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A considerable amount of research work has been reported on charging phenomena of insulating surfaces. Most of these studies have been confined to either contact electrification of insulating surfaces and charge decay from insulating films [1], or corona behaviour of insulating materials [2]. All these studies seem to indicate that charging of insulating surfaces under dc voltages can pose a serious...
It is well known that the breakdown voltage in any insulation medium is considerably reduced in the presence of insulating surfaces parallel to the electric field. The mechanism of surface flashover in high vacuum has been investigated by many research workers,1, 8 and it is well known that under the applied voltage the insulator acquires a surface charge.2, 3, 7 The charge is positive if the maximum...
The experiments reported here again confirm the critical role of the electrode-insulator junctions in vacuum surface flashover phenomenon. From the experiments reported it is difficult to resolve the relative importance of any bulk space charge as compared to the surface charge. However, it is clear that under opposing dc and impulse stresses the insulator performance could be significantly impaired.
Any electrode system immersed in an insulating medium must invariably involve solid insulators in some part of the supporting structure. When an electric stress is applied to the electrodes, the solid dielectric fails by a surface flashover along the dielectric. At stresses much below the flashover stress, glows or incipient discharges occur. Optical observations of these early discharges in high...
In the last decade considerable research effort has been devoted to the exploitation of vacuum as an insulating medium. The impetus for this work has come mainly from the rapidly expanding technology of high power x-ray tubes, high energy particle accelerators and space exploration. Most of the research endeavour has been devoted to the study of breakdown across vacuum gaps under steady d.c. fields...
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