Silicone Rubber Nonlinear Composites for HVDC Cable Terminals
孙略1, 张沛红1, 李中原1, 张瑞敏1, 傅明利2, 侯帅2
1. 哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080
2. 南方电网科学研究院有限责任公司,广州510080
SUN Lüe1, ZHANG Peihong1, LI Zhongyuan1, ZHANG Ruimin1, FU Mingli2, HOU Shuai2
1. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education of China, Harbin University of Science and Technology, Harbin 150080, China
2. Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China
The difference in conductivity between the reinforced insulation material and the cable main insulation material affects the electric field distribution in high-voltage direct current (HVDC) cable terminal. So, silicone rubber composites with conductivity nonlinearity were prepared by adding nano silicon carbide, nano-silica, nano-carbon black and nano-graphite to the silicone rubber. The effects of the types and contents of nanofiller on the DC conductance characteristics, DC breakdown characteristics and dielectric spectroscopy properties of the silicone rubber nonlinear composites were investigated experimentally. Under the influence of temperature, the electric field simulation was carried out by using COMSOL Multiphysics simulation software to analyze the influence of the nonlinear conductance characteristics of the reinforced insulation on the electric field distribution of the high-voltage direct current (HVDC) cable terminals. The results show that, when the silicon rubber composite material doped with graphite/carbon black (5/3)is used as the reinforced insulation of HVDC cable terminals, the electric field distribution of the HVDC cable terminals can effectively be improved.
KEY WORDS :silicone rubber;nano-SiC;nano-SiO2;nano-graphite;nano-carbon black;composites;nonlinear conductivity;HVDC cable terminal;electric field simulation;
图4
不同温度下,纳米SiC/硅橡胶复合材料电导率与 场强的关系
Fig.4
Relationship between conductivity and electric field strength of nano-SiC/SR composites at different temperature
图5
不同温度下,纳米SiO2/硅橡胶复合物电导率与 场强的关系
Fig.5
Relationship between conductivity and electric field strength of nano-SiO2/SR composites at different temperature
图6
不同温度下,纳米石墨摻杂量为5时,不同纳米CB掺杂量的硅橡胶复合物电导率与场强的关系
Fig.6
Based on the nano-graphite doping amount of 5, the relationship between the electrical conductivity and field strength of different nano-CB doping silicone rubber composites at different temperatures
图7
不同温度下,纳米CB掺杂量为5时,不同纳米石墨掺杂量的硅橡胶复合物电导率与场强的关系
Fig.7
Relationship between the electrical conductivity and field strength of different nano-graphite doped silicon rubber composites at different temperatures based on the nano CB doping amount of 5
图10
失效概率为63.2%时,纳米石墨/纳米炭黑/硅橡胶复合材料直流击穿场强
Fig.10
DC breakdown strength of different contents of nano-graphite /nano-CB/SRcomposites at failure F(x)=63.2%
表2
硅橡胶复合材料在频率为8.3×105 Hz时的相对介电常数
Table
2 Relative permittivity of SR composites in the frequency of 8.3×105 Hz
图11
硅橡胶复合材料相对介电常数随频率变化曲线
Fig.11
Relationship between relative permittivity and frequency of SR composites
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