Effects of ac voltage on charge density in a spacer

Elkhodary, Salem M.; Hackam, R.

doi:10.1109/ceidp.1995.483772

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Experimental data reported in [20] on the application of realistic ac electrical gradients to an indating specimen verify the previous assumption. Voltage application of ac resulted in surface charge build-up.…”

Section: Discussionsupporting

confidence: 69%

AC and DC performance of polymeric housing materials for HV outdoor insulators

Moreno

Gorur

1999

IEEE Trans. Dielect. Electr. Insul.

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An experimental study was conducted to investigate the performance of several polymer outdoor insulator formulations under ac and dc electrical stresses, The performance of the polymers was evaluated in terms of their charge accumulation and decay characteristics as a function of humidity, and their tracking and erosion resistance. The results obtained from this study indicate that significant differences exist in surface charging phenomena between ac and dc.A likely contribution of dc polarization processes leading to hydrophobicity loss is believed to influence additionally the performance of materials subjected to pollution and dc electrical stresses. A substantial reduction in the tracking and erosion resistance of the polymeric materials is observed with dc stresses, in comparison to ac. The poorer electrical performance of the materials stressed with dc voltage was found to be due to higher magnitudes and longer duration times of the discharge current.

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Section: Discussionsupporting

confidence: 69%

AC and DC performance of polymeric housing materials for HV outdoor insulators

Moreno

Gorur

1999

IEEE Trans. Dielect. Electr. Insul.

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“…He found that charge accumulation under the AC stress is favourably of the negative polarity with lower amplitude compared with the case measured under DC application. Studies of Elkhodary and Hackam [13] suggest that positive and negative charges maybe neutralised repeatedly during the positive and negative half waves of AC voltage. Owing to the polarity effect of micro‐discharge, and the higher mobility of electron than that of ion, negative charges take a priority on the insulator surface.…”

Section: Introductionmentioning

confidence: 99%

Charge accumulation characteristic on polymer insulator surface under AC voltage in air and C ₄ F ₇ N/CO ₂ mixtures

Zhang

Wang

et al. 2020

High Voltage

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Charge accumulation has always been a problem for the safe operation of gas insulated switchgear (GIS)/gas insulated transmission line (GIL) both under AC and DC. It is of great significance to investigate the behaviour of surface charge under high voltage. In this study, the charge distribution characteristics and accumulation mechanism on insulator surface in air and heptafluorobutyronitrile/carbon dioxide (C 4 F 7 N/CO 2) mixtures under AC voltage are studied via the means of surface potential measurement and inversion algorithm, combined with the improved method of controlling the truncated phase of AC voltage. The results show that under the needle-plate electrode structure, charge distribution on the insulator surface presents a three-tier concentric circle structure both in air and C 4 F 7 N/CO 2 gas mixtures, and the charge composition of the innermost circle is closely related to the truncated phase of AC voltage. Under the same amplitude of voltage, the range of charge distribution on insulator surface in C 4 F 7 N/CO 2 mixtures is smaller than that in air, with the negative charges domination. It is suggested that the characteristic of charge distribution in C 4 F 7 N/CO 2 mixtures is related to the larger electron attachment crosssection of C 4 F 7 N gas in a wide range of electron energy distribution.

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Surface charge Accumulation on Epoxy Insulator with Metal Particle in C₄F₇N/CO₂ under AC voltage

Gao

et al. 2023

2023 IEEE 4th International Conference on Electrical Materials and Power Equipment (ICEMPE)

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Effects of ac voltage on charge density in a spacer

Cited by 4 publications

References 5 publications

AC and DC performance of polymeric housing materials for HV outdoor insulators

AC and DC performance of polymeric housing materials for HV outdoor insulators

Charge accumulation characteristic on polymer insulator surface under AC voltage in air and C ₄ F ₇ N/CO ₂ mixtures

Surface charge Accumulation on Epoxy Insulator with Metal Particle in C₄F₇N/CO₂ under AC voltage

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Effects of ac voltage on charge density in a spacer

Cited by 4 publications

References 5 publications

AC and DC performance of polymeric housing materials for HV outdoor insulators

AC and DC performance of polymeric housing materials for HV outdoor insulators

Charge accumulation characteristic on polymer insulator surface under AC voltage in air and C 4 F 7 N/CO 2 mixtures

Surface charge Accumulation on Epoxy Insulator with Metal Particle in C4F7N/CO2 under AC voltage

Contact Info

Product

Resources

About

Charge accumulation characteristic on polymer insulator surface under AC voltage in air and C ₄ F ₇ N/CO ₂ mixtures

Surface charge Accumulation on Epoxy Insulator with Metal Particle in C₄F₇N/CO₂ under AC voltage