Electric field simulations of high voltage DC extruded cable systems

Mauseth, Frank; Haugdal, Hallvar

doi:10.1109/mei.2017.7956628

Cited by 28 publications

(20 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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 ]. 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 ]. In spite of high operating temperature, light weight and easy to manufacture, XLPE-insulated HVDC cable is susceptible to the charge injection and space charge accumulation under HVDC electric field, which will lead to electric field distortion, insulation aging, and even to dielectric breakdown.…”

Section: Introductionmentioning

confidence: 99%

Elevated-Temperature Space Charge Characteristics and Trapping Mechanism of Cross-Linked Polyethylene Modified by UV-Initiated Grafting MAH

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Elevated-Temperature Space Charge Characteristics and Trapping Mechanism of Cross-Linked Polyethylene Modified by UV-Initiated Grafting MAH

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The mass ratio of the silicone rubber and nano-SiO 2 was 20:1. -The silicone rubber and nano-SiO 2 were mixed for 45 min in a two-roll mill according to the ratio [13] under the room temperature. -After the two kinds of raw materials were mixed evenly, the crosslinking agent (2%) was added, and the mixture was mixed again at room temperature for 5 min.…”

Section: Preparation Of Non-linear Insulating Materials Based On Silicone Rubbermentioning

confidence: 99%

Research on the electric field intensity distribution of high-voltage cable terminal improved by non-linear material

Li¹,

Wang²,

Xu³

2021

Manufacturing Rev.

View full text Add to dashboard Cite

The electric field distortion caused by the high voltage current environment in the cable terminal will greatly increase the failure probability and reduce the operation safety; therefore, it is necessary to ensure the uniform distribution of the electric field in the terminal. This paper briefly introduced the high-voltage cable terminal and non-linear materials. The traditional silicone rubber and the silicone rubber added with nano-SiO2 were prepared. The electrical conductivity of the two silicone rubbers was tested, and the electric field of the cable terminal was simulated. The results demonstrated that the nano-SiO2 improved silicone rubber had a higher non-linear conductivity and was less affected by temperature. The calculation results of the simulation model also showed that the distribution of the internal field strength was more uniform, and the maximum field strength on the reinforced insulation was smaller after the improved silicone rubber was used as the reinforced insulation.

show abstract

“…At present, high voltage direct current (HVDC) transmission technology on account of voltage source converters (VSCs) has been significantly developed to realize power transmission of large capacity over long distances [2]. As the pivotal equipment to constitute DC power grid, crosslinked polyethylene (XLPE) insulated cables with higher insulation performances are obligatory to guarantee secure and stable operation of a power transmission system [3][4][5]. Despite the high operating temperature, light weight and ease of manufacturing, XLPE insulated HVDC cable is susceptible to charge injection and space charge accumulation under an HVDC electric field, which eventually results in insulation aging and dielectric breakdown caused by electric field distortion.…”

Section: Introductionmentioning

confidence: 99%

Significantly Improved Electrical Properties of Crosslinked Polyethylene Modified by UV-Initiated Grafting MAH

Zhao

Sun

2020

Polymers

View full text Add to dashboard Cite

Direct current (DC) electrical performances of crosslinked polyethylene (XLPE) have been evidently improved by developing graft modification technique with ultraviolet (UV) photon-initiation. Maleic anhydride (MAH) molecules with characteristic cyclic anhydride were successfully grafted to polyethylene molecules under UV irradiation, which can be efficiently realized in industrial cable production. The complying laws of electrical current varying with electric field and the Weibull statistics of dielectric breakdown strength at altered temperature for cable operation were analyzed to study the underlying mechanism of improving electrical insulation performances. Compared with pure XLPE, the appreciably decreased electrical conductivity and enhanced breakdown strength were achieved in XLPE-graft-MAH. The critical electric fields of the electrical conduction altering from ohm conductance to trap-limited mechanism significantly decrease with the increased testing temperature, which, however, can be remarkably raised by grafting MAH. At elevated temperatures, the dominant carrier transport mechanism of pure XLPE alters from Poole–Frenkel effect to Schottky injection, while and XLPE-graft-MAH materials persist in the electrical conductance dominated by Poole–Frenkel effect. The polar group of grafted MAH renders deep traps for charge carriers in XLPE-graft-MAH, and accordingly elevate the charge injection barrier and reduce charge mobility, resulting in the suppression of DC electrical conductance and the remarkable amelioration of insulation strength. The well agreement of experimental results with the quantum mechanics calculations suggests a prospective strategy of UV initiation for polar-molecule-grafting modification in the development of high-voltage DC cable materials.

show abstract

Electric field simulations of high voltage DC extruded cable systems

Cited by 28 publications

References 5 publications

Elevated-Temperature Space Charge Characteristics and Trapping Mechanism of Cross-Linked Polyethylene Modified by UV-Initiated Grafting MAH

Elevated-Temperature Space Charge Characteristics and Trapping Mechanism of Cross-Linked Polyethylene Modified by UV-Initiated Grafting MAH

Research on the electric field intensity distribution of high-voltage cable terminal improved by non-linear material

Significantly Improved Electrical Properties of Crosslinked Polyethylene Modified by UV-Initiated Grafting MAH

Contact Info

Product

Resources

About