Method for evaluating insulation aging state of 10kV XLPE cable
An aging state, cable insulation technology
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[0046] The present invention will be described in further detail below.
[0047]The present invention takes 10kV XLPE AC cable insulation as the research object, and mainly includes the following steps: preparing slice samples of the cable insulation layer; performing thermal aging treatment on the cable slices at different preset temperatures to obtain XLPE insulation in different aging states Sample; use the fast ultra-low frequency dielectric loss detector (iFDS, Chongqing University) based on the identification theory to test the dielectric loss spectrum of the aging sample at a voltage of 200V and a frequency range of 0.001 to 100Hz; the measured data is in the logarithmic coordinate system Draw the dielectric loss-frequency curve; according to the variation trend characteristics of the dielectric loss value of different thermally aged samples with frequency on the dielectric loss-frequency curve, the frequency corresponding to the dielectric loss value reaching 0.5 is use...
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