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The surface flashover phenomena of insulating materials in vacuum greatly weakens the overall performance of vacuum-dielectric system. The improvement of surface flashover characteristics of insulators in vacuum becomes a significant challenge for the development of high voltage electrical equipment. In this paper, we propose a convenient avenue to achieve the high surface flashover performance of...
The surface flashover phenomena of insulating materials in vacuum greatly weakens the overall performance of vacuum-dielectric system, which seriously limits its development. The improvement of surface flashover characteristics of insulators in vacuum becomes a significant challenge for the development of high voltage electrical equipment. In this paper, we report a simple and convenient way to achieve...
Surface flashover phenomena in vacuum across dielectrics usually happen in many pulsed power devices, high power microwave (HPM) equipment and particle accelerators. Secondary electron emission avalanche (SEEA) model is generally accepted to analyze this phenomena. During the evolution of flashover development, the process of electrons desorption stimulated (ESD) gases plays a dominant role and then...
For dielectric-vacuum compound insulation systems, the discharges usually occur across the insulator surface with an onset voltage much lower than the breakdown voltage for vacuum gap of the same length. It is no wonder that the surface charge accumulated on the insulator plays an important role in the flashover process in vacuum, especially under DC voltage. In this paper, the off-line observation...
Excellent hydrophobicity and hydrophobicity migration property of silicone rubber material guarantee outstanding pollution resistance and insulation performance of composite insulators in outdoor insulation. Under effect of multiple environmental factors, insulators get aged with increase of service duration. In this paper, hydrophobicity recovery characteristics are revealed by static contact angle...
The surface flashover issue has always been a hot topic in the insulation field and it has been reported that various luminescent phenomena occur before flashover under a high electrical field in vacuum, which are closely related to the behavior of charge carriers induced by discharge. However, it is still not so clearly about the intrinsic relationship between the luminescence phenomenon and the...
Prior to flasshover across solid dielectrics under steady-state high voltage excitation in vacuum, there are charging phenomena occurring on insulator surface, which significantly affect the developing process of flashover. In this paper, based on the secondary electron emission avalanche model (SEEA) and Monte Carlo simulation method, the theoretical analysis of surface charge density on insulation...
The charge accumulation on the surface of dielectric materials is a long-term academic research focus. As part of an effort to understand the origins of this behavior, surface charge distribution on silicon rubber under DC high voltage before and after flashover in atmosphere was measured by an electrostatic voltmeter with a vibrating Kelvin probe. Three types of electrode systems were employed in...
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