| The surface flashover of solid insulating material in vacuum is an important factor for restricting the high performance and miniaturization of high voltage electrical equipment.With the rapid development of high voltage equipment,the requirement of vacuum solid insulation technology is increasing day by day.The insulation technology of micro-stacked insulators is a new type of insulation technology produced with the development of new type of accelerator.In this paper,under the condition of 2mm fixed electrode gap,a series of studies were carried out on the preparation technology of micro-stacked insulators,surface treatment technology,proportion of insulation layer and conductive layer,the proportion of embedded microgap in the total and flashover arc of micro-stacked insulators,to explore the factors affecting flashover performance of micro-stacked insulators.Combined with 3D printing technology,the preparation of micro-stacked insulators was preliminarily studied.First,an experimental platform was built for vacuum surface flashover and the preparation of micro-stacked insulators samples.Using nylon as the insulating layer,copper powder conductive adhesive and conductive silver adhesive instead of conductive layer micro-stacked insulators were prepared.The factors influencing flashover performance of micro-stacked insulators were analyzed by combining surface morphology,polishing mode and electric field structure.Secondly,the conductive silver adhesive was used as the conductive layer to prepare the micro-stacked insulators with different proportion relationships and the proportion of embedded microgap in the total.It is found that the flashover performance of insulators increases with the increase of I/M ratio when the number of conductive layers is the same.However,the proportional relationship is not the only factor that determines the insulator performance.When the number of conductive layers is different,the insulator performance of low I/M may be higher than that of high I/M ratio.As the proportion of embedded micro gap increases,the flashover performance increases firstly and decreases then.The optimal proportion of embedded microgap is 0.61 at 2mm electrode gap.The full exposure process of the flashover discharge channels of the micro-stacked insulators and conventional insulators was photographed by camera.The discharge of the micro-stacked insulators is breakdown step by step.Combined with Maxwell electric field simulation,the distribution of microgap electric field and flashover mechanism of micro-stacked insulators were analyzed.Finally,combined with 3D printing technology,the preparation of micro-stacked insulators is preliminarily attempted.The flashover property,the aging property of continuous discharge,the changes of arc and spectrum in the aging process of photosensitive resin which is a common material for 3D printing were studied The preliminary design and experimental study of the preparation of micro-stacked insulators were carried out by using 3D printing technology.The research results can provide reference for the preparation of micro-stacked insulators by 3D printing technology... |
