Abstract
The air’s partial discharges (PD) under DC voltage are obviously affected by space charges. Discharge pulse parameters have statistical regularity, which can be applied to analyze the space charge effects and discharge characteristics during the discharge process. Paper studies air corona discharge under DC voltage with needle-plate model. Statistical rules of repetition rate (n), amplitude (V) and interval time (∆t) are extracted, and corresponding space charge effects and electric field distributions in PD process are analyzed. The discharge stages of corona discharge under DC voltage are divided. Furthermore, reflected space charge effects, electric field distributions and discharge characteristics of each stages are summarized to better explain the stage discharge mechanism. This research verifies that microcosmic process of PD under DC voltage can be described based on statistical method. It contributes to the microcosmic illustration of gas PD with space charges.
Highlights
Nowadays, the insulation requirements of DC equipment are further improved, with the wide application of DC system in high voltage direct current (HVDC) transmission and other aspects.As a reflection of insulation faults in DC system, PD under DC is concerned in many researches.Gas partial discharge (PD) under DC voltage is a process closely related to the generation, migration and dissipation of space charges
The recovery time of electric field is related to the dissipation of space charges, which is influenced by q of the retained space charges and E of the space after a streamer
The statistical rules of characteristic parameters of each stage and transition process are explained by the space charge effects and electric field distributions
Summary
The insulation requirements of DC equipment are further improved, with the wide application of DC system in high voltage direct current (HVDC) transmission and other aspects. Due to the lack of space charge measurement methods in gas, it is difficult to describe the space charge and the electric field distributions through testing. Some researches apply simulation methods to describe the discharge mechanism [16,17]. Energies 2019, 12, 2732 applying corona discharge fluid model, space charge intensity and electric field variation during a single discharge process are described. The simulation starts with none space charge situation and discharge fluid spaceofcharge and electric field during aspace single discharge only lasts for themodel, short time a singleintensity discharge, which does notvariation take the retained charges into process are described. Space [19] describes corona layer morphology by gray and thickness on the into luminescent charge distribution are studied in some experimental methods [18,19]
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