中国电机工程学报Issue(9)：1454-1461,8.DOI:10.13334/j.0258-8013.pcsee.2014.09.017
LDPE纳米复合介质的直流电导特性及其对高压直流电缆中电场分布的影响
DC Conductivity Characteristic of LDPE Nanocomposite and Its Effect on Electric Field Distribution in HVDC Cables
摘要
Abstract
The conductivity of polymeric solid dielectrics tends to be a strong function of temperature and electric field. In this paper, conductivity at different temperature and electric field for three kinds of materials, LDPE, MgO/LDPE, SiO2/LDPE was investigated. Based on the measurement results, a mathematical model was established to describe the conductivity as a function of temperature and electric field. According to the model, by using COMSOL analysis software, the electric field distribution in a 320 kV, 500 MW DC cable geometry was calculated. Experiments results revealed that, under the DC condition, the electric field distribution is conductivity-dependent. Conductivity changes caused by the temperature, which will lead to electric field distribution is temperature-dependent. Meanwhile, conductivity and electric field strength have a nonlinear relationship, which can stabilize the distortion of the electric field caused by the geometric structure or temperature gradient. Nanocomposites can decrease conductivity effectively. Interfacial electric charge in the boundary of the nano particles and the polymer matrix was suggested to be responsible for the improvement of electrical properties.关键词
高压直流电缆/纳米复合介质/电导率/场强系数/温度系数Key words
HVDC cable/nanocomposite/conductivity/electric field coefficient/temperature coefficient分类
信息技术与安全科学引用本文复制引用
杨佳明,王暄,韩宝忠,赵洪,徐明忠..LDPE纳米复合介质的直流电导特性及其对高压直流电缆中电场分布的影响[J].中国电机工程学报,2014,(9):1454-1461,8.基金项目
国家自然科学基金项目(51337002，50977019)。@@@@Project Supported by National Natural Science Foundation of China (51337002,50977019) （51337002，50977019）
