Experimental and Theoretical Study of Corona Inception Threshold in Rod to Plane Electrodes Under AC/DC Combined Voltage: Phase Corresponding to AC Voltage

Article Engineering, Electrical & Electronic

Separation and Classification of Corona Discharges Under Low Pressures Based on Deep Learning Method

Moein Borghei et al.

Summary: This study develops a DenseNet model based on experimental data to separate and classify various sources of corona discharge under low-pressure conditions, providing the foundation for a dielectric online condition monitoring system.

IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION (2022)

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Article Engineering, Electrical & Electronic

Experimental and numerical study on corona onset threshold under combined AC-DC voltages in Wire-Plane electrodes

Ziyu Ma et al.

Summary: This paper studied the phenomenon of corona discharge under combined AC-DC voltages, establishing an experimental platform and a new corona model to measure the variation of corona onset voltage. The results showed that conductor radius and spacing affected the corona onset curve, while residual space charges had a blocking effect on corona discharge, leading to higher corona onset voltages.

INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS (2022)

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Article Engineering, Electrical & Electronic

Experimental Study on Corona Onset Characteristics of Small Curvature Electrode Under Combined AC-DC Voltages

Ziyu Ma et al.

Summary: This research investigated the corona onset characteristics of small curvature electrodes with rough surfaces under combined ac-dc voltages. Experimental results showed that the corona inception voltage increased with the electrode fillet radius and electrode spacing, and the corona inception voltage of positive dc-ac was higher than that of negative dc-ac. The linear superposition of ac and dc voltages during corona onset was considered as the combined corona inception voltage.

IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION (2022)

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Article Engineering, Electrical & Electronic

Study on Corona Aging Characteristics of Silicone Rubber Material Under Different Environmental Conditions

Maoqiang Bi et al.

Summary: In this study, the corona aging characteristics of silicone rubber-based composite material were investigated under different environments using various testing methods. The results showed that the increase in humidity accelerated the aging process and surface damage of the material, while the corona discharge characteristics were different under haze environment. The findings provide valuable insights for the evaluation and production of composite insulators in different regions.

IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION (2022)

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Article Engineering, Electrical & Electronic

Space Charge Characteristics in Epoxy Resin Impregnated Paper under AC and AC-DC Superimposed Electric Fields

Siyu Zhang et al.

Summary: The charge distributions in three-layered epoxy resin and epoxy resin impregnated paper samples under AC and AC-DC superimposed electric fields were measured and analyzed in this study. A method to distinguish between different types of charges was proposed, and the influences of frequency, AC component, and DC component on the charge transport and trapping characteristics were obtained. These findings could provide important reference for the structural design and optimization of converter transformer bushings.

IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION (2021)

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Article Computer Science, Information Systems

The Role of Space Charge on Corona Inception Threshold Conditions in Rod-Plane Air Gaps at DC/AC Combined Voltages

Xuyuan He et al.

Summary: The study found that in high AC component, the corona inception voltage is higher for negative corona compared to positive corona, while in low AC component, the corona inception voltage is higher for positive corona. The corona inception voltage decreases with increasing AC component, and the remaining space charge tends to block corona inception, leading to a higher corona inception voltage.

IEEE ACCESS (2021)

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Article Engineering, Electrical & Electronic