Abstract
A conductive metallic particle in a gas-insulated metal-enclosed system can charge through conduction or induction and move between electrodes or on insulating surfaces, which may lead to breakdown and flashover. The charge on the metallic particle and the charging time vary depending on the spatial electric field intensity, the particle shape, and the electrode surface coating. The charged metallic particle can move between the electrodes under the influence of the spatial electric field, and it can discharge and become electrically conductive when colliding with the electrodes, thus changing its charge. This process and its factors are mainly affected by the coating condition of the colliding electrode. In addition, the interface characteristics affect the particle when it is near the insulator. The charge transition process also changes due to the electric field strength and the particle charging state. This paper explores the impact of the coating material on particle charging characteristics, movement, and discharge. Particle charging, movement, and charge transfer in DC, AC, and superimposed electric fields are summarized. Furthermore, the effects of conductive particles on discharge characteristics are compared between coated and bare electrodes. The reviewed studies demonstrate that the coating can effectively reduce particle charge and thus the probability of discharge. The presented research results can provide theoretical support and data for studying charge transfer theory and design optimization in a gas-insulated system.
Highlights
The importance of insulation breakdown and discharge caused by conductive particles in gas-insulated systems has attracted industrial attention
This paper reviews and summarizes the research progress of experimental work on faces are necessary to gain a better understanding of models, charge and transfer, which is valu the movement characteristics of conductive particles, associated the inhibitory information for coating designing high-voltage equipment optimizing withstand effect of electrode on surface particle charging
The coating material applied to the electrode and insulator influences particle charging characteristics, movement, and discharge
Summary
The importance of insulation breakdown and discharge caused by conductive particles in gas-insulated systems has attracted industrial attention. As the power level increases, the movement of metal particles becomes the main factor affecting the internal insulation of GIS/GILs. Figure 1 According to the statistics on gas-insulated system failures reported in China over the past decade [21], been extensively researched through modeling. According to statistics on gas-insulated system failures reported in China over the past decade particlesuppression suppression has become the primary towhen consider when the i particle has become the primary factor to factor consider designing thedesigning internal structure of gas-insulated equipment [3,4,5,6,7,8,9,10,11,12,13,14,15]
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