Abstract

Space charge characteristics of cross-linked polyethylene (XLPE) at elevated temperatures have been evidently improved by the graft modifications with ultraviolet (UV) initiation technique, which can be efficiently utilized in industrial cable manufactures. Maleic anhydride (MAH) of representative cyclic anhydride has been successfully grafted onto polyethylene molecules through UV irradiation process. Thermal stimulation currents and space charge characteristics at the elevated temperatures are coordinately analyzed to elucidate the trapping behavior of blocking charge injection and impeding carrier transport which is caused by grafting MAH. It is also verified from the first-principles calculations that the bound states as charge carrier traps can be introduced by grafting MAH onto polyethylene molecules. Compared with pure XLPE, the remarkably suppressed space charge accumulations at high temperatures have been achieved in XLPE-g-MAH. The polar groups on the grafted MAH can provide deep traps in XLPE-g-MAH, which will increase charge injection barrier by forming a charged layer of Coulomb-potential screening near electrodes and simultaneously reduce the electrical mobility of charge carriers by trap-carrier scattering, resulting in an appreciable suppression of space charge accumulations inside material. The exact consistence of experimental results with the quantum mechanics calculations demonstrates a promising routine for the modification strategy of grafting polar molecules with UV initiation technique in the development of high-voltage DC cable materials.

Highlights

  • With the considerable promotion of developing novel energy in recent years, the clean and renewable electric power generation has become the innovation focus for future power systems [1].it is generally poor in economics and environmental protection that these new decentralized and miniaturized power sources far from the power center, such as solar or wind energy generation, are connected into the power grid by exploiting alternating current (AC) transmission technology.Nowadays, high-voltage direct current (HVDC) transmission technology based on voltage source converter (VSC) has been gradually improved to be capable of fulfilling long distance and large capacity power transmissions [2]

  • Space charge characteristics of XLPE dielectrics at elevated temperatures have been significantly improved by utilizing UV initiation technique in Maleic anhydride (MAH) grafting process, the underlying modification mechanisms of which are systemically investigated by TSC analyses in combination with quantum mechanics calculations

  • XLPE-g-MAH materials with almost zero gel content have been synthesized through the successful UV initiated reactions of grafting MAH onto polyethylene molecules, which has been verified by the gel extraction experiments and IR spectroscopic characterizations

Read more

Summary

Introduction

With the considerable promotion of developing novel energy in recent years, the clean and renewable electric power generation has become the innovation focus for future power systems [1].it is generally poor in economics and environmental protection that these new decentralized and miniaturized power sources far from the power center, such as solar or wind energy generation, are connected into the power grid by exploiting alternating current (AC) transmission technology.Nowadays, high-voltage direct current (HVDC) transmission technology based on voltage source converter (VSC) has been gradually improved to be capable of fulfilling long distance and large capacity power transmissions [2]. With the considerable promotion of developing novel energy in recent years, the clean and renewable electric power generation has become the innovation focus for future power systems [1]. It is generally poor in economics and environmental protection that these new decentralized and miniaturized power sources far from the power center, such as solar or wind energy generation, are connected into the power grid by exploiting alternating current (AC) transmission technology. As one of the key equipment to construct DC power grid, cross-linked polyethylene (XLPE) insulated cable is required for higher insulation performances in order to ensure the security and stability of power transmission system [3,4,5]. It is urgent to study the modified polyethylene materials with thermostable dielectric performances

Methods
Results
Conclusion
Full Text
Paper version not known

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 call

Disclaimer: 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.