Development of 500-kV XLPE cables and accessories for long-distance underground transmission lines. IV. Electrical properties of 500-kV extrusion molded joints

Takeda, Naokazu; Izumi, Satoshi; Asari, K. Vijayan; Nakatani, Alan I.; Noda, Hideyuki; Yamaguchi, Masayuki; Tan, M.

doi:10.1109/61.489316

Cited by 14 publications

(3 citation statements)

References 3 publications

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“…Power cable accessories are important part of the cable system [1] . It is found that the failure rate of cable accessories is much higher than that of cable body.…”

Section: Introductionmentioning

confidence: 99%

MgO nanoparticles on the electrical properties of insulating materials for high voltage cable system

Qiao,

Yan,

et al. 2024

Fifth International Conference on Optoelectronic Science and Materials (ICOSM 2023)

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The present paper reports about the effect of nano-filler on the performance of insulating materials in high voltage cable system applications. The influence of the processing method and content of nano-filler was studied. It was demonstrated that the choice of the right processing method is crucial for obtaining end products with desired properties, because of better filler dispersion. Composites with MgO nanofiller modified by in-situ modification and dispersion by high-speed stirring has better mechanical and electrical performance for cable system.

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“…Power cable accessories are important part of the cable system [1] . It is found that the failure rate of cable accessories is much higher than that of cable body.…”

Section: Introductionmentioning

confidence: 99%

MgO nanoparticles on the electrical properties of insulating materials for high voltage cable system

Qiao,

Yan,

et al. 2024

Fifth International Conference on Optoelectronic Science and Materials (ICOSM 2023)

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“…Polymer dielectric composites for filling inorganic nanoparticles into low-density polyethylene (LDPE) can acquire a significant improvement in the dielectric performances of polyethylene insulation materials by inhibiting space charge accumulations and charge injections [ 10 , 11 , 12 , 13 , 14 ]. For Al 2 O 3 /LDPE nanocomposites, the internal space charge quantity is highly correlated with the nanofiller concentration, which approaches the minimum level at a filling content of 1.0 wt%, implying the optimal balance point of suppressing space charge accumulations with the nanofiller concentration [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Dielectric Characteristics of Crosslinked Polyethylene Modified by Grafting Polar-Group Molecules

2023

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Polar group-modified crosslinked polyethylene (XLPE) materials are developed with a peroxide thermochemical method of individually grafting chloroacetic acid allyl ester (CAAE) and maleic anhydride (MAH) to polyethylene molecular-chains, which are dedicated to ameliorating dielectric characteristics through charge-trapping mechanism. By free radical addition reactions, the CAAE and MAH molecules are successfully grafted to polyethylene molecular chains of XLPE in crosslinking process, as verified by infrared spectroscopy molecular characterizations. Dielectric spectra, electric conductance, and dielectric breakdown strength are tested to evaluate the improved dielectric performances. Charge trap characteristics are investigated by analyzing thermal stimulation depolarization currents in combination with first-principles electronic-structure calculations to reveal the polar-group introduced mechanisms of contributing dipole dielectric polarization, impeding electric conduction, and promoting electrical breakdown field. The grafted polar-group molecules, especially for MAH, can introduce deep-level charge traps in XLPE materials to effectively restrict charge injections and hinder charge carrier transports, which accounts for the significant improvements in electric resistance and dielectric breakdown strength.

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“…The defects in the cable joint are the main cause of explosion accidents. Many studies have been conducted to investigate the electric field distribution and aging process of main cable body, whereas studies of the cable joint are inadequate due to its complicated structure and multiple installation procedures [9,10]. This paper focuses on the electric field analysis around the 10 kV cable joint to determine the characteristics of the field distribution corresponding to each typical defect.…”

Section: Introductionmentioning

confidence: 99%

Charge-Simulation-Based Electric Field Analysis and Electrical Tree Propagation Model with Defects in 10 kV XLPE Cable Joint

Cui

2019

Energies

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The most severe partial discharges and main insulation failures of 10 kV cross-linked polyethylene cables occur at the joint due to defects caused by various factors during the manufacturing and installation processes. The electric field distortion is analyzed as the indicator by the charge simulation method to identify four typical defects (air void, water film, metal debris, and metal needle). This charge simulation method is combined with random walk theory to describe the stochastic process of electrical tree growth around the defects with an analysis of the charge accumulation process. The results illustrate that the electrical trees around the metal debris and needle are more likely to approach the cable core and cause main insulation failure compared with other types of the defects because the vertical field vector to the cable core is significantly larger than the field vectors to other directions during the tree propagation process with conductive defects. The electric field was measured around the cable joint surface and compared with the simulation results to validate the calculation model and the measurement method. The air void and water film defects are difficult to detect when their sizes are less than 5 mm3 because the field distortions caused by the air void and water film are relatively small and might be concealed by interference. The proposed electric field analysis focuses on the electric field distortion in the cable joint, which is the original cause of the insulation material breakdown. This method identifies the defect and predicts the electrical tree growth in the cable joint simultaneously. It requires no directly attached or embedded sensors to impact the cable joint structure and maintains the power transmission during the detection process.

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Development of 500-kV XLPE cables and accessories for long-distance underground transmission lines. IV. Electrical properties of 500-kV extrusion molded joints

Cited by 14 publications

References 3 publications

MgO nanoparticles on the electrical properties of insulating materials for high voltage cable system

MgO nanoparticles on the electrical properties of insulating materials for high voltage cable system

Dielectric Characteristics of Crosslinked Polyethylene Modified by Grafting Polar-Group Molecules

Charge-Simulation-Based Electric Field Analysis and Electrical Tree Propagation Model with Defects in 10 kV XLPE Cable Joint

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