Abstract
Current Saturation Due to Strong Field Concentration into Local Thin Area in Low-density Polyethylene Sheet under Stepwise Increasing DC Voltage
Highlights
DC power transmission technology has been introduced into conventional power transmission systems, and into smart grid systems for the most efficient use of natural energy sources, such as offshore wind power plants and mega-solar plants
It is clearly observed that the conduction current of additive-containing low-density polyethylene (LDPE) in Fig. 2(b) is much lower than that of additive-free LDPE in Fig. 2(c), these LDPE sheets are in contact with the SC electrode
The current-voltage characteristic for the additive-free LDPE with the Al(+)/Al(−) electrode under a low applied field cannot be explained by the space-charge-limited current (SCLC) model
Summary
DC power transmission technology has been introduced into conventional power transmission systems, and into smart grid systems for the most efficient use of natural energy sources, such as offshore wind power plants and mega-solar plants. These applications for efficient power transmission will become widely used. One of the key parts for improving the long-term reliability of DC power systems is an insulation layer for DC cables. The breakdown of the insulation layer subjected to very high electrical stress for a long period will cause serious lifeline damage.
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