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- W2511495389 abstract "This Paper describes the modified HDPE (into which a small amount of acid group is grafted as modified group) insulated cable as a high performance HVDC polymer cable. It has been confirmed that the high performance DC and impulse breakdown strength of modified HDPE results from the two aspects : (1) the improvement in intrinsic breakdown strength due to high crystallinity of HDPE, and (2) the restriction of space charges due to in- troducing the acid modified group. For instance, space charge distribution in modified HDPE cable(insulation thickness : t=3.5mm) measured by using pulsed electroacoustic(PEA) method shows a small amount of homo space charges near both electrodes under the DC field of sev- eral tens kV/mm. Also, DC and impulse breakdown strength of the modified HDPE cable (t= 12mm) exhibits the high level of 130 140kV/mm even in the temperature of 90 . In addition, because of the high crystallinity of base polymer (HDPE), the modified HDPE shows the smaller values of thermal resistivity and thermal expansion than conventional XLPE, which also serve as reduction of cable diameter for long-length DC cables. As for long-term DC characteristics, it has been proved that modified HDPE cable (t=3.5mm) endures DC 90kV/ mm 2,500hours at 90 . Moreover, over the range of maximum 10,000hours under the DC field of 30kV/mm, the changes in volume resistivity and space charge distribution(by PEA) of modified HDPE cable (t=6.0mm) have been verified. The insulation design applying above- mentioned properties can be achieved to give the insulation thickness below 20mm for 500kV class DC cables." @default.
- W2511495389 created "2016-09-16" @default.
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- W2511495389 date "2000-01-01" @default.
- W2511495389 modified "2023-09-27" @default.
- W2511495389 title "High Performance HVDC Polymer Cable" @default.
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