Effects of surface conductivity on surface charging behavior of DC-GIL spacers

Chen, Junhong; Xue, Jie; Dong, Junhao; Li, Yuan; Deng, Jian; Zhang, Guanjun

doi:10.1109/tdei.2020.008707

Cited by 26 publications

(36 citation statements)

References 23 publications

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“…The time for the charge density to achieve the stationary state is reduced by about 80% at this point. According to (13), charge accumulation is defined by the bulk conduction, the gas conduction and the surface conduction. Thus, any disturbance to the three terms would affect the charge accumulation characteristics.…”

Section: B Influence Of Thermal Gradient On the Transient Surface Cha...mentioning

confidence: 99%

“…On the other hand, large current flows through the central conductor, and the thermal gradient would be established inside the pipe due to Joule heat [11]. Meanwhile, it was found that the electric conductivity of the insulator would affect the surface charge distribution characteristics [12], [13]. Thus, this thermal gradient should be involved when dealing with the electric field property of the insulator under DC stress considering the temperature-dependent electric conductivity of the insulator [14].…”

Section: Introductionmentioning

confidence: 99%

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Transient Surface Charge Characteristics of DC-GIL Insulator Under Thermal-Electric Coupled Fields

Han

Wan

et al. 2022

IEEE Access

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The insulator in direct current gas-insulated transmission lines (DC-GIL) would suffer discharge risk due to surface charge accumulation under thermal-electric coupled fields. In this paper, the transient surface charge accumulation characteristics of a basin-type DC-GIL insulator is investigated via finite element method based on a three-dimension horizontally installed GIL model. The stationary temperature distribution of the model is obtained and then applied to the transient simulation of charge. Weak form partial differential equation is employed to deal with the ion transportation equation. Equations and parameters in the simulation are optimized to reduce the computing memory and time. Results indicate that the charge accumulation is accelerated due to the promotion of conduction through the insulator under thermal gradient. Higher charge density is obtained under thermal gradient. And the surface charge density of the convex surface is higher due to the promoted conduction. The highest field strength increases and the corresponding location moves along the convex surface during the transient process. This could attribute to the influence of transient charge behavior under thermal gradient on the electric field distribution. This study indicates that the thermal gradient and transient charge accumulation should be considered when dealing with the insulation characteristics of DC-GIL with insulators.INDEX TERMS Gas insulated transmission lines, insulator, surface charge, thermal-electric coupled fields.

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Section: B Influence Of Thermal Gradient On the Transient Surface Cha...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient Surface Charge Characteristics of DC-GIL Insulator Under Thermal-Electric Coupled Fields

Han

Wan

et al. 2022

IEEE Access

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“…By substituting (5) into (7), the ion transport equation was obtained in (8) for positive and negative, respectively.…”

Section: Charge Accumulation Mechanismmentioning

confidence: 99%

Transient surface charge of SF ₆ ‐filled direct current gas‐insulated transmission lines insulator under thermal‐electric coupled fields: effects of ambient temperature, load current and gas pressure

Han

Wang

et al. 2022

IET Generation Trans & Dist

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The transient surface charge characteristics of a basin-type insulator in horizontally installed SF 6 -filled direct current gas-insulated transmission lines (DC-GIL) are investigated based on a three-dimension (3D) simulation model under thermal-electric coupled stress. The influence of ambient temperature, load current and gas pressure on the surface charge and electric field characteristics is investigated. Simulation results indicate that the surface charge accumulation process is accelerated due to the promotion of bulk conduction under high ambient temperature, high load current and low gas pressure. The transient field variation is accelerated as the consequence. The highest field strength on the convex surface increases and moves towards the enclosure with increasing time. With increasing load current, the field strength increases due to the influence of charge accumulation and temperature-dependent conductivity of the insulator. It is revealed that the transient surface charge under coupled fields should be focused when dealing with the insulation characteristics of DC-GIL insulators during long-term operation. The mentioned operating conditions should be paid attention. This method introduced in this study can help to evaluate the 3D transient charge and field characteristics under various conditions.

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“…Conductivity was used to describe how easy it is for the charge in the substance to flow . In this study, the conductivities of liposome solutions reflected their amount of surface charge from the indirect perspective.…”

Section: Results and Discussionmentioning

confidence: 99%

Novel Peptide–Polymer Conjugate with pH-Responsive Targeting/Disrupting Effects on Biomembranes

Wang

Sun

et al. 2021

Langmuir

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Conjugating polymers to peptides has become a new strategy of designing functional antitumor agents for their improved stability and enhanced activity. In this paper, a novel peptide− polymer conjugate PEPc−PMAA with pH responsiveness was designed and synthesized. The isoelectric point of PEPc was studied by dynamic light scattering for the targeting effect. Also, the transmittances of PMAA at different pHs were measured using an ultraviolet−visible spectrophotometer for determining the triggering pH of the disrupting effect. The results showed that PEPc−PMAA was hydrophilic under neutral conditions and changed to be amphiphilic composed of positively charged PEPc and hydrophobic PMAA under acidic conditions. The interactions between PEPc− PMAA and mimic cells were investigated by the measurements of membrane fluidity and cargo leakage from 1,2-dipalmitoyl-snglycerol-3-phosphocholine and 1,2-dipalmitoyl-sn-glycerol-3-phospho-(1-rac-glycerol) (DPPG) liposomes. It proved that PEPc− PMAA caused a distinct membrane disturbance of the DPPG liposome at pH 5.5, resulting in more serious cargo leakage. Because of its targeting and disrupting effects on negatively charged biomembranes under acidic conditions, PEPc−PMAA showed its good potential as an antitumor agent.

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Effects of surface conductivity on surface charging behavior of DC-GIL spacers

Cited by 26 publications

References 23 publications

Transient Surface Charge Characteristics of DC-GIL Insulator Under Thermal-Electric Coupled Fields

Transient Surface Charge Characteristics of DC-GIL Insulator Under Thermal-Electric Coupled Fields

Transient surface charge of SF ₆ ‐filled direct current gas‐insulated transmission lines insulator under thermal‐electric coupled fields: effects of ambient temperature, load current and gas pressure

Novel Peptide–Polymer Conjugate with pH-Responsive Targeting/Disrupting Effects on Biomembranes

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Effects of surface conductivity on surface charging behavior of DC-GIL spacers

Cited by 26 publications

References 23 publications

Transient Surface Charge Characteristics of DC-GIL Insulator Under Thermal-Electric Coupled Fields

Transient Surface Charge Characteristics of DC-GIL Insulator Under Thermal-Electric Coupled Fields

Transient surface charge of SF 6 ‐filled direct current gas‐insulated transmission lines insulator under thermal‐electric coupled fields: effects of ambient temperature, load current and gas pressure

Novel Peptide–Polymer Conjugate with pH-Responsive Targeting/Disrupting Effects on Biomembranes

Contact Info

Product

Resources

About

Transient surface charge of SF ₆ ‐filled direct current gas‐insulated transmission lines insulator under thermal‐electric coupled fields: effects of ambient temperature, load current and gas pressure