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Our previous studies showed that the aging parameter, i.e. the n-value, of XLPE was quite different from that of XLPE nanocomposites. In order to investigate the effects of space charge on aging parameter under DC voltage, the n-values of XLPE and its nanocomposites were measured under AC voltage in this report, because few space charge exits in the sample under AC voltage. Step-stress tests were...
The aging parameter n can reflect the aging property of material to some degree and determine the test voltage of the type test and prequalification test of HVDC cables. However, the aging parameter has rarely been studied systematically, especially under temperature gradient. In this paper, step-stress test was carried out to estimate the ageing parameter n of two materials, XLPE and its nanocomposites...
The effect of the introduction of nano-fillers into polyethylene on space charge accumulation is usually studied in electric fields reaching 100kV/mm using thin 100 μm samples, which is much thinner than the insulation in actual HVDC cables. Our previous work showed that space charge distributions in LDPE and its nanocomposites have different thickness dependences at isothermal temperature (20 °C...
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