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

Abstract

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.

Surface Charge Inversion Method on Cylindrical Insulators Based on Surface Potentials Measured Online

“…The upper and lower electrodes and the chamber are grounded. Equations (7) and (8) are solved to obtain the electric field distribution. The surface charge density σ is calculated by Gauss's theorem [24].…”

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“…The non-contact active electrostatic probe measurement method is presently the commonly widely used test technique [48] to measure the electric potential along the spacer's surface. This method determines the surface potential quantitatively based on the induction mechanism.…”

Promising functional graded materials for compact gaseous insulated switchgears/pipelines

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