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For the real HVDC cable, because of the limitation of technical level and experimental conditions, the measurement of space charge distribution is a difficult problem. The suitable method may be Laser PWP method which use a powerful laser to generate a pressure wave. In this paper, space charge of planar sample, HVDC Cable on external layer and from inner conductor are respectively measured. All the...
The distribution of electric field in cable insulation under DC field is introduced, the non-uniform radial field and space charge accumulation lead to the distortion of electric field in cable insulation, so it is important to investigate the distribution of space charge in model cable insulation. It is indicated that the signal of space charge measurement is weak by pulsed electro-acoustic method...
The distribution of trap levels in the LLDPE (linear low density polyethylene) is studied by means of photo-stimulated discharge (PSD). And two scanning manners, continuous scanning and step scanning, are discussed. It is pointed out that there may be some problems because of the incomplete detrapping of the trapping charges for the continuous scanning. The principle and the experimental process for...
The method of the photo-stimulated discharge current (PSDC) for measuring trap energy levels in dielectrics has received considerable attention in the recent past. It is the optical equivalent of TSDC but much more powerful than TSDC. In this paper, the films of LLDPE are charged either with DC high voltage or in a point-to-plane corona discharge. The experimental results show the relationship between...
Though the space charge behavior of polyethylene under high DC or AC has been investigated and measured by many researchers, the results between different research groups have little comparability to each other. So itpsilas difficult to achieve a universal conclusion. A lot of experimental data and former research experiences we can acquire so far indicate that many factors affect space charge behavior...
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