Numerical simulation on the surface charge accumulation process of epoxy insulator under needle‐plane corona discharge in air. Issue 1 (1st January 2018)

• Record Type: Journal Article
• Authors: Liang, Hucheng; Du, Boxue; Li, Jin; Du, Qiang
• Is Part Of: IET science, measurement & technology. Volume 12:Issue 1(2018)
• Page Start: 9
• Page End: 16
• Publication Date: 2018-01-01
• Subjects: power apparatus -- corona -- hydrodynamics -- gaseous insulation; surface charge accumulation process -- epoxy insulator -- needle‐plane corona discharge -- HV power equipment -- plasma hydrodynamics -- charge trapping–detrapping process -- simulation model -- corona discharge intensity; Measurement -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Periodicals; Nanotechnology -- Periodicals; Electromagnetism -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3
• DOI: 10.1049/iet-smt.2017.0164
• Languages: English
• ISSNs: 1751-8822

Abstract

Abstract : Most of the HV power equipment with gas–solid insulation suffers a lot from the surface charge accumulation due to corona discharge. The existence of surface charge distorts the local electric field and leads to surface flashover faults in extreme situations. As a result, it is important to figure out the mechanism of surface charge accumulation process. In this study, a simulation model combining both the plasma hydrodynamics and charge trapping–detrapping process was built. The simulation results have a good agreement with the experimental data, the main summary is as follows: in the surface charge accumulation process, the corona discharge intensity increases first and then decreases with time. The curves of the surface potential distributions have different shapes at different times, the central value goes up rapidly with time in the beginning and finally reaches saturation. Surface charges exist in the skin layer of epoxy insulator, some of them may be captured by traps while transporting away under built‐in electric field.