The main purpose of this paper is to evaluate electrical tree degradation for cross-linked polyethylene (XLPE) cable insulation for three difference models. In order to show the distribution characteristics using phase resolved partial discharge (PD), we acquire data by using a PD detecting system. These acquired data presented four 2D distributions such as phase angle-average discharge distrib...

This study focused on the effect of pre-crosslinking electrical properties XLPE insulation for HVDC cables. The samples were pre-crosslinked at 140, 150 and 160 °C. space charge DC breakdown characteristics with without investigated. results show that have an obvious injection transportation, resulting in more severe electric field distortion. Under 100 kV/mm, distortion rates °C reached 51% 72...

Abstract Corrosion and breakages of shielding layers are one the factors for degradation extruded three‐layer (E‐E type) 6.6 kV cross‐linked polyethylene (XLPE) cables. Tohoku Electric Power Network has been measuring electrical resistances in E‐E type XLPE cables, recently found layers. The authors performed an accelerated test cables by taking account aqueous solution, temperature, heat cycle...

In order to extract the millivolt range partial discharge(PD) signals drown in the harsh electromagnetic interference for HV power cables, this paper presents a novel antiinterference method, based on fast fourier transform autothresholding method, 1-D discrete wavelet thresholding method and three phase amplitude and arrive-time difference method. This method is examined and proved to be effec...

HVDC cables are subject to several types of impulses superimposed on the rated DC voltage during their service lifetime. Temporary Overvoltages (TOVs) and Superimposed Switching (SSIs) considered some most challenging due relatively long impulse duration. This paper aims at investigating experimentally effect TOVs SSIs XLPE insulation for extruded cables. 0.15-mm-thick DC-XLPE specimens, aged b...

Power cables insulated with cross-linked polyethylene (XLPE) have been utilized worldwide for distribution and transmission networks. There are several advantages this type of insulation; it has better electrical, thermal, mechanical properties compared to other types insulation in medium high voltage Many studies aimed improve the XLPE characteristics through introducing nano fillers matrix. T...

The purpose of this work is to present and to discuss a methodology for the assessment of materials intended to HVDC-XLPE cables, particularly as regards the evaluation of the effects of material formulation on space charge accumulation within the insulation. Sample design, testing method and protocol and criteria used for the material evaluation are specifically considered. It will be shown th...