Influence of SiC/Epoxy Coating on Surface Charging Phenomenon at DC Voltage - Part I: Charge Accumulation
Journal article, 2022

Surface charge accumulation on SiC/epoxy coatings with different contents of SiC filler, 3, 5, 7, 10 wt%, is investigated using flat samples of epoxy substrate. In the experiments, a pair of finger-shaped electrodes was attached to the samples surface using direct pressing and conductive adhesive providing two different types of contacts and, respectively, surface charging methods. The electrodes were energized by applying DC voltage for various time intervals and resulted surface charge distributions between the electrodes were measured. It was found that depending on the contact type, charging duration and filler content, different patterns of homo- or hetero-charge appeared on the material surface. Physical reasons for the observed effects are analyzed based on the calculated electric field distributions in the experimental setup, results of the auxiliary tests on material charging in a limited air volume and surface trap energy distributions measured utilizing the isothermal surface potential decay (ISPD) method. Application of SiC/epoxy coating for controlling surface charge accumulation is discussed.

Surface charging

charging method

Silicon carbide

surface trap

Surface charge accumulation

Coatings

Substrates

surface conductivity

Electrodes

HVDC

SiC/epoxy coatings

gas-insulated equipment

Surface treatment

Insulators

Author

Zijun Pan

Wuhan University

Cheng Pan

Wuhan University

Ju Tang

Wuhan University

Boli Hu

Wuhan University

Yi Luo

Wuhan University

Yuriy Serdyuk

Chalmers, Electrical Engineering, Electric Power Engineering

IEEE Transactions on Dielectrics and Electrical Insulation

1070-9878 (ISSN) 15584135 (eISSN)

Vol. 29 4 1333-1342

Areas of Advance

Energy

Subject Categories

Materials Chemistry

Other Chemistry Topics

Other Materials Engineering

DOI

10.1109/TDEI.2022.3183655

More information

Latest update

8/29/2022