Abstract
Demand and need for the application of high voltage direct current (HVDC) are increasing because of high capacity and long-distance transmission. Research on polypropylene (PP) that can increase the operation temperature compared to existing insulation is constantly being considered. This study aimed to evaluate the electrical performance and estimate the life of HVDC application of PP. In this study, a DC V-t characteristic tests were conducted on three types of PP sheets at a temperature of 110 °C. In addition, a life estimation formula based on the electrical stress was derived and the electrical performances were evaluated. The experimental results show that the life exponent of material mixed with block copolymer, homo polymer and high density polyethylene (HDPE) was 23 and the electrical performance was 17% better than block copolymer, thereby demonstrating the reliability and electrical performance for application of HVDC.
Highlights
Demand for high voltage direct current (HVDC) is increasing due to higher voltage of power cables and long-distance transmission
In order to determine the approximate test voltage of the V-t characteristic test, a ramping test was performed on three types of PPs, and the Weibull distribution 63.2% of breakdown data was 40 kV or more
Electrical performance was evaluated for HVDC application of PP
Summary
Demand for high voltage direct current (HVDC) is increasing due to higher voltage of power cables and long-distance transmission. The insulations for HVDC uses mass oil, which has recently been converted to polymers due to environmental, production, and transmission capacity issues [1,2,3]. Polypropylene (PP) has an operating temperature of 110 ◦ C, has a higher transmission capacity than existing mass impregnated (MI), oil filled (OF) and cross linked polyethylene (XLPE), and can be recycled. The design life of HVDC MI, OF and XLPE power cables is 30 to 40 years. Since HVDC cables are operated underground or on the seabed for a long period of time, the evaluation of life and long-term reliability is considered as an important factor for the development of DC insulating materials [6,7]
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