Abstract
High voltage direct current (HVDC) power transmission plays a key role in the global power grid today and in the future, particularly for high-capacity, long-distance, and regional power grid interconnections. With the high voltage level of the HVDC power system, the most important concern is the operating safety of polymeric materials as well as solutions for HVDC insulation. During polarity reversal and overvoltages on the HVDC system, polymeric insulation can breakdown in cables, cable accessories, apparatus bushings and gas insulated switchgears. The issues regarding polymeric materials which includes the DC conductivity, charge transportation and partial discharge, have become key problems in restraining the development of the HVDC power system.
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