Surface charge measurements on epoxy spacer in HVDC GIS/GIL in SF6

Vu-Cong, T.; Zavattoni, L.; Vinson, Paul; Girodet, A.

doi:10.1109/ceidp.2016.7785506

Cited by 27 publications

(15 citation statements)

References 7 publications

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“…There is a large temperature range along the epoxy spacers, thus it is important to study the temperature effects on the surface charge and electric field distribution. Figure 3 shows the simulated surface charge distribution on the basin-type spacer, which is similar to the measured results in paper [9,11]. The conductor temperature is set to 350 K. The color variation from red to blue represents the Table 3.…”

Section: Effects Of Surface Chargesupporting

confidence: 67%

“…In order to improve the reliability of GIS/GIL, researches aiming on the surface charge measurement and simulation have been conducted worldwide [6][7][8]. Some researchers built a scaled-down GIS/GIL and measured the surface charge distribution on the spacers [9][10][11][12]. Their measurements were conducted offline because the applied voltage on the conductor can easily cause damage to the electrostatic probe.…”

Section: Introductionmentioning

confidence: 99%

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Electrical Field Distribution along HVDC GIL Spacer in SF 6 /N 2 Gaseous Mixture

Du¹,

Jin²,

Liang³

2019

Electric Power Conversion

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Many researchers have proposed a variety of mathematical models to simulate the surface charge accumulation process of DC-GIS/GIL spacers. However, few of them took the gas collision ionization and charge trapping-detrapping process into consideration. This chapter combined the plasma hydrodynamics and charge transport equations and built a modified model. Some conclusions are shown as follows: for the basin-type spacer, the surface charge has the same polarity as the applied voltage on the lower surface but the opposite polarity on the upper surface. For the disc-type spacer, the surface charge has the same polarity as the applied voltage near the shell but the opposite polarity near the conductor under negative voltage. But under positive voltage, negative charge exists almost on the whole surface. The most serious distortion of the electric field occurs at the triple junction of epoxy spacer. Under load condition, there is an obvious temperature rise on the conductor due to joule heating, which has a great influence on the electric field distribution. The application of shielding electrodes has the function of field grading at the triple junction, which can be referred in the DC GIS/GIL design.

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Section: Effects Of Surface Chargesupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Electrical Field Distribution along HVDC GIL Spacer in SF 6 /N 2 Gaseous Mixture

Du¹,

Jin²,

Liang³

2019

Electric Power Conversion

View full text Add to dashboard Cite

show abstract

“…35. In order to study the influence of local surface roughness of electrodes on the surface charge accumulation, Thanh et al [16] performed an experiment on the real‐size 170 kV GIS/GIL spacer using electrodes with different roughness levels. Trek341B was used to measure the surface potential, which has a very large measurement range as shown in Table 1.…”

Section: Discussion and Outlooksmentioning

confidence: 99%

“…It has been widely used by researchers in China, Japan, German, France, Switzerland, etc. [15–17, 46–55]. As an oscillating feedback capacitive probe, the Calvin probe is a typical representative of an active electrostatic probe [47].…”

Section: Surface Potential Measurement Methodsmentioning

confidence: 99%

“…The investigation of the surface charge origin and charge‐related surface breakdown phenomena therefore have been regarded as hot topics over the past few decades [6–13]. Surface charge accumulation can be due to the following aspects: gas phase ionisation, metal particles, cosmic radiation, charge transport inside volume [14–19], etc. As a basis of studying the surface charge behaviour, the surface potential of a charged surface must be measured, and an inversion algorithm is usually used to obtain the surface charge density distribution [20, 21].…”

Section: Introductionmentioning

confidence: 99%

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Gas–solid interface charge characterisation techniques for HVDC GIS/GIL insulators

Zhang

Lin

et al. 2020

High Voltage

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Surface charge accumulation on the spacers is one of the key issues restraining the development of HVDC GIS/GIL. The precise measurement of surface charge properties provides the basis for further study of the surface charge transport mechanism as well as the charge-induced flashover mechanism under DC voltage. In this study, the authors discuss their perspective on the current status, development needs and potential developing orientation of surface charge characterisation techniques. Different surface potential measurement methods and charge inversion algorithms are reviewed regarding the previous studies and future research needs. Drawbacks and outlooks of surface charge measurement techniques are also discussed with the background of laboratory experiment results and on-site measurements. It is hopefully that this study can serve as a useful guide reference for researchers within the same research field. More importantly, it is authors' hope that this study can inspire some novel ideas for readers into developing of more accurate and scientific interface charge characterisation techniques.

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Ultralow Resistance Two‐Stage Electrostatically Assisted Air Filtration by Polydopamine Coated PET Coarse Filter

Tian

Gao

et al. 2021

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Airborne particulate matters (PM) pose serious health threats to the population, and efficient filtration is needed for indoor and vehicular environments. However, there is an intrinsic conflict between filtration efficiency, air resistance, and service life. In this study, a two‐stage electrostatically assisted air (EAA) filtration device is designed and the efficiency‐air resistance‐filter life envelope is significantly improved by a thin coating of polydopamine (PDA) on the polyethylene terephthalate (PET) coarse filter by in situ dopamine polymerization. The 8 mm thick EAA PDA‐140@PET filter has a high filtration efficiency of 99.48% for 0.3 µm particles, low air resistance of 9.5 Pa at a filtration velocity of 0.4 m s−1, and steady performance up to 30 d. Compared with the bare PET filter, the penetration rate for 0.3 µm particles is lowered by 20×. The coated PDA is of submicron thickness, 10−3 × the gap distance between filter fibers, so low air resistance could be maintained. The filter shows steadily high filtration efficiency and an acceptable increase of air resistance and holds nearly as many particles as its own weight in a 30 day long‐term test. The working mechanism of the EAA coarse filter is investigated, and the materials design criteria are proposed.

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Surface charge measurements on epoxy spacer in HVDC GIS/GIL in SF6

Cited by 27 publications

References 7 publications

Electrical Field Distribution along HVDC GIL Spacer in SF 6 /N 2 Gaseous Mixture

Electrical Field Distribution along HVDC GIL Spacer in SF 6 /N 2 Gaseous Mixture

Gas–solid interface charge characterisation techniques for HVDC GIS/GIL insulators

Ultralow Resistance Two‐Stage Electrostatically Assisted Air Filtration by Polydopamine Coated PET Coarse Filter

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