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Our significant contribution is to bring improvements to the level of existing formulations for the different layers of high-voltage underground cables using the concept of composite. This paper is focused on studying the impact of additives on the electric field behaviour in the different dielectric layers of a three-core XLPE power cable using Matlab software and a finite element approach in COMSOL Multiphysics software. This study is an extension of previous studies only interested in the insulating part of the cables. The reduction in the electric field with the augmentation of fillers was observed, and it’s very significant in insulating layers. In semiconducting layers, it also leads to an increase in the electric field in the insulation layers. While in the other dielectrics layers, there is no effect. The results indicate that the electric field strength could be controlled by adjusting the relative permittivity of the dielectrics by adding single or multiple particles. [ABSTRACT FROM AUTHOR]

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The resolution of the environment pollution depends on renewable energy sources, such as wind energy systems. These systems face transient and voltage stability issues with wind energy employing fixed-speed induction generators to be augmented with resistive type Superconducting Fault Current Limiter (SFCL) and Superconducting Magnetic Energy Storage (SMES) devices. The use of a combined model based on SFCL and SMES for promoting transient and voltage stability of a multi-machine power system considering the fixed-speed induction generators is the primary focus of this study. Our contribution is the development of a new model that combines the advantages of SFCL and SMES. The proposed model functions assure flexible control of reactive power using SMES controller while reducing fault current using superconducting technology-based SFCL. The effectiveness of the proposed combined model is tested on the IEEE11-bus test system applied to the case of a three-phase short circuit fault in one transmission line. [ABSTRACT FROM AUTHOR]

Polyvinyl chloride (PVC) is usually used as insulation in electrical engineering, mainly as cable insulation sheaths. A method for improving PVC's dielectric properties, reducing the effects of UV ageing, is the use of PVC films doped in alumina and titanium dioxide. This research investigated the influence of alumina and titanium dioxide (Al2O3/TiO2) to the dielectric properties of PVC. Four PVC samples were examined using an RLC impedance analyzer. Fourier Transform Infrared (FTIR) spectroscopy was utilized on the sample's surfaces, exploring the chemical stability of the tested materials. In addition, the volume resistivity and average breakdown voltage of each sample was examined. Doping Al2O3/TiO2 into PVC improved its dielectric properties and volume resistivity, while adding more ceramic decreased volume resistivity. Furthermore, the addition of Al2O3/TiO2 caused a significant enhancement in voltage breakdown strength. [ABSTRACT FROM AUTHOR]

Cross-Linked Polyethylene (XLPE) is widely used as insulation in electrical engineering, especially as cable insulation sheaths. In order to improve the dielectric properties susceptible to be modified under the effects of thermal aging and water in an absorption environment, polymers are mixed with ceramics. In this paper, the influence of barium titanate (BaTiO3), on the dielectric properties of XLPE has been studied. Dielectric parameters have been measured using an impedance analyzer RLC (WAYNE KERR 6420 type). Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy and X-ray diffraction were used as characterization techniques. The study has been carried out on two samples of XLPE. A pure sample of each were studied as a unloaded samples to be compared with samples of 5%wt, 10%wt, 15%wt and 20%wt. BaTiO3 loaded XLPE. Afterwards, the composites were subject to humidity and to thermal aging. The incorporation of BaTiO3 1C does not modify the crystallinity and morphology of the XLPE and 2C reduces the space charges therefore the dielectric losses. , and loss index are measured. Frequency response analysis has been followed in the frequency range (20-300 Hz). Experimental results show well that BaTiO3 as nano-filler improves the dielectric properties of XLPE but in excessive content can drive to the cracking and therefore to absorption of water. [ABSTRACT FROM AUTHOR]