Dielectric and space charge characteristics of nano-modified liquid silicone rubber for high-voltage DC cable accessorie
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Dielectric and space charge characteristics of nano‑modified liquid silicone rubber for high‑voltage DC cable accessories Qingguo Chen1 · Banggen Xi1 · Jinfeng Zhang2 · Xinyu Wang1 · Hongda Yang1 Received: 4 July 2020 / Accepted: 11 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In order to solve the problem of space charge accumulation in high-voltage DC cable accessories, nanometer titanium dioxide (TiO2) doping method is used to improve the space charge performance of liquid silicone rubber (LSR). Conductivity, dielectric spectrum and DC breakdown field strength, space charge distribution, and the trap level distribution of nano-TiO2/ LSR composite samples were tested in this paper. With the increase of the doping concentration of nanoparticles, the DC iO2/LSR composite sample increased conductivity increased, and the DC breakdown field strength decreased. The εr of the T with the increase in the doping concentration of nano-TiO2. As the frequency increased, tanδ decreased first in the lowfrequency region and then increased in the high frequency. When the electric field strength increases from 10 to 20 kV/mm, the same polarity charges appear near the upper and lower electrodes of the sample, and the space charge accumulation doubled. After the addition of nano-TiO2, under the two electric field strengths, the space charge accumulation of 4 wt%-TiO2/ LSR composite materials decreased by 24.55 nc and 81.03 nc, respectively. The trap energy level of the 4 wt% nano-TiO2 composites becomes smaller, and shallow traps are introduced, it was verified that the addition of 4 wt% nano-TiO2 particles reduced the space charge inside the composite sample and achieved the effect of suppressing space charge.
1 Introduction Compared with traditional AC power transmission, HVDC power transmission is widely used in asynchronous grid connection and long-distance transmission across the sea due to many advantages, such as no increase in system shortcircuit capacity, fast power adjustment, high system stability, and low line loss. [1–3]. As the physical foundation and key equipment for constructing a DC grid, high-voltage DC cables are considered to be an important part of the smart grid and the future global energy Internet [4, 5]. Cable accessories are an essential part of the high-voltage DC cable system, and its insulation safety and reliability affect the entire transmission network [6]. Electrode * Banggen Xi [email protected] 1
Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, Heilongjiang, China
School of Electrical Engineering and Automation, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
2
injection and impurity ionization cause the space charge to easily accumulate inside the polymer insulation, which in turn causes local field strength distortion, insulation material aging, partial discharge, and even insulation breakdown [7]. Studie
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