Abstract
Recently, polypropylene (PP) is considered as the potential recyclable HVDC cable insulation material. Ethylene-based copolymer (EBC) and propylene-based copolymer (PBC) were introduced into PP to tailor the properties of PP and make it more capable for HVDC cable insulation application. This paper focused on the effects of two additions on those propertied such as microstructure, thermal properties, electrical properties and space charge accumulation of PP. The results indicated that PBC was uniformly dispersed in the matrix of PP without adhesion, and its particle size did not increase with the increase of its content in the matrix. With the increase of PBC, the glass transition peak of polypropylene decreased slowly, indicating a better performance on flexibility at low temperature. With the increase of content of copolymer, the DC volume resistivity of the composite material decreased gradually, but samples with PBC had higher resistivity than samples with EBC. In the term of space charge, the addition of PBC could help suppressing the accumulation of space charge better. To sum up, PP/PBC composite material could be an option for recyclable DC cable insulation material.
Highlights
Compared with AC transmission system, HVDC transmission technology has the advantages of unrestricted transmission distance, low loss, and interconnection between power grids with different frequencies, providing an effective solution for current and future power grid [1]–[3]
Offshore wind power has become an important strategic emerging industry, nor can this power be sent over overhead transmission lines
The development of DC cable is a feasible solution to the transmission channel problems of HVDC and offshore wind power
Summary
Compared with AC transmission system, HVDC transmission technology has the advantages of unrestricted transmission distance, low loss, and interconnection between power grids with different frequencies, providing an effective solution for current and future power grid [1]–[3]. The preparation method of PP/copolymer composites was studied, and the effects of EBC and PBC on the thermal properties, mechanical properties, dynamic thermal mechanical properties and electrical properties of polypropylene were compared. It is reported that adding copolymer contributes to improving the mechanical properties of polypropylene at room temperature, but may affect its melting point [18]–[21].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
