Micro discharges in HVDC gas insulated systems

Schueller, Michael; Gremaud, Robin; Doiron, C. B.; Franck, Christian M.

doi:10.1109/tdei.2015.004835

Cited by 23 publications

(5 citation statements)

References 35 publications

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“…Currently, the widely used physical model of surface charge accumulation [26] holds that the charge accumulation originated from the conduction through the solid insulation, the gas insulation, and the solid-gas surface. The normal component of the electric field near the gas-solid interface affects the charge accumulation through the solid insulation and gas insulation, while the tangential component affects the charge accumulation along with the solid-gas interface.…”

Section: The Surface Flashover Under Different Types Of Electric Fieldsmentioning

confidence: 99%

Towards the surface flashover in DC GIL/GIS: the electric field distribution and the surface charge accumulation

Wu¹,

Xu²,

Zhang³

et al. 2022

Phys. Scr.

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Under DC voltage, the interface charge of the spacer in gas-insulated metal-enclosed transmission lines (GIL) and gas-insulated metal-enclosed switchgear (GIS) is prone to accumulate, and the charge is an important factor to induce surface flashover. This paper concentrates on the surface flashover induced by solid-gas interface charge accumulation in DC GIL/GIS. Firstly, the electric field distribution of the real insulator and the electrode structure commonly used in research are analyzed and summarized into two distribution forms: the tangential-component dominant type and the hybrid type. According to the electric field distribution forms, how the density distribution and electric field distortion of interface charge influence the flashover voltage of spacer is reviewed, and the influence of metal particles on charge and surface flashover is reviewed as well. Finally, the existing physical models of surface flashover induced by interface charge are summarized.

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Section: The Surface Flashover Under Different Types Of Electric Fieldsmentioning

confidence: 99%

Towards the surface flashover in DC GIL/GIS: the electric field distribution and the surface charge accumulation

Wu¹,

Xu²,

Zhang³

et al. 2022

Phys. Scr.

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“…The ion pair generation rate of SF 6 gas is 29 IP/(cm 3 s) under natural ionisation [20]. This value will greatly increase while micro-discharges occur in GIS/GIL or when the GIS/GIL is in an environment with strong radiation (such as ITER).…”

Section: Influence Of Ion Pair Generation Ratementioning

confidence: 99%

“…Recently, ion flow simulations, depending on the ion pair generation rate, found that the dominant surface charge accumulation mechanism is electrical conduction through insulator volume due to natural ionisation [18,19]. However, when a microdischarge occurs, the number of charge carriers in the gas increases greatly [20,21]. In certain circumstances, the homo-charges and the hetero-charges co-exist on the insulator surface, and the homocharge density is much higher than hetero-charge density [22,23].…”

Section: Introductionmentioning

confidence: 99%

Transition of the dominant charge accumulation mechanism at a Gas‐solid interface under DC voltage

Luo

Tang

Pan

et al. 2020

IET Generation, Transmission & Distribution

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“…the D p and D n are calculated to 1.21 × 10 −13 cm 2 /s according to the Einstein equation [23]. Under the natural ionisation condition, the ion pair generation rate in SF 6 is 29 IP/(cm 3 •s) [30]. If there is no special explanation, only the influence of voltage polarity reversal on a surface charge under the natural ionisation condition is calculated.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of surface charge and electric field distributions on basin‐type insulator in GIS/GIL due to voltage polarity reversal

et al. 2020

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In this study, a simulation model of surface charge accumulation has been established. The model considers three accumulation ways, i.e. electrical conduction within the gas, through insulator volume and along the insulator surface. The generation, diffusion, drift and recombination of charge carriers are also taken into account. Based on it, the influence of polarity reversal, reversal time on surface charge and electric field distribution on a basin-type insulator are studied. The polarity of the surface charges and the direction of the electric field change after the voltage polarity reversal. When the preload voltage is equal to reversal voltage, the surface charge and the electric field distributions at steady state before and after voltage polarity reversal are all the same with opposite sign, and not affected by the reversal time. However, the time to reach the steady state varies with different reversal time. The steady-state surface charge and electric field increased with the rise of reversal voltage. The transient normal and tangential electric field would not exceed the value of the steady state, which means voltage polarity reversal has no additional influence on insulation performance. This research can provide guidance to the design and manufacture of DC GIS/GIL.

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Micro discharges in HVDC gas insulated systems

Cited by 23 publications

References 35 publications

Towards the surface flashover in DC GIL/GIS: the electric field distribution and the surface charge accumulation

Towards the surface flashover in DC GIL/GIS: the electric field distribution and the surface charge accumulation

Transition of the dominant charge accumulation mechanism at a Gas‐solid interface under DC voltage

Dynamics of surface charge and electric field distributions on basin‐type insulator in GIS/GIL due to voltage polarity reversal

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