Analysis of Electric Field and Surface Discharge in Liquid-Solid Insulation System for HVDC Components

Moufakkir, Younes; Zouaghi, Ayyoub; Vollaire, Christian

doi:10.1109/icdl49583.2022.9830950

Cited by 1 publication

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, since the accumulated surface charges have the same polarity as the applied voltage, they induce a normal component of the electric field opposite to the total electric field that gets weakened in oil. The weakening of the initial electric field leads to a delay in the initiation of the streamer in the second case compared to the results in the first case [32]. Thus, the streamer inception voltage is increased in the second case.…”

Section: Study Of the Effect Of Surface Charge Accumulation On Stream...mentioning

confidence: 67%

“…Most simulation works focus on the study of streamers without considering the state of insulation beforehand where surface charge accumulates due to the application of a DC voltage. Therefore, in this work, which is a follow-up to our previous one [32], the discharge initiation and propagation in a liquid-solid insulation system under DC superimposed lightening impulse (LI) voltage condition is investigated numerically using finite element method (FEM) commercial software COMSOL Multiphysics ® . These simulations allow us to assess important quantities without implementing sophisticated experimental setups, and help define design rules for more reliable HVDC components.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints

2022

Self Cite

View full text Add to dashboard Cite

High-voltage direct current (HVDC) links are starting to become widely implemented thanks to their interesting advantages such as reduced operation losses, the absence of reactive power, which allows energy transport via underground cables over long distances, and improved power control. The latter advantage is very essential for renewable energy resource integration into power grids. However, a thorough understanding of the behavior of insulation systems for HVDC components is critical so as to ensure a more reliable service. Indeed, the existence of the direct current (DC) voltage in HVDC components may induce surface and space charge accumulation that can stress insulation further or even promote discharge inception and propagation. As such, this work focuses on showcasing the effect of surface charge on streamers that develop on the interface of liquid–solid insulation due to the advent of lightning impulse (LI) voltage in the HVDC link. This study was performed using finite-element-based numerical simulations that include a quasi-electrostatic model for surface charge accumulation and an electrohydrodynamic fluid model for streamer initiation and propagation. The geometry used was point–plane configuration where the high voltage is applied to the needle electrode located above the liquid–solid interface. The obtained results suggest that streamer initiation is affected by both the accumulated surface charge density and polarity. For a positive streamer, an accumulation of positive surface charge increases the discharge inception voltage as a result of a weakening in the electric field, while an accumulation of negative surface charge decreases the discharge inception voltage due to an intensification in the electric field. Moreover, streamer travel distance and velocity are also both shown to be affected by surface charge accumulation.

show abstract

Section: Study Of the Effect Of Surface Charge Accumulation On Stream...mentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints

2022

Self Cite

View full text Add to dashboard Cite

show abstract

Analysis of Electric Field and Surface Discharge in Liquid-Solid Insulation System for HVDC Components

Cited by 1 publication

References 7 publications

Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints

Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints

Contact Info

Product

Resources

About