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Polyethylene terephthalate (PET) has been used in a wide range of applications as insulating material in electrical equipment which possibly operate in radioactive environment such as nuclear power plant, spacecraft and scientific facilities. The PET used in such an environment is exposed to a great risk of high radiation induced ageing that gives rise to the deterioration of its insulation property...
XLPE films were employed as test samples to investigate the effect of cross-linking temperature on space charge decay behavior. The samples were cross-linked with temperature ranged from 150°C to 180°C in thickness of 200 μm. Corona charging method was employed to introduce charges on sample surface, after which open-circuit decay test was carried out at 35°C with relative humidity of ~ 45%. Surface...
Epoxy resin (ER) laminate was employed as sample to investigate the effects of gamma-ray irradiation on dynamic behavior of surface charge decay. Before the test, the samples were irradiated in air up to 100 kGy and then up to 1000 kGy with dosage rate of 10 kGy / h by using a 60Co gamma-source. The experiment was carried out at room temperature with relative humidity of ~ 50%. The sample surface...
Epoxy resin (EX) laminate was employed as test sample to investigate the effect of gamma-ray irradiation on dynamic behavior of surface charging and charge decay. Prior to the test, the samples were irradiated in air up to 100 kGy and then up to 1000 kGy with dosage rate of 10 kGy / h by using a 60Co gamma-source. The experiment was carried out at room temperature with relative humidity of ~ 50%....
Low density polyethylene (LDPE) laminate was employed as test sample to investigate effects of contact method on surface charging behavior. A couple of parallel aluminum plates that were directly pressed on sample surface made un-intimate contact pattern, while two copper foils that were attached on the surface made the intimate contact pattern. The voltage of -8 kV was applied between the electrodes...
Polymer insulating materials installed in electrical and electronic devices are widely used in spacecraft and nuclear power stations where the polymers are exposed to energetic radioactive rays. The chemical structure can be changed by radiation induced reactions that possibly gives rise to the alteration of characteristics of surface charge, which can enhance the local electrical field and cause...
Phenolic resin laminate (PL) was employed to investigate the effect of magnetic field on migration rate of surface carbonization which is the primary reason for surface dielectric breakdown. A needle-plate electrode system was used and the distance between the electrodes was 4 mm. Experiments were carried out under dc pulse voltage with a frequency rang from 50 Hz to 100 Hz. The magnetic flux density...
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