatment on surface insulation properties of epoxy composites

The Effect of a Metal Particle on Surface Charge Accumulation Behavior of Epoxy Insulator with Zoning Coating

The Estimation of Lightning Impulses Superimposed onto Pre-Stressed DC Breakdown Voltages Using the Leader Propagation Method

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